# Claude Mythos 5

> 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.

Source page: https://www.aimodel.directory/models/claude-mythos-5
Last verified: 4 Oct 2026

## Specifications

- **Developer:** Anthropic
- **Release date:** 9 Jun 2026 (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/azure/models/claude-mythos-5.toml)
- **Status:** Preview (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/azure/models/claude-mythos-5.toml)
- **Weights:** Proprietary (API only) (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/azure/models/claude-mythos-5.toml)
- **Context window:** 1M (1,000,000 tokens) (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/azure/models/claude-mythos-5.toml)
- **Max output:** 128K tokens (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/azure/models/claude-mythos-5.toml)
- **Knowledge cutoff:** 31 Jan 2026 (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/azure/models/claude-mythos-5.toml)
- **Input:** Text, images and PDFs (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/azure/models/claude-mythos-5.toml)
- **Output:** Text (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/azure/models/claude-mythos-5.toml)
- **Reasoning mode:** Yes (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/azure/models/claude-mythos-5.toml)
- **Tool calling:** Yes (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/azure/models/claude-mythos-5.toml)
- **Structured output:** Yes (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/azure/models/claude-mythos-5.toml)

## API pricing (USD per 1M tokens)

| Provider | Input | Output | Cached input | Context |
|---|---|---|---|---|
| Azure AI Foundry | $10 | $50 | $1 | 1M |

## FAQ

### 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.

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Data licensed CC BY 4.0. Cite as: AI Model Directory, "Claude Mythos 5", https://www.aimodel.directory/models/claude-mythos-5