Claude Mythos 5
Summary
Claude Mythos 5 is a proprietary language model from Anthropic, released on 9 Jun 2026. It accepts text, images and PDFs and generates text, with a 1M-token context window and up to 128K output tokens per response. As of 4 Oct 2026, the lowest listed API price is $10 per million input tokens and $50 per million output tokens (Azure AI Foundry), across 1 provider we track.
Restricted Claude model for advanced cybersecurity and biology research workflows
Last verified 4 Oct 2026. Every figure on this page links to its source.
Specifications
| Developer | Anthropic |
|---|---|
| Release date | 9 Jun 2026 [models.dev] |
| Status | Preview [models.dev] |
| Weights | Proprietary (API only) [models.dev] |
| Context window | 1M (1,000,000 tokens) [models.dev] |
| Max output | 128K tokens [models.dev] |
| Knowledge cutoff | 31 Jan 2026 [models.dev] |
| Input | Text, images and PDFs [models.dev] |
| Output | Text [models.dev] |
| Reasoning mode | Yes [models.dev] |
| Tool calling | Yes [models.dev] |
| Structured output | Yes [models.dev] |
Claude Mythos 5 API pricing by provider
USD per million tokens. Sorted by input price.
| Provider | Input | Output | Cached input | Context | Source |
|---|---|---|---|---|---|
| Azure AI Foundry claude-mythos-5 | $10 | $50 | $1 | 1M | models.dev, 4 Oct 2026 |
Frequently asked questions
What is the context window of Claude Mythos 5?
Claude Mythos 5 has a context window of 1,000,000 tokens (1M) and can generate up to 128,000 tokens in a single response, according to models.dev.
How much does the Claude Mythos 5 API cost?
Claude Mythos 5 is listed from $10 per million input tokens and $50 per million output tokens (Azure AI Foundry). Prices last verified 4 Oct 2026.
Is Claude Mythos 5 open source?
No. Claude Mythos 5 is a proprietary model; Anthropic has not released its weights. It is available through APIs including Azure AI Foundry.
When was Claude Mythos 5 released?
Anthropic released Claude Mythos 5 on 9 Jun 2026, according to models.dev.
Change history
No changes detected since we started tracking this model. We re-check every source daily.