overview changedmodels/mythos-5-1/overview
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11---
22title: Claude Mythos 5.1
33url: https://platform.claude.com/docs/en/models/mythos-5-1/overview
4description: "Claude Mythos 5.1 at a glance: the same model as Claude Fable 5.1, offered by invitation only through Project Glasswing. Model IDs, specifications, pricing, and how to request access."
4description: "Claude Mythos 5.1 at a glance: the same model as Claude Fable 5.1, available only to organizations verified through Anthropic's verification programs. Model IDs, specifications, pricing, and how to request access."
55---
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7**Invite only.** Released September 1, 2026.
7**Verification required.** Released September 1, 2026.
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9Claude Fable 5.1 for Project Glasswing participants
9Claude Fable 5.1 for verified organizations
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1111Model ID: `claude-mythos-5-1`
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1515[Announcement](https://www.anthropic.com/claude-fable-and-mythos-5-1) · [What’s new](https://platform.claude.com/docs/en/models/fable-5-1/whats-new-fable-5-1) · [Migration guide](https://platform.claude.com/docs/en/models/fable-5-1/migration-guide#migrating-from-claude-mythos-5-to-claude-mythos-5-1)
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17Claude Mythos 5.1 is offered separately, by invitation only, as part of Project Glasswing. It shares Claude Fable 5.1’s specifications and pricing. For access, contact your Anthropic, AWS, or Google Cloud account team. [See Claude Fable 5.1](https://platform.claude.com/docs/en/models/fable-5-1/overview) · [Project Glasswing](https://anthropic.com/glasswing)
17Claude Mythos 5.1 is available only to organizations verified through Anthropic’s verification programs, such as the [Cyber Verification Program](https://support.claude.com/en/articles/14604842). It has the same specifications and pricing as Claude Fable 5.1. To request access, apply to the program that covers your use case. [See Claude Fable 5.1](https://platform.claude.com/docs/en/models/fable-5-1/overview) · [How refusals and fallback work](https://platform.claude.com/docs/en/build-with-claude/refusals-and-fallback)
1818
1919## How it compares
2020
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7676| Feature | Value |
7777| :---------------------------------------------------------------------------- | :-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
78| [Status](https://platform.claude.com/docs/en/about-claude/model-deprecations) | Active (invite only) |
78| [Status](https://platform.claude.com/docs/en/about-claude/model-deprecations) | Active (verification required) |
7979| Released | September 1, 2026 |
8080| Retirement | Not sooner than September 1, 2027 |
8181| Platforms | Claude API, [Amazon Bedrock](https://platform.claude.com/docs/en/build-with-claude/claude-in-amazon-bedrock), [Google Cloud](https://platform.claude.com/docs/en/build-with-claude/claude-on-vertex-ai), [Microsoft Foundry](https://platform.claude.com/docs/en/build-with-claude/claude-in-microsoft-foundry) |
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