PyyanThe AI Index

Pyyan / Compare / Grok Build 0.1 vs Claude Fable 5

Grok Build 0.1 vs Claude Fable 5

2 of 5

Language Models · verified 13 Aug 2026

Grok Build 0.1xAIcurrent
Claude Fable 5Anthropiccurrent
3 slots left
SpecificationGrok Build 0.1Claude Fable 5
SummaryxAI's dedicated coding model.Most capable widely released model, for the hardest reasoning and long-horizon agentic work.
Context256K1M
Input ($/Mtok)$1$10
Output ($/Mtok)$2$50
LicenceProprietaryProprietary
Max output—128K
Released29 May 2026—
Model IDgrok-build-0.1claude-fable-5
CategoryLanguage ModelsLanguage Models
OfficialxAI ↗Anthropic ↗

Highlighted rows are where these differ.

Grok Build 0.1

xAI's dedicated coding model.

Best for coding.

Full spec sheet →

Claude Fable 5

  • Thinking is always on — the `thinking` param is rejected
  • Raw chain of thought is never returned
  • Requires 30-day data retention; unavailable under ZDR

Best for the hardest problems.

Full spec sheet →