# Anthropic Claude 1.3 — deprecation status

> Yes — Claude 1.3 is retired. Anthropic deprecated it on September 4, 2024 and shut it down on November 6, 2024; API requests to it now fail. The recommended replacement is Claude Haiku 4.5.

The last and most capable Claude 1, and the version most benchmark papers from 2023 actually measured. It was superseded by Claude 2 within a few months but stayed callable for over a year afterwards.

## Facts

| Field | Value |
| --- | --- |
| Provider | Anthropic |
| Model id | `claude-1.3` |
| Status | Retired |
| Deprecated | September 4, 2024 |
| Shutdown | November 6, 2024 (631 days ago) |
| Last verified | July 30, 2026 |

## Replacement

- **Claude Haiku 4.5** (`claude-haiku-4-5-20251001`) · recommended — https://modeldeprecations.dev/anthropic/claude-haiku-4-5-20251001
  - Two generations and a whole API separate these. Claude 1 predates the Messages API, so a migration means moving off /v1/complete and its "\n\nHuman:"/"\n\nAssistant:" prompt format entirely.
  - Parameters it accepts: https://modelparams.dev/models/anthropic/claude-haiku-4-5-20251001

```diff
- "model": "claude-1.3"
+ "model": "claude-haiku-4-5-20251001"
```

## FAQ

### When did Anthropic Claude 1.3 shut down?

Anthropic Claude 1.3 shut down on November 6, 2024. API requests to it fail from that date onward.

### What replaces Anthropic Claude 1.3?

Anthropic recommends Claude Haiku 4.5 (`claude-haiku-4-5-20251001`) as the replacement for Anthropic Claude 1.3. Two generations and a whole API separate these. Claude 1 predates the Messages API, so a migration means moving off /v1/complete and its "\n\nHuman:"/"\n\nAssistant:" prompt format entirely.

### Is Anthropic Claude 1.3 still available?

No. Anthropic Claude 1.3 is retired and no longer served — it was shut down on November 6, 2024. Calls to it return an error.

### How do I migrate from Anthropic Claude 1.3 to claude-haiku-4-5-20251001?

Swap the model id in your API call: replace "claude-1.3" with "claude-haiku-4-5-20251001". Two generations and a whole API separate these. Claude 1 predates the Messages API, so a migration means moving off /v1/complete and its "\n\nHuman:"/"\n\nAssistant:" prompt format entirely.

## Sources

- [Anthropic model deprecations](https://platform.claude.com/docs/en/about-claude/model-deprecations) — accessed 2026-07-30

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Canonical page: https://modeldeprecations.dev/anthropic/claude-1.3
JSON: https://modeldeprecations.dev/api/v1/models/anthropic/claude-1.3.json