diff --git a/packages/opencode/migration/20260228114647_add_session_cost/migration.sql b/packages/opencode/migration/20260228114647_add_session_cost/migration.sql
new file mode 100644
index 000000000000..c1c560e51e57
--- /dev/null
+++ b/packages/opencode/migration/20260228114647_add_session_cost/migration.sql
@@ -0,0 +1 @@
+ALTER TABLE `session` ADD `cost` real;
\ No newline at end of file
diff --git a/packages/opencode/migration/20260228114647_add_session_cost/snapshot.json b/packages/opencode/migration/20260228114647_add_session_cost/snapshot.json
new file mode 100644
index 000000000000..651ebd512245
--- /dev/null
+++ b/packages/opencode/migration/20260228114647_add_session_cost/snapshot.json
@@ -0,0 +1,1019 @@
+{
+  "version": "7",
+  "dialect": "sqlite",
+  "id": "b9928162-0e4a-4280-b809-0b5d5c4a4172",
+  "prevIds": [
+    "1f1dbf2d-bf66-4b25-8af4-4ba7633b7e40"
+  ],
+  "ddl": [
+    {
+      "name": "workspace",
+      "entityType": "tables"
+    },
+    {
+      "name": "control_account",
+      "entityType": "tables"
+    },
+    {
+      "name": "project",
+      "entityType": "tables"
+    },
+    {
+      "name": "message",
+      "entityType": "tables"
+    },
+    {
+      "name": "part",
+      "entityType": "tables"
+    },
+    {
+      "name": "permission",
+      "entityType": "tables"
+    },
+    {
+      "name": "session",
+      "entityType": "tables"
+    },
+    {
+      "name": "todo",
+      "entityType": "tables"
+    },
+    {
+      "name": "session_share",
+      "entityType": "tables"
+    },
+    {
+      "type": "text",
+      "notNull": false,
+      "autoincrement": false,
+      "default": null,
+      "generated": null,
+      "name": "id",
+      "entityType": "columns",
+      "table": "workspace"
+    },
+    {
+      "type": "text",
+      "notNull": false,
+      "autoincrement": false,
+      "default": null,
+      "generated": null,
+      "name": "branch",
+      "entityType": "columns",
+      "table": "workspace"
+    },
+    {
+      "type": "text",
+      "notNull": true,
+      "autoincrement": false,
+      "default": null,
+      "generated": null,
+      "name": "project_id",
+      "entityType": "columns",
+      "table": "workspace"
+    },
+    {
+      "type": "text",
+      "notNull": true,
+      "autoincrement": false,
+      "default": null,
+      "generated": null,
+      "name": "config",
+      "entityType": "columns",
+      "table": "workspace"
+    },
+    {
+      "type": "text",
+      "notNull": true,
+      "autoincrement": false,
+      "default": null,
+      "generated": null,
+      "name": "email",
+      "entityType": "columns",
+      "table": "control_account"
+    },
+    {
+      "type": "text",
+      "notNull": true,
+      "autoincrement": false,
+      "default": null,
+      "generated": null,
+      "name": "url",
+      "entityType": "columns",
+      "table": "control_account"
+    },
+    {
+      "type": "text",
+      "notNull": true,
+      "autoincrement": false,
+      "default": null,
+      "generated": null,
+      "name": "access_token",
+      "entityType": "columns",
+      "table": "control_account"
+    },
+    {
+      "type": "text",
+      "notNull": true,
+      "autoincrement": false,
+      "default": null,
+      "generated": null,
+      "name": "refresh_token",
+      "entityType": "columns",
+      "table": "control_account"
+    },
+    {
+      "type": "integer",
+      "notNull": false,
+      "autoincrement": false,
+      "default": null,
+      "generated": null,
+      "name": "token_expiry",
+      "entityType": "columns",
+      "table": "control_account"
+    },
+    {
+      "type": "integer",
+      "notNull": true,
+      "autoincrement": false,
+      "default": null,
+      "generated": null,
+      "name": "active",
+      "entityType": "columns",
+      "table": "control_account"
+    },
+    {
+      "type": "integer",
+      "notNull": true,
+      "autoincrement": false,
+      "default": null,
+      "generated": null,
+      "name": "time_created",
+      "entityType": "columns",
+      "table": "control_account"
+    },
+    {
+      "type": "integer",
+      "notNull": true,
+      "autoincrement": false,
+      "default": null,
+      "generated": null,
