AI★★★★★Simon Willison · 2026-07-09
The new GPT-5.6 family: Luna, Terra, Sol
OpenAI has released its new GPT-5.6 family, which includes three sizes of models: Luna, Terra, and Sol. The models are priced per 1M input/output tokens, with Luna being the most affordable and Sol being the most expensive. The new GPT-5.6 family has shown impressive performance in long-running tasks.
📌 Key points
- The GPT-5.6 family includes three sizes of models: Luna, Terra, and Sol
- The models are priced per 1M input/output tokens, with Luna costing $1/$6, Terra
- The new GPT-5.6 family has shown impressive performance in long-running tasks, o
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