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Model

Who uses Claude Fable 5.1

5 people list Claude Fable 5.1 as their model, 1 more use it alongside something else. Newest evidence: Theo Browne, Sep 8, 2026.

Paired with

The harness these people run with Claude Fable 5.1.

Claude Code4T3 Code1
Alex Albert
Research PM / Claude Relations, Anthropic
HarnessClaude Code
ModelClaude Fable 5.1
Works at a lab
Boris Cherny
Creator and Head of Claude Code, Anthropic
HarnessClaude Code
ModelClaude Fable 5.1
Works at a lab
Theo Browne
CEO; developer; T3 Code creator · Ping.gg
HarnessT3 Code
ModelClaude Fable 5.1
Ships products
Kieran Klaassen
GM of Cora & EIR · Every
HarnessClaude Code
ModelClaude Fable 5.1
Engineer
Thariq Shihipar
Claude Code engineer, Anthropic
HarnessClaude Code
ModelClaude Fable 5.1
Works at a lab

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Also in the mix

  • Simon Willison · Used through llm-anthropic with multiple reasoning levels.