Claude model deprecations and retirement dates
A retired model doesn't return a warning — it returns an error. This page takes Anthropic's official calendar and flips it into the order that matters to you: what breaks first, and what to move to.
1 model retires in 4 days
claude-opus-4-1-20250805 → claude-opus-4-8 (Aug 5, 2026)
Checked just now · Source: Anthropic documentation
Migrate now
| Model (API name) | Retirement | Time left | Replace with |
|---|---|---|---|
claude-opus-4-1-20250805 | Aug 5, 2026 | 4d | claude-opus-4-8 |
Active models
| Model (API name) | Not retiring before |
|---|---|
claude-sonnet-4-5-20250929 | Sep 29, 2026 |
claude-haiku-4-5-20251001 | Oct 15, 2026 |
claude-opus-4-5-20251101 | Nov 24, 2026 |
claude-opus-4-6 | Feb 5, 2027 |
claude-sonnet-4-6 | Feb 17, 2027 |
claude-opus-4-7 | Apr 16, 2027 |
claude-opus-4-8 | May 28, 2027 |
claude-fable-5 | Jun 9, 2027 |
claude-sonnet-5 | Jun 30, 2027 |
claude-opus-5 | Jul 24, 2027 |
“Not sooner than” is a floor Anthropic announces, not a commitment to retire on that date. Anthropic gives at least 60 days' notice.
Already retired
| Model (API name) | Deprecated on | Retirement | Replace with |
|---|---|---|---|
claude-opus-4-20250514 | Apr 14, 2026 | Jun 15, 2026 | claude-opus-4-8 |
claude-sonnet-4-20250514 | Apr 14, 2026 | Jun 15, 2026 | claude-sonnet-4-6 |
claude-3-haiku-20240307 | Feb 19, 2026 | Apr 20, 2026 | claude-haiku-4-5-20251001 |
claude-3-7-sonnet-20250219 | Oct 28, 2025 | Feb 19, 2026 | claude-sonnet-4-6 |
claude-3-5-haiku-20241022 | Dec 19, 2025 | Feb 19, 2026 | claude-haiku-4-5-20251001 |
Deprecated API parameters
| Parameter | Status | Behavior | Replace with |
|---|---|---|---|
temperature, top_p, top_k | Deprecated (Claude Opus 4.7 and later) | Returns a 400 error when set to a non-default value on Claude 4.7 and later models and Claude Mythos Preview. | Omit and use prompting to guide model behavior. |
Frequently asked questions
What happens if I call a retired Claude model?
The request fails. A retired model is no longer served at all: the API returns an error, with no automatic fallback to a newer model. That's why you migrate before the date, not after.
How much notice does Anthropic give before a retirement?
At least 60 days for publicly released models, with email notification to customers still using the affected model, on top of the documentation update.
What does “not sooner than” a date mean?
It's a floor, not a retirement date. Anthropic commits to not retiring the model before then; the actual retirement is usually announced later, with its own notice period.
Do these dates apply on Bedrock and Vertex AI?
No. These dates cover Anthropic-operated platforms (the Claude API, AWS and Microsoft Foundry). Amazon Bedrock and Google Cloud set their own schedules, which can differ.