+      "name": "time_updated",
+      "entityType": "columns",
+      "table": "control_account"
+    },
+    {
+      "type": "text",
+      "notNull": false,
+      "autoincrement": false,
+      "default": null,
+      "generated": null,
+      "name": "id",
+      "entityType": "columns",
+      "table": "project"
+    },
+    {
+      "type": "text",
+      "notNull": true,
+      "autoincrement": false,
+      "default": null,
+      "generated": null,
+      "name": "worktree",
+      "entityType": "columns",
+      "table": "project"
+    },
+    {
+      "type": "text",
+      "notNull": false,
+      "autoincrement": false,
+      "default": null,
+      "generated": null,
+      "name": "vcs",
+      "entityType": "columns",
+      "table": "project"
+    },
+    {
+      "type": "text",
+      "notNull": false,
+      "autoincrement": false,
+      "default": null,
+      "generated": null,
+      "name": "name",
+      "entityType": "columns",
+      "table": "project"
+    },
+    {
+      "type": "text",
+      "notNull": false,
+      "autoincrement": false,
+      "default": null,
+      "generated": null,
+      "name": "icon_url",
+      "entityType": "columns",
+      "table": "project"
+    },
+    {
+      "type": "text",
+      "notNull": false,
+      "autoincrement": false,
+      "default": null,
+      "generated": null,
+      "name": "icon_color",
+      "entityType": "columns",
+      "table": "project"
+    },
+    {
+      "type": "integer",
+      "notNull": true,
+      "autoincrement": false,
+      "default": null,
+      "generated": null,
+      "name": "time_created",
+      "entityType": "columns",
+      "table": "project"
+    },
+    {
+      "type": "integer",
+      "notNull": true,
+      "autoincrement": false,
+      "default": null,
+      "generated": null,
+      "name": "time_updated",
+      "entityType": "columns",
+      "table": "project"
+    },
+    {
+      "type": "integer",
+      "notNull": false,
+      "autoincrement": false,
+      "default": null,
+      "generated": null,
+      "name": "time_initialized",
+      "entityType": "columns",
+      "table": "project"
+    },
+    {
+      "type": "text",
+      "notNull": true,
+      "autoincrement": false,
+      "default": null,
+      "generated": null,
+      "name": "sandboxes",
+      "entityType": "columns",
+      "table": "project"
+    },
+    {
+      "type": "text",
+      "notNull": false,
+      "autoincrement": false,
+      "default": null,
+      "generated": null,
+      "name": "commands",
+      "entityType": "columns",
+      "table": "project"
+    },
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+      "name": "id",
+      "entityType": "columns",
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+    },
+    {
+      "type": "text",
+      "notNull": true,
+      "autoincrement": false,
+      "default": null,
+      "generated": null,
+      "name": "session_id",
+      "entityType": "columns",
+      "table": "message"
+    },
+    {
+      "type": "integer",
+      "notNull": true,
+      "autoincrement": false,
+      "default": null,
+      "generated": null,
+      "name": "time_created",
+      "entityType": "columns",
+      "table": "message"
+    },
+    {
+      "type": "integer",
+      "notNull": true,
+      "autoincrement": false,
+      "default": null,
+      "generated": null,
+      "name": "time_updated",
+      "entityType": "columns",
+      "table": "message"
+    },
+    {
+      "type": "text",
+      "notNull": true,
+      "autoincrement": false,
+      "default": null,
+      "generated": null,
+      "name": "data",
+      "entityType": "columns",
+      "table": "message"
+    },
+    {
+      "type": "text",
+      "notNull": false,
+      "autoincrement": false,
+      "default": null,
+      "generated": null,
+      "name": "id",
+      "entityType": "columns",
+      "table": "part"
+    },
+    {
+      "type": "text",
+      "notNull": true,
+      "autoincrement": false,
+      "default": null,
+      "generated": null,
+      "name": "message_id",
+      "entityType": "columns",
+      "table": "part"
+    },
+    {
+      "type": "text",
+      "notNull": true,
+      "autoincrement": false,
