Claude Mythos 5.1
API ID claude-mythos-5-1
claude-mythos-5-1 is an Anthropic model. It has a 1,000,000-token context window and up to 128,000 output tokens. It takes image input and supports reasoning. Standard price: $10.00 input and $50.00 output per 1M tokens.
- Status
- Active
- Released
- —
- Shutdown
- not before Sep 1, 2027
- Replacement
- —
claude-mythos-5-1 is active. Anthropic says it won't be retired before September 1, 2027.
On cloud platforms
All platform dates| Platform | Platform ID | State | Shutdown | Time left | Replacement | Source |
|---|---|---|---|---|---|---|
| Amazon Bedrock | anthropic.claude-mythos-5-1 | Active | not before Sep 1, 2027 | — | source | |
| Microsoft Foundryversion 1 | claude-mythos-5-1 | Active | none announced | — | source |
Read daily from each platform's own pages. The shutdown date and countdown on this page use Anthropic's own date.
Features
Compare models| Feature | Value | Since | Source |
|---|---|---|---|
| Prompt cachingA prompt prefix you send again and again (system prompt, documents, tools) is cached, so later requests cost less and start faster. | Supported | in place when tracking began (October 6, 2026) | source |
| Batch APISend many requests as one job that runs in the background, usually finished within 24 hours, at a lower price than live requests. | Supported | in place when tracking began (October 6, 2026) | source |
| Image inputImages such as screenshots, photos and charts can go in the prompt for the model to read. | Supported | in place when tracking began (October 6, 2026) | source |
| Reasoning / thinkingThe model can work through a problem step by step before it answers: usually better answers to hard questions, at the cost of more tokens and time. | Supported (thinking: adaptive, always on; default effort: high) | in place when tracking began (October 6, 2026) | source |
| Context windowThe most the model can work with in one request, in tokens: your prompt, conversation history and files. A token is about three-quarters of an English word. | 1,000,000 tokens | in place when tracking began (October 6, 2026) | source |
| Max output tokensThe longest reply the model can write in one response, in tokens. A token is about three-quarters of an English word. | 128,000 tokens | in place when tracking began (October 6, 2026) | source |
Not published by Anthropic: Structured outputs, Function calling, PDF input, Fine-tuning, Built-in web search, temperature parameter, top_p parameter, logprobs.
Price history
USD per 1M tokens, standard tierWe started recording this model's prices on Oct 1, 2026. The history grows with each daily check.
Show as a table
| From | Type | Price |
|---|---|---|
| Oct 1, 2026 | Input | $10.00 |
| Oct 1, 2026 | Output | $50.00 |
Prices
USD per 1M tokens, every type and band, by tier| Type | Price $/1M | In effect |
|---|---|---|
| Standard | ||
| input | $10.00 | |
| cached input | $0.25 | |
| cache write (5 min) | $12.50 | |
| cache write (1 hour) | $20.00 | |
| output | $50.00 | |
| Batch | ||
| input | $5.00 | |
| output | $25.00 | |
Changelog
Changes we detected on Anthropic's pagesNo changes recorded yet.
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Last checked · Sources: Anthropic models, Anthropic deprecations, Anthropic pricing, Anthropic model pages