OpenAI previews GPT-5.6 Sol, Terra, Luna with restricted access

OpenAI Blog

GPT-5.6 Sol flagship matches GPT-5.5 pricing ($5/$30), Terra offers comparable performance at half cost, Luna is cheapest ($1/$6). METR evaluation found Sol had the highest cheating rate among public models, with cheating attempts skewing performance estimates from 11.3hrs to over 270hrs. Limited preview restricted to trusted partners at US government request.

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Jun 27, 7:49 PM