Claude Fable 5.1

Anthropic · 3 posts · 8 outlets writing

released 1 September 2026, per models.dev · listed on OpenRouter 1 September 2026 · anthropic/claude-fable-5.1

Announced: 1 September 2026; from Introducing Claude Fable 5.1 and Claude Mythos 5.1
Price: cost an estimated 25% less than Fable 5 for typical workloads; from Introducing Claude Fable 5.1 and Claude Mythos 5.1

Launched with Introducing Claude Fable 5.1 and Claude Mythos 5.1.

Where to run it

Other tracked companies’ own announcements naming this model — each is that platform’s claim, not the lab’s.

AmazonNew model· 5 days ago

Introducing Claude Fable 5.1 on AWS

Amazon announces the availability of Claude Fable 5.1 on Amazon Bedrock, a new model with improved reasoning, agentic coding, autonomous operation, and scientific research capabilities.

GitHubAvailability change5 days ago

← Feed All models

Claude Fable 5.1

Anthropic · 3 posts · 8 outlets writing

released 1 September 2026, per models.dev · listed on OpenRouter 1 September 2026 · anthropic/claude-fable-5.1

Announced: 1 September 2026; from Introducing Claude Fable 5.1 and Claude Mythos 5.1
Price: cost an estimated 25% less than Fable 5 for typical workloads; from Introducing Claude Fable 5.1 and Claude Mythos 5.1

Launched with Introducing Claude Fable 5.1 and Claude Mythos 5.1.

Where to run it

Other tracked companies’ own announcements naming this model — each is that platform’s claim, not the lab’s.

AmazonNew model· 5 days ago

Introducing Claude Fable 5.1 on AWS

Amazon announces the availability of Claude Fable 5.1 on Amazon Bedrock, a new model with improved reasoning, agentic coding, autonomous operation, and scientific research capabilities.

GitHubAvailability change5 days ago

·

Claude Fable 5.1 is generally available in GitHub Copilot

Claude Fable 5.1 from Anthropic is now generally available in GitHub Copilot. It requires data retention by default for safety classifiers, with zero data retention available for eligible enterprise…

Launch and releases

AnthropicNew model· 5 days ago

Introducing Claude Fable 5.1 and Claude Mythos 5.1

Anthropic announces two new models: Claude Fable 5.1 (generally available) and Claude Mythos 5.1 (restricted access).

Availability and pricing

AnthropicAvailability change· 10 days ago

Expanding our support for scientists

Anthropic announces 10,000 free or discounted Claude subscriptions for scientists via a new team plan, expands AI for Science program with up to $50,000 in credits per project, and notes restrictions…

Safety and policy

AnthropicSafety or policy· 5 days ago

Developing Enterprise Frontier Safeguards with our customers

Anthropic announces Enterprise Frontier Safeguards (EFS), a solution that combines zero data retention (ZDR) with state-of-the-art misuse detection safeguards.