Model Watch · Anthropic
Retired on 5 August 2026. It survives on Bedrock and Google Cloud, and Anthropic dropped its context window off the docs when it went.
Claude Opus 4.1 is a model from Anthropic, built in the US. The lab has put it on the retirement list. Move off it.
No date. Anthropic hasn't given one, so we haven't made one up. The mentions further down are where a date would show up first.
The tracker first logged the name on 7 August 2026 and last saw it on 4 September 2026.
| Lab | Anthropic |
|---|---|
| Built in | US |
| Status | deprecated |
| API model id | claude-opus-4-1-20250805 |
| Released | Not yet |
| Context window | Not published |
| Max output | Not published |
| Input, per 1M tokens | $15.00 |
| Output, per 1M tokens | $75.00 |
List prices per million tokens, read off the lab's own docs. Caching, batching and volume deals all cut the real number, so treat this as the ceiling. Check the source before you budget against it.
At 700 words in and 500 out, twenty times a day, that works out around $38 a month. Put your own numbers in, see every Anthropic price, or put it next to another model.
| Model | Status | Date | Context | In / 1M | Out / 1M |
|---|---|---|---|---|---|
| Claude Opus 4.1 | deprecated | — | — | $15.00 | $75.00 |
| Claude Mythos 5.1 | released | 1 September 2026 | 1M tokens | $10.00 | $50.00 |
| Claude Fable 5.1 | released | 1 September 2026 | 1M tokens | $10.00 | $50.00 |
| Claude Opus 5 | released | 24 July 2026 | 1M tokens | $5.00 | $25.00 |
| Claude Sonnet 5 | released | 30 June 2026 | 1M tokens | $2.00 | $10.00 |
| Claude Fable 5 | released | 9 June 2026 | 1M tokens | $10.00 | $50.00 |
| Claude Opus 4.5 | released | 24 November 2025 | 200K tokens | $5.00 | $25.00 |
| Claude Haiku 4.5 | released | 15 October 2025 | 200K tokens | $1.00 | $5.00 |
| Claude Sonnet 4.5 | released | 29 September 2025 | 200K tokens | $3.00 | $15.00 |
| Claude Opus 5.1 | rumoured | — | — | — | — |
A dash means the lab hasn't published that number for that model.
We tracked 1 public discussion naming Claude Opus 4.1 across r/accelerate on 3 October 2025.
The subject that came up most was availability and outages and benchmark results. A discussion can cover several, so these add up to more than 1.
| What people are discussing | Threads |
|---|---|
| availability and outages | 1 |
| benchmark results | 1 |
Every tracked post, release, changelog entry or incident whose title or summary names Claude Opus 4.1. Newest first, each one linking to where the lab published it.
Now tracking this page; changes will appear here as they happen. Latest announcements: 2026-06-05: Claude Opus 4.1 model; 2026-04-14: Claude Sonnet 4 and Claude Opus 4 models; 2026-02-19: Claude Haiku 3 model; 2025-12-19: Claude Haiku 3.5 model; 2025-10-28: Claude Sonnet 3.7 model; 2025-08-13: Claude Sonnet 3.5 models
0.121.0 (2026-08-07) Full Changelog: v0.120.2...v0.121.0 Features api: add mid-conversation-tool-changes-2026-07-01 beta ( c7d1531 ) api: add support for session budgets, advisor tool, pinned inference location and skills auto-loading from GitHub ( 193bae0 ) Chores api: remove retired Claude Opus 4.1 models ( 5352a33 ) docs: small updates to descriptions ( b8d4176 ) docs: updates to a few documentation strings ( 3a5dd69 ) ensure all dependencies have major version constraints ( #274 ) ( d52999b )
Claude Opus 4.1 is part of the Claude 4 family, which is where the point releases sit next to each other.
The release timeline is every model we know about, filterable by lab, country and date. The tracker is the live feed these mentions come from, and Model Watch is the whole catalogue on one page.
More from Anthropic:
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