Anthropic lists Claude Sonnet 4.5, Haiku 4.5 and Opus 4.5 as Active. Their 2026 dates are floors Anthropic set, not retirements. What deprecation means.
What the table says, model by model
| API model name | Released | State | Deprecated | Retirement |
|---|---|---|---|---|
| claude-sonnet-4-5-20250929 | 2025-09-29 | Active | None | Not sooner than September 29, 2026 (floor) |
| claude-haiku-4-5-20251001 | 2025-10-15 | Active | None | Not sooner than October 15, 2026 (floor) |
| claude-opus-4-5-20251101 | 2025-11-24 | Active | None | Not sooner than November 24, 2026 (floor) |
| claude-opus-4-1-20250805 | 2025-08-05 | Retired | 2026-06-05 | 2026-08-05 |
| claude-sonnet-4-20250514 | 2025-05-22 | Retired | 2026-04-14 | 2026-06-15 |
| claude-opus-4-20250514 | 2025-05-22 | Retired | 2026-04-14 | 2026-06-15 |
| claude-3-7-sonnet-20250219 | 2025-02-24 | Retired | 2025-10-28 | 2026-02-19 |
| claude-3-5-haiku-20241022 | 2024-10-22 | Retired | 2025-12-19 | 2026-02-19 |
| claude-3-haiku-20240307 | 2024-03-13 | Retired | 2026-02-19 | 2026-04-20 |
What's covered
- Anthropic's four lifecycle states
- What the table says, model by model
- What the retired waves show
- What to do
Full guide with every version, risk scores, and live updates: https://endoflife.ai/article-claude-model-retirements-2026
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