API Coverage
Full coverage status of the Anthropic Messages API.
Messages API (/v1/messages)
| Parameter | Status |
|---|---|
| model | Supported |
| max_tokens | Supported |
| messages | Supported |
| system | Supported |
| temperature | Supported |
| top_p | Supported |
| top_k | Supported |
| stop_sequences | Supported |
| tools | Supported |
| tool_choice | Supported |
| stream | Supported |
| thinking | Supported |
| output_config | Supported |
| metadata | Supported |
| service_tier | Supported |
Content Block Types
| Type | Status |
|---|---|
| text | Supported |
| image (base64) | Supported |
| image (URL) | Supported |
| document | Supported |
| tool_use | Supported |
| tool_result | Supported |
| thinking | Supported |
| redacted_thinking | Supported |
Tool Types
| Type | Status |
|---|---|
| Custom tools | Supported |
| web_search | Supported |
| code_execution | Supported |
| text_editor | Supported |
| bash | Supported |
Streaming Events
All 8 SSE event types are supported:
| Event | Status |
|---|---|
| message_start | Supported |
| content_block_start | Supported |
| content_block_delta | Supported |
| content_block_stop | Supported |
| message_delta | Supported |
| message_stop | Supported |
| ping | Supported |
| error | Supported |
Error Handling
| Method | Description |
|---|---|
IsInvalidRequest() | 400 — bad request |
IsAuthentication() | 401 — invalid token |
IsPermission() | 403 — no permission |
IsNotFound() | 404 — not found |
IsRateLimit() | 429 — rate limited |
IsOverloaded() | 529 — server overloaded |
Not Yet Implemented
| Feature | Priority |
|---|---|
| Message Batches | Next |
| Retry with backoff | Next |
| Admin API | Low |
| Models API | Low |