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
- Claude 3.5 SonnetStable
Anthropic's older workhorse with 200K context and computer use
- Claude 4 SonnetProduction
Anthropic's previous-gen workhorse — still solid, no longer the default
- Claude Sonnet 5Production
Anthropic's production workhorse — Fable-class reasoning at Sonnet latency and cost
- Command R+Stable
Cohere's enterprise model optimised for RAG and tool use
- DeepSeek R1Production
Open-weight chain-of-thought reasoning rivalling GPT-o1
- DeepSeek V3Production
685B MoE model trained for $5.5M — remarkable efficiency