Claude Fable 5.1

Specifications

No specifications recorded yet.

Latest developments

GPT‑6 Astra Simon Willison’s Weblog · 13 hours ago · 42

It cost $33 to build a virtual Union Square. Here’s what the agents got wrong. The New Stack · 15 hours ago · 28

😺 Claude Fable 5.1 can do the work. The hard part is managing it. The Neuron · 1 day ago · 46 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

😺Anthropic launched Fable 5.1: and now, the agents cost less The Neuron · 2 days ago · 5

[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

2026

◆ OpenAI releases GPT-6 Astra with a staged rollout to customers and developers, including API availability and new pricing Model release

◆ 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 launched Claude Fable 5.1, a developer-tools offering built around its Claude foundation models for coding and knowledge work Product launch

◆ 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

• 3 Sep GPT‑6 Astra
• 3 Sep It cost $33 to build a virtual Union Square. Here’s what the agents got wrong.
• 2 Sep 😺 Claude Fable 5.1 can do the work. The hard part is managing it.
• 2 Sep Fortune Tech: Anthropic Fable and Mythos 5.1, OpenAI Astra limits, AI token tax
• 2 Sep The Sequence Learning Loop - Issue 925: Learn About Fable and Mythos 5.1, GLM-5.3-Flash, and Qwen 3.8
• 2 Sep 😺Anthropic launched Fable 5.1: and now, the agents cost less
• 2 Sep [AINews] Claude Fable/Mythos 5.1: new SOTA model, 75% cache price cut but 70% more output tokens
• 2 Sep Fable 5.1: The New Best AI Model Is Once Again More Expensive
• 1 Sep Claude Fable 5.1 made me a really nice animated pelican
• 1 Sep Claude Fable 5.1 watermark: It has a blind spot developers can’t ignore
• 1 Sep Anthropic launches Claude Fable 5.1 after inking $35B cloud deal with Lambda
• 1 Sep Anthropic Releases Claude Fable 5.1 and Claude Mythos 5.1: 52.6% on Terminal-Bench-Science and 75% Cheaper Cache Reads
• 1 Sep Anthropic’s Fable 5.1 is a bit cheaper, a bit smarter, and refuses a lot less
• 1 Sep Introducing Claude Fable 5.1 on AWS
• 1 Sep Anthropic launches Claude Fable 5.1 and says it’s up to 45 percent cheaper for agentic work
• 1 Sep Claude Fable 5.1

Relationships

Products & technology

• Anthropic develops this model · 12 sources
• Integrated with Enterprise Frontier Safeguards · 2 sources
• Anthropic deploys this model · 2 sources
• Deploys Terminal-Bench-Science 0.1 · 1 source
• Deploys pelican · 1 source
• Integrated with Terminal-Bench-Science 0.1 · 1 source
• Deploys Claude API · 1 source
• Deploys AWS · 1 source
• Integrated with watermarks detection API · 1 source
• Deploys Amazon Bedrock · 1 source
• Deploys Claude Platform on AWS · 1 source
• Integrated with Claude foundation models · 1 source