+      "default": null,
+      "generated": null,
+      "name": "session_id",
+      "entityType": "columns",
+      "table": "part"
+    },
+    {
+      "type": "integer",
+      "notNull": true,
+      "autoincrement": false,
+      "default": null,
+      "generated": null,
+      "name": "time_created",
+      "entityType": "columns",
+      "table": "part"
+    },
+    {
+      "type": "integer",
+      "notNull": true,
+      "autoincrement": false,
+      "default": null,
+      "generated": null,
+      "name": "time_updated",
+      "entityType": "columns",
+      "table": "part"
+    },
+    {
+      "type": "text",
+      "notNull": true,
+      "autoincrement": false,
+      "default": null,
+      "generated": null,
+      "name": "data",
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+      "table": "part"
+    },
+    {
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+      "autoincrement": false,
+      "default": null,
+      "generated": null,
+      "name": "project_id",
+      "entityType": "columns",
+      "table": "permission"
+    },
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+      "autoincrement": false,
+      "default": null,
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+      "name": "time_created",
+      "entityType": "columns",
+      "table": "permission"
+    },
+    {
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+      "notNull": true,
+      "autoincrement": false,
+      "default": null,
+      "generated": null,
+      "name": "time_updated",
+      "entityType": "columns",
+      "table": "permission"
+    },
+    {
+      "type": "text",
+      "notNull": true,
+      "autoincrement": false,
+      "default": null,
+      "generated": null,
+      "name": "data",
+      "entityType": "columns",
+      "table": "permission"
+    },
+    {
+      "type": "text",
+      "notNull": false,
+      "autoincrement": false,
+      "default": null,
+      "generated": null,
+      "name": "id",
+      "entityType": "columns",
+      "table": "session"
+    },
+    {
+      "type": "text",
+      "notNull": true,
+      "autoincrement": false,
+      "default": null,
+      "generated": null,
+      "name": "project_id",
+      "entityType": "columns",
+      "table": "session"
+    },
+    {
+      "type": "text",
+      "notNull": false,
+      "autoincrement": false,
+      "default": null,
+      "generated": null,
+      "name": "parent_id",
+      "entityType": "columns",
+      "table": "session"
+    },
+    {
+      "type": "text",
+      "notNull": true,
+      "autoincrement": false,
+      "default": null,
+      "generated": null,
+      "name": "slug",
+      "entityType": "columns",
+      "table": "session"
+    },
+    {
+      "type": "text",
+      "notNull": true,
+      "autoincrement": false,
+      "default": null,
+      "generated": null,
+      "name": "directory",
+      "entityType": "columns",
+      "table": "session"
+    },
+    {
+      "type": "text",
+      "notNull": true,
+      "autoincrement": false,
+      "default": null,
+      "generated": null,
+      "name": "title",
+      "entityType": "columns",
+      "table": "session"
+    },
+    {
+      "type": "text",
+      "notNull": true,
+      "autoincrement": false,
+      "default": null,
+      "generated": null,
+      "name": "version",
+      "entityType": "columns",
+      "table": "session"
+    },
+    {
+      "type": "text",
+      "notNull": false,
+      "autoincrement": false,
+      "default": null,
+      "generated": null,
+      "name": "share_url",
+      "entityType": "columns",
+      "table": "session"
+    },
+    {
+      "type": "integer",
+      "notNull": false,
+      "autoincrement": false,
+      "default": null,
+      "generated": null,
+      "name": "summary_additions",
+      "entityType": "columns",
+      "table": "session"
+    },
+    {
+      "type": "integer",
+      "notNull": false,
+      "autoincrement": false,
+      "default": null,
+      "generated": null,
+      "name": "summary_deletions",
+      "entityType": "columns",
+      "table": "session"
+    },
+    {
+      "type": "integer",
+      "notNull": false,
+      "autoincrement": false,
+      "default": null,
