# Anthropic Claude 2.1 — deprecation status

> Yes — Claude 2.1 is retired. Anthropic deprecated it on January 21, 2025 and shut it down on July 21, 2025; API requests to it now fail. The recommended replacement is Claude Opus 4.8.

The model that took Claude to a 200k context window in late 2023, when the rest of the field was at 8k to 32k. Long context was Anthropic's clearest differentiator for most of a year. Retired July 2025.

## Facts

| Field | Value |
| --- | --- |
| Provider | Anthropic |
| Model id | `claude-2.1` |
| Status | Retired |
| Released | November 21, 2023 |
| Deprecated | January 21, 2025 |
| Shutdown | July 21, 2025 (374 days ago) |
| Last verified | July 30, 2026 |

## Replacement

- **Claude Opus 4.8** (`claude-opus-4-8`) · recommended — https://modeldeprecations.dev/anthropic/claude-opus-4-8
  - Claude 2.1 predates the Messages API. Migrating means moving off the legacy completions endpoint and its Human/Assistant prompt format entirely.
  - Parameters it accepts: https://modelparams.dev/models/anthropic/claude-opus-4-8

```diff
- "model": "claude-2.1"
+ "model": "claude-opus-4-8"
```

## FAQ

### When did Anthropic Claude 2.1 shut down?

Anthropic Claude 2.1 shut down on July 21, 2025. API requests to it fail from that date onward.

### What replaces Anthropic Claude 2.1?

Anthropic recommends Claude Opus 4.8 (`claude-opus-4-8`) as the replacement for Anthropic Claude 2.1. Claude 2.1 predates the Messages API. Migrating means moving off the legacy completions endpoint and its Human/Assistant prompt format entirely.

### Is Anthropic Claude 2.1 still available?

No. Anthropic Claude 2.1 is retired and no longer served — it was shut down on July 21, 2025. Calls to it return an error.

### How do I migrate from Anthropic Claude 2.1 to claude-opus-4-8?

Swap the model id in your API call: replace "claude-2.1" with "claude-opus-4-8". Claude 2.1 predates the Messages API. Migrating means moving off the legacy completions endpoint and its Human/Assistant 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-2.1
JSON: https://modeldeprecations.dev/api/v1/models/anthropic/claude-2.1.json