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Claude Mythos 5.1

Model ● Covered in 7 stories + Follow

This profile is built automatically from TLDRocket coverage.

Specifications

No specifications recorded yet.

Latest developments

Fortune Tech: Anthropic Fable and Mythos 5.1, OpenAI Astra limits, AI token tax Fortune · 40
The Sequence Learning Loop - Issue 925: Learn About Fable and Mythos 5.1, GLM-5.3-Flash, and Qwen 3.8 TheSequence · 1 day ago · 49
[AINews] Claude Fable/Mythos 5.1: new SOTA model, 75% cache price cut but 70% more output tokens Latent Space · 2 days ago · 8
Fable 5.1: The New Best AI Model Is Once Again More Expensive Trending Topics · 2 days ago · 39
Anthropic launches Claude Fable 5.1 after inking $35B cloud deal with Lambda SiliconANGLE · 2 days ago · 38 Anthropic Releases Claude Fable 5.1 and Claude Mythos 5.1: 52.6% on Terminal-Bench-Science and 75% Cheaper Cache Reads MarkTechPost · 2 days ago · 6
Anthropic’s Fable 5.1 is a bit cheaper, a bit smarter, and refuses a lot less The New Stack · 2 days ago · 31

Timeline

Month Quarter Year

2026

Anthropic released the Claude Fable 5.1 and Claude Mythos 5.1 AI models with updated pricing and restricted availability for vetted organizations. Model release

Anthropic released Claude Fable 5.1 and Claude Mythos 5.1, including changes to agent API behavior and watermark-based text detection. Model release

Anthropic released updated Claude Fable 5.1 and Mythos 5.1 models with revised pricing, access limits, and additional safety and watermark-detection features Model release

Anthropic launches Claude Fable 5.1 and Claude Mythos 5.1, including AWS Bedrock availability and agentic-work pricing changes. Product launch

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