# Anthropic Claude Sonnet 3.7 — deprecation status

> Yes — Claude Sonnet 3.7 is retired. Anthropic deprecated it on October 28, 2025 and shut it down on February 19, 2026; API requests to it now fail. The recommended replacement is Claude Sonnet 4.6.

The first Claude with extended thinking, and the release that made a visible reasoning budget a mainstream API feature. It was retired in February 2026, almost exactly a year after launch.

## Facts

| Field | Value |
| --- | --- |
| Provider | Anthropic |
| Model id | `claude-3-7-sonnet-20250219` |
| Status | Retired |
| Aliases | `claude-3-7-sonnet-latest` |
| Released | February 19, 2025 |
| Deprecated | October 28, 2025 |
| Shutdown | February 19, 2026 (161 days ago) |
| Last verified | July 30, 2026 |

## Replacement

- **Claude Sonnet 4.6** (`claude-sonnet-4-6`) · recommended — https://modeldeprecations.dev/anthropic/claude-sonnet-4-6
  - Sonnet 4.6 uses adaptive thinking rather than an explicit budget, so the thinking.budget_tokens field Sonnet 3.7 introduced no longer applies.
  - Parameters it accepts: https://modelparams.dev/models/anthropic/claude-sonnet-4-6

```diff
- "model": "claude-3-7-sonnet-20250219"
+ "model": "claude-sonnet-4-6"
```

## FAQ

### When did Anthropic Claude Sonnet 3.7 shut down?

Anthropic Claude Sonnet 3.7 shut down on February 19, 2026. API requests to it fail from that date onward.

### What replaces Anthropic Claude Sonnet 3.7?

Anthropic recommends Claude Sonnet 4.6 (`claude-sonnet-4-6`) as the replacement for Anthropic Claude Sonnet 3.7. Sonnet 4.6 uses adaptive thinking rather than an explicit budget, so the thinking.budget_tokens field Sonnet 3.7 introduced no longer applies.

### Is Anthropic Claude Sonnet 3.7 still available?

No. Anthropic Claude Sonnet 3.7 is retired and no longer served — it was shut down on February 19, 2026. Calls to it return an error.

### How do I migrate from Anthropic Claude Sonnet 3.7 to claude-sonnet-4-6?

Swap the model id in your API call: replace "claude-3-7-sonnet-20250219" with "claude-sonnet-4-6". Sonnet 4.6 uses adaptive thinking rather than an explicit budget, so the thinking.budget_tokens field Sonnet 3.7 introduced no longer applies.

### Does this apply to claude-3-7-sonnet-latest too?

Yes. Anthropic Claude Sonnet 3.7 is also published as `claude-3-7-sonnet-latest`; that id shares the same lifecycle dates as `claude-3-7-sonnet-20250219`.

## 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-3-7-sonnet-20250219
JSON: https://modeldeprecations.dev/api/v1/models/anthropic/claude-3-7-sonnet-20250219.json