Claude Mythos 5.1
ReleasedModel Claude Mythos 5.1 is a model by Anthropic, released on 1 Sept 2026 (44 days ago).
- Where can it be used?
- For the 14 recorded work products there is no statement; that does not mean “not available”.Available with limits in the provider’s API
- Did we test it?
- No lab run published yet
- Last change
- 44 days ago
- Evidence
- 1 source from 1 siteRegistry entry:
What backs this up?
Three kinds of evidence, kept apart. None of them proves AGI on its own; where one is missing, the page says so.
- In real productsNo statement on use at work recorded — that does not mean “not available”.
- agi.jetzt PrüfstandNo published run yet.
- Public benchmarksNot recorded for this model yet.
A model and the product around it are different things: a result for one does not carry over to the other.
Where can it be used?
Only recorded availability statements are shown. A missing plan or surface means unknown, not unavailable. Where it applies only to a plan or a region, the row says so. “Rolling out” is not “available”. “Rollout reported” means a rollout was reported, but nothing has supported it for more than 90 days.
For the 14 recorded work products there is no statement; that does not mean “not available”.
Developer APIs
Developer access — not a statement about any work product.
| Product | Status | since | Checked | Sources |
|---|---|---|---|---|
| Claude APIAPI | Limited availability | not documented | checked 11 Oct 2026 | 1platform.claude.com |
Where a start is “not documented”, a source check found the state in place; the source names no start date.
What did we test?
No lab run of Claude Mythos 5.1 is published yet.
Nothing is shown until a real run exists. See what the lab tests:
Lifecycle and history
The dates the provider confirmed, and every recorded period of availability. A current period shows its checked status; one without a source check is marked not verified.
What changed?
Sourced changes concerning this model, newest first.
- 44 days agoadded to the record on 11 Oct 2026
1platform.claude.com
Evidence
Every source document behind the facts on this page, by domain.
| Domain | Docs | Documents |
|---|---|---|
| platform.claude.com | 1 |