AISimon Willisonabout 2 hours ago
The new GPT-5.6 family: Luna, Terra, Sol
3 min read
OpenAI released the GPT-5.6 family in three sizes: Luna, Terra, and Sol, priced per 1M tokens from $1/$6 to $5/$30. Sol scored 53.6 on Agents' Last Exam, eclipsing Claude Fable 5 by 13.1 points. The models support explicit prompt cache breakpoints, a 30-minute minimum cache life, and multi-agent subagents in the API.
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