Claude 4 Sonnet
Anthropic's 2025 workhorse — superseded by Sonnet 5.5
Verdict
Several releases back from Sonnet 5.5 now, at a higher price ($3/$15) and a fifth of the context window. Only worth keeping where existing evals are tuned against it and nobody has had time to re-run them. New projects should start on Sonnet 5.5.
Other Text Generation & Reasoning
- GPT-6 AstraProduction
OpenAI's most capable model — 1.05M context, 128K output
- GPT-6.1 SolProduction
The OpenAI default — near-Astra quality at a fifth of the price
- GPT-6 LunaProduction
OpenAI's efficient tier — $0.10/$0.50 with the full 1.05M context
- GPT-5.6Superseded
Previous OpenAI family — Sol/Terra/Luna tiers, superseded by GPT-6
- GPT-5Superseded
OpenAI's 2025 flagship — two families back now
- GPT-5 miniSuperseded
OpenAI's 2025 cost-efficient model — superseded by GPT-6 Luna