+      "generated": null,
+      "name": "summary_files",
+      "entityType": "columns",
+      "table": "session"
+    },
+    {
+      "type": "text",
+      "notNull": false,
+      "autoincrement": false,
+      "default": null,
+      "generated": null,
+      "name": "summary_diffs",
+      "entityType": "columns",
+      "table": "session"
+    },
+    {
+      "type": "text",
+      "notNull": false,
+      "autoincrement": false,
+      "default": null,
+      "generated": null,
+      "name": "revert",
+      "entityType": "columns",
+      "table": "session"
+    },
+    {
+      "type": "text",
+      "notNull": false,
+      "autoincrement": false,
+      "default": null,
+      "generated": null,
+      "name": "permission",
+      "entityType": "columns",
+      "table": "session"
+    },
+    {
+      "type": "real",
+      "notNull": false,
+      "autoincrement": false,
+      "default": null,
+      "generated": null,
+      "name": "cost",
+      "entityType": "columns",
+      "table": "session"
+    },
+    {
+      "type": "integer",
+      "notNull": true,
+      "autoincrement": false,
+      "default": null,
+      "generated": null,
+      "name": "time_created",
+      "entityType": "columns",
+      "table": "session"
+    },
+    {
+      "type": "integer",
+      "notNull": true,
+      "autoincrement": false,
+      "default": null,
+      "generated": null,
+      "name": "time_updated",
+      "entityType": "columns",
+      "table": "session"
+    },
+    {
+      "type": "integer",
+      "notNull": false,
+      "autoincrement": false,
+      "default": null,
+      "generated": null,
+      "name": "time_compacting",
+      "entityType": "columns",
+      "table": "session"
+    },
+    {
+      "type": "integer",
+      "notNull": false,
+      "autoincrement": false,
+      "default": null,
+      "generated": null,
+      "name": "time_archived",
+      "entityType": "columns",
+      "table": "session"
+    },
+    {
+      "type": "text",
+      "notNull": true,
+      "autoincrement": false,
+      "default": null,
+      "generated": null,
+      "name": "session_id",
+      "entityType": "columns",
+      "table": "todo"
+    },
+    {
+      "type": "text",
+      "notNull": true,
+      "autoincrement": false,
+      "default": null,
+      "generated": null,
+      "name": "content",
+      "entityType": "columns",
+      "table": "todo"
+    },
+    {
+      "type": "text",
+      "notNull": true,
+      "autoincrement": false,
+      "default": null,
+      "generated": null,
+      "name": "status",
+      "entityType": "columns",
+      "table": "todo"
+    },
+    {
+      "type": "text",
+      "notNull": true,
+      "autoincrement": false,
+      "default": null,
+      "generated": null,
+      "name": "priority",
+      "entityType": "columns",
+      "table": "todo"
+    },
+    {
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+      "notNull": true,
+      "autoincrement": false,
+      "default": null,
+      "generated": null,
+      "name": "position",
+      "entityType": "columns",
+      "table": "todo"
+    },
+    {
+      "type": "integer",
+      "notNull": true,
+      "autoincrement": false,
+      "default": null,
+      "generated": null,
+      "name": "time_created",
+      "entityType": "columns",
+      "table": "todo"
+    },
+    {
+      "type": "integer",
+      "notNull": true,
+      "autoincrement": false,
+      "default": null,
+      "generated": null,
+      "name": "time_updated",
+      "entityType": "columns",
+      "table": "todo"
+    },
+    {
+      "type": "text",
+      "notNull": false,
+      "autoincrement": false,
+      "default": null,
+      "generated": null,
+      "name": "session_id",
+      "entityType": "columns",
+      "table": "session_share"
+    },
+    {
+      "type": "text",
+      "notNull": true,
+      "autoincrement": false,
+      "default": null,
+      "generated": null,
+      "name": "id",
+      "entityType": "columns",
+      "table": "session_share"
+    },
+    {
+      "type": "text",
+      "notNull": true,
+      "autoincrement": false,
+      "default": null,
+      "generated": null,
+      "name": "secret",
+      "entityType": "columns",
