overview changedapi/overview
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4747| `Authorization` | `Bearer <token>`, where `<token>` is your API key or a short-lived access token obtained from `POST /v1/oauth/token` through [Workload Identity Federation](https://platform.claude.com/docs/en/manage-claude/workload-identity-federation) | Yes, unless `x-api-key` is set |
4848| `x-api-key` | Your API key from Console. Legacy fallback for `Authorization`, still supported | No |
4949| `anthropic-workspace-id` | ID of the [workspace](https://platform.claude.com/docs/en/manage-claude/workspaces) the request runs in (for example, `wrkspc_01JwQvzr7rXLA5AGx3HKfFUJ`). See [Select a workspace](https://platform.claude.com/docs/en/manage-claude/authentication#select-a-workspace). | Required with a multi-workspace API key. Optional for other API keys. A key created for a single workspace runs in that workspace when you omit the header. Not used with Workload Identity Federation tokens, which select a workspace at token exchange. |
50| `anthropic-version` | API version (for example, `2023-06-01`) | Yes |
50| `anthropic-version` | API version (for example, `2026-10-21`) | Yes |
5151| `content-type` | `application/json` | Yes |
5252
5353If you are using the [Client SDKs](https://platform.claude.com/docs/en/api/overview#client-sdks), the SDK sends the authentication, version, and content-type headers automatically; you pass `anthropic-workspace-id` yourself when your key needs it. For API versioning details, see [API versions](https://platform.claude.com/docs/en/api/versioning).
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