Anthropic marks a Claude model deprecated, then retires it on a stated date, after which API calls fail. Dated snapshot ids are the ones that retire; the migration target is usually the next snapshot of the same family.
We track 22 Anthropic Claude models, 21 of them with a published retirement date. 1 need attention now.
Deprecated models still answer but are superseded. Anything inside the 90-day window has a date attached and will stop answering on it.
| Model | State | Retirement | Replacement |
|---|---|---|---|
| claude-mythos-preview | deprecated | Not announced | — |
These ids no longer answer. If one appears in your code or in something an assistant wrote for you, it is already broken.
| Model | State | Retirement | Replacement |
|---|---|---|---|
| claude-3-5-haiku-20241022 | retired | 2026-02-19 · retired | — |
| claude-3-7-sonnet-20250219 | retired | 2026-02-19 · retired | — |
| claude-3-haiku-20240307 | retired | 2026-04-20 · retired | — |
| claude-opus-4-20250514 | retired | 2026-06-15 · retired | — |
| claude-sonnet-4-20250514 | retired | 2026-06-15 · retired | — |
| claude-opus-4-1-20250805 | retired | 2026-08-05 · retired | — |
Active, announced, or legacy with no imminent date. Legacy models are superseded but still served.
| Model | State | Retirement | Replacement |
|---|---|---|---|
| claude-fable-5 | active | 2027-06-09 · in 244 days | — |
| claude-fable-5-1 | active | 2027-09-01 · in 328 days | — |
| claude-haiku-4-5-20251001 | active | 2026-10-15 · in 7 days | — |
| claude-mythos-5 | active | 2027-06-09 · in 244 days | — |
| claude-mythos-5-1 | active | 2027-09-01 · in 328 days | — |
| claude-opus-4-5-20251101 | active | 2026-11-24 · in 47 days | — |
| claude-opus-4-6 | active | 2027-02-05 · in 120 days | — |
| claude-opus-4-7 | active | 2027-04-16 · in 190 days | — |
| claude-opus-4-8 | active | 2027-05-28 · in 232 days | — |
| claude-opus-5 | active | 2027-07-24 · in 289 days | — |
| claude-opus-5-5 | active | 2027-09-22 · in 349 days | — |
| claude-sonnet-4-5-20250929 | active | 2026-09-29 · past due | — |
| claude-sonnet-4-6 | active | 2027-02-17 · in 132 days | — |
| claude-sonnet-5 | active | 2027-06-30 · in 265 days | — |
| claude-sonnet-5-5 | active | 2027-09-28 · in 355 days | — |
A list of dates only helps once you know which of these models your own traffic hits. One line of code meters the models your app actually calls, then reports the monthly spend sitting on each retiring id and what the move to its replacement costs.
Source: Anthropic — Model deprecations. Every record links the page it was parsed from and keeps Anthropic’s own wording, so a normalization decision stays checkable.