+      "table": "session_share"
+    },
+    {
+      "type": "text",
+      "notNull": true,
+      "autoincrement": false,
+      "default": null,
+      "generated": null,
+      "name": "url",
+      "entityType": "columns",
+      "table": "session_share"
+    },
+    {
+      "type": "integer",
+      "notNull": true,
+      "autoincrement": false,
+      "default": null,
+      "generated": null,
+      "name": "time_created",
+      "entityType": "columns",
+      "table": "session_share"
+    },
+    {
+      "type": "integer",
+      "notNull": true,
+      "autoincrement": false,
+      "default": null,
+      "generated": null,
+      "name": "time_updated",
+      "entityType": "columns",
+      "table": "session_share"
+    },
+    {
+      "columns": [
+        "project_id"
+      ],
+      "tableTo": "project",
+      "columnsTo": [
+        "id"
+      ],
+      "onUpdate": "NO ACTION",
+      "onDelete": "CASCADE",
+      "nameExplicit": false,
+      "name": "fk_workspace_project_id_project_id_fk",
+      "entityType": "fks",
+      "table": "workspace"
+    },
+    {
+      "columns": [
+        "session_id"
+      ],
+      "tableTo": "session",
+      "columnsTo": [
+        "id"
+      ],
+      "onUpdate": "NO ACTION",
+      "onDelete": "CASCADE",
+      "nameExplicit": false,
+      "name": "fk_message_session_id_session_id_fk",
+      "entityType": "fks",
+      "table": "message"
+    },
+    {
+      "columns": [
+        "message_id"
+      ],
+      "tableTo": "message",
+      "columnsTo": [
+        "id"
+      ],
+      "onUpdate": "NO ACTION",
+      "onDelete": "CASCADE",
+      "nameExplicit": false,
+      "name": "fk_part_message_id_message_id_fk",
+      "entityType": "fks",
+      "table": "part"
+    },
+    {
+      "columns": [
+        "project_id"
+      ],
+      "tableTo": "project",
+      "columnsTo": [
+        "id"
+      ],
+      "onUpdate": "NO ACTION",
+      "onDelete": "CASCADE",
+      "nameExplicit": false,
+      "name": "fk_permission_project_id_project_id_fk",
+      "entityType": "fks",
+      "table": "permission"
+    },
+    {
+      "columns": [
+        "project_id"
+      ],
+      "tableTo": "project",
+      "columnsTo": [
+        "id"
+      ],
+      "onUpdate": "NO ACTION",
+      "onDelete": "CASCADE",
+      "nameExplicit": false,
+      "name": "fk_session_project_id_project_id_fk",
+      "entityType": "fks",
+      "table": "session"
+    },
+    {
+      "columns": [
+        "session_id"
+      ],
+      "tableTo": "session",
+      "columnsTo": [
+        "id"
+      ],
+      "onUpdate": "NO ACTION",
+      "onDelete": "CASCADE",
+      "nameExplicit": false,
+      "name": "fk_todo_session_id_session_id_fk",
+      "entityType": "fks",
+      "table": "todo"
+    },
+    {
+      "columns": [
+        "session_id"
+      ],
+      "tableTo": "session",
+      "columnsTo": [
+        "id"
+      ],
+      "onUpdate": "NO ACTION",
+      "onDelete": "CASCADE",
+      "nameExplicit": false,
+      "name": "fk_session_share_session_id_session_id_fk",
+      "entityType": "fks",
+      "table": "session_share"
+    },
+    {
+      "columns": [
+        "email",
+        "url"
+      ],
+      "nameExplicit": false,
+      "name": "control_account_pk",
+      "entityType": "pks",
+      "table": "control_account"
+    },
+    {
+      "columns": [
+        "session_id",
+        "position"
+      ],
+      "nameExplicit": false,
+      "name": "todo_pk",
+      "entityType": "pks",
+      "table": "todo"
+    },
+    {
+      "columns": [
+        "id"
+      ],
+      "nameExplicit": false,
+      "name": "workspace_pk",
+      "table": "workspace",
+      "entityType": "pks"
+    },
+    {
+      "columns": [
+        "id"
+      ],
+      "nameExplicit": false,
+      "name": "project_pk",
+      "table": "project",
+      "entityType": "pks"
+    },
+    {
+      "columns": [
+        "id"
+      ],
+      "nameExplicit": false,
+      "name": "message_pk",
+      "table": "message",
+      "entityType": "pks"
+    },
+    {
+      "columns": [
+        "id"
+      ],
+      "nameExplicit": false,
+      "name": "part_pk",
+      "table": "part",
+      "entityType": "pks"
+    },
+    {
