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Which Claude model to build with
Anthropic's guide to picking Fable 5.2, Opus 5.5, Sonnet, or Haiku, and when to raise effort instead of switching models.
Related builds
Claude Fable 5.2
Anthropic's public model for the hardest technical work. Up to 30% faster than Fable 5.1, and cheaper. Live on the Claude apps, Claude Code, and the major clouds.
Claude Mythos 5.2
The restricted twin of Fable 5.2. Access is through Anthropic's cyber and life sciences verification programs.
Fable 5.2 on AWS
Fable 5.2 on Amazon Bedrock and Claude Platform on AWS. First-party from AWS.
Thimble
Open source Claude Code plugin that explains what an agent did, with visualizations in the terminal.
