Claude Sonnet 5
Anthropic's production workhorse — Fable-class reasoning at Sonnet latency and cost
Verdict
The one most teams should actually be running in production. Meaningfully sharper than Claude 4 Sonnet on coding and long-context retrieval, without the latency and cost of the Fable tier. MCP tool ecosystem is mature. First pick for agentic workflows, code generation, and day-to-day engineering assistance.
Other Text Generation & Reasoning
- GPT-5Production
OpenAI's most capable model — unified reasoning, vision, and tool use
- 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OpenAI's previous-gen cost-efficient model — superseded by GPT-5 mini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
- Claude Fable 5Production
Anthropic's most intelligent generally available model — Mythos-class reasoning