Claude Fable 5
Anthropic's most intelligent generally available model — Mythos-class reasoning
Verdict
The new Anthropic flagship. Shares its underlying model with the gated Mythos 5 tier, minus the dual-use safety loosening — for everyday production work the distinction rarely matters. Extended thinking, mature MCP tool use, and the deepest long-context reasoning Anthropic has shipped. Default choice for architecture review and hard multi-step agent work.
Other Text Generation & Reasoning
- GPT-5.6Production
OpenAI current flagship — Sol/Terra/Luna tiers, 1.05M context
- GPT-5Superseded
OpenAI's previous flagship — superseded by GPT-5.6
- GPT-5 miniProduction
OpenAI's cost-efficient GPT-5-tier model — most of the quality at a fraction of the cost
- GPT-4oProduction
OpenAI previous-gen multimodal model — text, vision, audio
- GPT-4o miniStable
OpenAI's previous-gen cost-efficient model — superseded by GPT-5 mini
- GPT-OSS 120BStable
OpenAI's first open-weight model — 120B params, fully downloadable