+      "columns": [
+        "project_id"
+      ],
+      "nameExplicit": false,
+      "name": "permission_pk",
+      "table": "permission",
+      "entityType": "pks"
+    },
+    {
+      "columns": [
+        "id"
+      ],
+      "nameExplicit": false,
+      "name": "session_pk",
+      "table": "session",
+      "entityType": "pks"
+    },
+    {
+      "columns": [
+        "session_id"
+      ],
+      "nameExplicit": false,
+      "name": "session_share_pk",
+      "table": "session_share",
+      "entityType": "pks"
+    },
+    {
+      "columns": [
+        {
+          "value": "session_id",
+          "isExpression": false
+        }
+      ],
+      "isUnique": false,
+      "where": null,
+      "origin": "manual",
+      "name": "message_session_idx",
+      "entityType": "indexes",
+      "table": "message"
+    },
+    {
+      "columns": [
+        {
+          "value": "message_id",
+          "isExpression": false
+        }
+      ],
+      "isUnique": false,
+      "where": null,
+      "origin": "manual",
+      "name": "part_message_idx",
+      "entityType": "indexes",
+      "table": "part"
+    },
+    {
+      "columns": [
+        {
+          "value": "session_id",
+          "isExpression": false
+        }
+      ],
+      "isUnique": false,
+      "where": null,
+      "origin": "manual",
+      "name": "part_session_idx",
+      "entityType": "indexes",
+      "table": "part"
+    },
+    {
+      "columns": [
+        {
+          "value": "project_id",
+          "isExpression": false
+        }
+      ],
+      "isUnique": false,
+      "where": null,
+      "origin": "manual",
+      "name": "session_project_idx",
+      "entityType": "indexes",
+      "table": "session"
+    },
+    {
+      "columns": [
+        {
+          "value": "parent_id",
+          "isExpression": false
+        }
+      ],
+      "isUnique": false,
+      "where": null,
+      "origin": "manual",
+      "name": "session_parent_idx",
+      "entityType": "indexes",
+      "table": "session"
+    },
+    {
+      "columns": [
+        {
+          "value": "session_id",
+          "isExpression": false
+        }
+      ],
+      "isUnique": false,
+      "where": null,
+      "origin": "manual",
+      "name": "todo_session_idx",
+      "entityType": "indexes",
+      "table": "todo"
+    }
+  ],
+  "renames": []
+}
\ No newline at end of file
diff --git a/packages/opencode/src/cli/cmd/tui/routes/session/sidebar.tsx b/packages/opencode/src/cli/cmd/tui/routes/session/sidebar.tsx
index 42ac5fbe080a..48103add0a3c 100644
--- a/packages/opencode/src/cli/cmd/tui/routes/session/sidebar.tsx
+++ b/packages/opencode/src/cli/cmd/tui/routes/session/sidebar.tsx
@@ -41,7 +41,7 @@ export function Sidebar(props: { sessionID: string; overlay?: boolean }) {
   )
 
   const cost = createMemo(() => {
-    const total = messages().reduce((sum, x) => sum + (x.role === "assistant" ? x.cost : 0), 0)
+    const total = session().cost ?? messages().reduce((sum, x) => sum + (x.role === "assistant" ? x.cost : 0), 0)
     return new Intl.NumberFormat("en-US", {
       style: "currency",
       currency: "USD",
diff --git a/packages/opencode/src/session/index.ts b/packages/opencode/src/session/index.ts
index 22de477f8d18..5c80d6835dda 100644
--- a/packages/opencode/src/session/index.ts
+++ b/packages/opencode/src/session/index.ts
@@ -71,6 +71,7 @@ export namespace Session {
       share,
       revert,
       permission: row.permission ?? undefined,
+      cost: row.cost ?? undefined,
       time: {
         created: row.time_created,
         updated: row.time_updated,
@@ -96,6 +97,7 @@ export namespace Session {
       summary_diffs: info.summary?.diffs,
       revert: info.revert ?? null,
       permission: info.permission,
+      cost: info.cost,
       time_created: info.time.created,
       time_updated: info.time.updated,
       time_compacting: info.time.compacting,
@@ -135,6 +137,7 @@ export namespace Session {
         .optional(),
       title: z.string(),
       version: z.string(),
+      cost: z.number().optional(),
       time: z.object({
         created: z.number(),
         updated: z.number(),
@@ -299,6 +302,7 @@ export namespace Session {
       directory: input.directory,
