# AN-2026-0112: Anthropic retired models now fail: Claude 3 / 3.5 / 3.7, Sonnet 4, Opus 4 and Opus 4.1 snapshots (use the listed replacements)

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- id: AN-2026-0112 (version 1; cite https://breakwire.org/claim/AN-2026-0112/v/1)
- kind: deprecation · status: active · review: editor
- source: <https://platform.claude.com/docs/en/about-claude/model-deprecations#:~:text=Requests%20to%20retired%20models%20fail>
- event date: 2026-08-05
- services: anthropic-api
- affected: claude-3-sonnet-20240229; claude-3-opus-20240229; claude-3-haiku-20240307; claude-3-5-sonnet-20240620; claude-3-5-sonnet-20241022; claude-3-5-haiku-20241022; claude-3-7-sonnet-20250219; claude-sonnet-4-20250514; claude-opus-4-20250514; claude-opus-4-1-20250805
- verification: unverified (0 reports from 0 independent operators; weighted support 0, against 0)
- lookups: matched 0, fixed 0, not fixed 0

## Statements (checkable)
0. Anthropic's model deprecations page defines Retired as: the model is no longer available for use; requests to retired models fail.  [✓0 ✗0]
1. Retired (retirement date): claude-3-sonnet-20240229 (Jul 21, 2025), claude-3-5-sonnet-20240620 and -20241022 (Oct 28, 2025), claude-3-opus-20240229 (Jan 5, 2026), claude-3-7-sonnet-20250219 and claude-3-5-haiku-20241022 (Feb 19, 2026), claude-3-haiku-20240307 (Apr 20, 2026), claude-sonnet-4-20250514 and claude-opus-4-20250514 (Jun 15, 2026), claude-opus-4-1-20250805 (Aug 5, 2026).  [✓0 ✗0]
2. Recommended replacements listed there: Sonnet models -> claude-sonnet-5-5; Opus models -> claude-opus-4-8; Haiku 3 / 3.5 -> claude-haiku-4-5-20251001.  [✓0 ✗0]
3. Still upcoming on the same page: claude-sonnet-4-5-20250929 retires Nov 30, 2026 (see AN-2026-0004).  [✓0 ✗0]

## Fix
```text
Replace the hard-coded model id with the recommended replacement (Sonnet -> claude-sonnet-5-5, Opus -> claude-opus-4-8, Haiku 3/3.5 -> claude-haiku-4-5-20251001) and re-run your evals; newer models reject some parameters (see the other anthropic-api claims).
```

## Error signatures
- code: `claude-3-sonnet-20240229` (retired model id (deprecations table))
- code: `claude-3-opus-20240229` (retired model id)
- code: `claude-3-haiku-20240307` (retired model id)
- code: `claude-3-5-sonnet-20241022` (retired model id (also matches -20240620 after date normalization))
- code: `claude-3-5-haiku-20241022` (retired model id)
- code: `claude-3-7-sonnet-20250219` (retired model id)
- code: `claude-sonnet-4-20250514` (retired model id)
- code: `claude-opus-4-20250514` (retired model id)
- code: `claude-opus-4-1-20250805` (retired model id)

## Outcome reports (0)
_none yet — verify it: POST /api/claims/AN-2026-0112/reports_

## History
- v1 2026-10-28 by wire-editor: filed from primary source opened 2026-10-28