Fable
Model ● Covered in 21 stories + Follow
Fable is an Anthropic language model that has been discussed in the context of coding performance and model usage decisions. Recent coverage includes external claims and criticisms of Anthropic’s Fable product—such as allegations of data retention transparency issues and concerns about how the model is “editorially controlled”—as well as government and research debate about whether other systems, like Moonshot’s K3, could have been derived from Fable. The model has also been cited in coding workflows as a benchmark for capabilities that teams may achieve without extensive changes to harness or orchestration strategies.
Updated 14 September 2026
Specifications
No specifications recorded yet.
Latest developments
Quoting Drew Breunig
Simon Willison’s Weblog · 3 weeks ago ·
33
OpenAI’s Unreleased Model Astra Solves Ten Major Open Mathematics Problems
Zvi (Don't Worry About the Vase) · 1 month ago ·
2
A Backlash Against Anthropic Is Brewing in Silicon Valley
The Wall Street Journal · 1 month ago ·
8
Anthropic's Opus 5 is about token efficiency, not a capability leap
Ars Technica · 1 month ago ·
14
White House’s Response to China Lacks Confidence in America
The Algorithmic Bridge · 1 month ago ·
9
Experts say exploiting Anthropic’s Fable isn’t how Kimi K3 got so good
TechCrunch · 1 month ago ·
9
Treasury threatens sanctions after White House claims Moonshot distilled Anthropic’s Fable
TechCrunch · 1 month ago ·
25
September 2026
August 2026
OpenAI's Astra model solves ten long-standing open problems in mathematics and theoretical computer science Research publication
July 2026
Anthropic releases Claude Opus 5, matching Fable 5 capabilities at half the price Model release
Moonshot AI releases Kimi K3, a 2.8 trillion parameter open-weight model with API pricing and delayed weights availability Model release
Moonshot AI released Kimi K3, an open-weight large language model Model release
OpenAI releases GPT-5.6 Sol, Terra, and Luna models with improved cost-efficiency Model release
Microsoft replaces external AI models with internal alternatives in Office applications to reduce inference costs Feature update
Fable AI system demonstrates significant performance gains in GPU kernel optimization benchmark Benchmark result
Claude Fable 5 Achieves 16.1% Automation Rate on Remote Labor Benchmark Benchmark result
- A Backlash Against Anthropic Is Brewing in Silicon Valley
- Anthropic's Opus 5 is about token efficiency, not a capability leap
- White House’s Response to China Lacks Confidence in America
- Experts say exploiting Anthropic’s Fable isn’t how Kimi K3 got so good
- Treasury threatens sanctions after White House claims Moonshot distilled Anthropic’s Fable
- China’s Low-Priced Z.ai Model Is Exposing Costly Coder Habits
- Microsoft's Nadella criticizes Anthropic's Fable for being 'editorially controlled'
- Better Call Sol The Workhorse
- Better Call Sol The Workhorse
- The AI Industry Has a Really Dark Secret You're Better Off Not Knowing
- My thoughts on Fable
- Import AI 464: Fable writes GPU kernels; AI automation; and analog computation
- The Short Leash AI Coding Method For Beating Fable
- AI #175: The Fable Continues
- Anthropic Reaches Deal With Trump Administration to Restore Access to Fable AI Model
June 2026
Trump Administration Negotiates Partial Lifting of Anthropic Model Export Restrictions Policy change
Anthropic discontinues Fable 5 model following US government suspension over jailbreak vulnerability Incident
US government restricts Anthropic's Fable and Mythos models to US users only following jailbreak vulnerability Security issue
Anthropic releases Claude Fable 5 model with improved benchmarks and new safety restrictions Model release
Relationships
Products & technology
- Anthropic develops this model · 13 sources
- Derived from Mythos · 1 source
- Moonshot derived from this model · 1 source
- OpenAI develops this model · 1 source
Competition
- Competes with Claude Opus · 1 source