       parentID: input.parentID,
       title: input.title ?? createDefaultTitle(!!input.parentID),
+      cost: 0,
       permission: input.permission,
       time: {
         created: Date.now(),
@@ -338,6 +342,13 @@ export namespace Session {
     return fromRow(row)
   })
 
+  export const getCost = fn(Identifier.schema("session"), async (id) => {
+    const row = Database.use((db) =>
+      db.select({ cost: SessionTable.cost }).from(SessionTable).where(eq(SessionTable.id, id)).get(),
+    )
+    return row?.cost
+  })
+
   export const share = fn(Identifier.schema("session"), async (id) => {
     const cfg = await Config.get()
     if (cfg.share === "disabled") {
@@ -501,6 +512,22 @@ export namespace Session {
     },
   )
 
+  export function addCost(sessionID: string, amount: number) {
+    if (amount === 0) return
+    Database.effect(() => {
+      const row = Database.use((db) =>
+        db.select({ cost: SessionTable.cost }).from(SessionTable).where(eq(SessionTable.id, sessionID)).get(),
+      )
+      Database.use((db) =>
+        db
+          .update(SessionTable)
+          .set({ cost: (row?.cost ?? 0) + amount })
+          .where(eq(SessionTable.id, sessionID))
+          .run(),
+      )
+    })
+  }
+
   export const diff = fn(Identifier.schema("session"), async (sessionID) => {
     try {
       return await Storage.read<Snapshot.FileDiff[]>(["session_diff", sessionID])
diff --git a/packages/opencode/src/session/processor.ts b/packages/opencode/src/session/processor.ts
index e7532d20073b..14d99b5f5136 100644
--- a/packages/opencode/src/session/processor.ts
+++ b/packages/opencode/src/session/processor.ts
@@ -261,6 +261,7 @@ export namespace SessionProcessor {
                     cost: usage.cost,
                   })
                   await Session.updateMessage(input.assistantMessage)
+                  Session.addCost(input.sessionID, usage.cost)
                   if (snapshot) {
                     const patch = await Snapshot.patch(snapshot)
                     if (patch.files.length) {
diff --git a/packages/opencode/src/session/session.sql.ts b/packages/opencode/src/session/session.sql.ts
index 9c5c72c4c578..faab1793d2d2 100644
--- a/packages/opencode/src/session/session.sql.ts
+++ b/packages/opencode/src/session/session.sql.ts
@@ -1,4 +1,4 @@
-import { sqliteTable, text, integer, index, primaryKey } from "drizzle-orm/sqlite-core"
+import { sqliteTable, text, integer, real, index, primaryKey } from "drizzle-orm/sqlite-core"
 import { ProjectTable } from "../project/project.sql"
 import type { MessageV2 } from "./message-v2"
 import type { Snapshot } from "@/snapshot"
@@ -27,6 +27,7 @@ export const SessionTable = sqliteTable(
     summary_diffs: text({ mode: "json" }).$type<Snapshot.FileDiff[]>(),
     revert: text({ mode: "json" }).$type<{ messageID: string; partID?: string; snapshot?: string; diff?: string }>(),
     permission: text({ mode: "json" }).$type<PermissionNext.Ruleset>(),
+    cost: real(),
     ...Timestamps,
     time_compacting: integer(),
     time_archived: integer(),
diff --git a/packages/sdk/js/src/v2/gen/types.gen.ts b/packages/sdk/js/src/v2/gen/types.gen.ts
index 385de2cc85e3..ec6222e32387 100644
--- a/packages/sdk/js/src/v2/gen/types.gen.ts
+++ b/packages/sdk/js/src/v2/gen/types.gen.ts
@@ -821,6 +821,7 @@ export type Session = {
   }
   title: string
   version: string
+  cost?: number
   time: {
     created: number
     updated: number
@@ -1684,6 +1685,7 @@ export type GlobalSession = {
   }
   title: string
   version: string
+  cost?: number
   time: {
     created: number
     updated: number
diff --git a/packages/sdk/openapi.json b/packages/sdk/openapi.json
index 8632baf2d321..fd94d3f2d4c8 100644
--- a/packages/sdk/openapi.json
+++ b/packages/sdk/openapi.json
@@ -8417,6 +8417,9 @@
           "version": {
             "type": "string"
           },
+          "cost": {
+            "type": "number"
+          },
           "time": {
             "type": "object",
             "properties": {
@@ -10479,6 +10482,9 @@
           "version": {
             "type": "string"
           },
+          "cost": {
+            "type": "number"
+          },
           "time": {
             "type": "object",
             "properties": {