Expired60% confidenceEventExact time
In the release livestream, OpenAI had GPT-5.6 Sol perform post-training optimization on the smaller GPT-5.6 Luna model, allowing it to autonomously search, run, and optimize within a given compute budget.
2
Sources
60%
Confidence
Medium-term (~90 days)
Relevance
7/20/2026
First Seen
This claim has expired. It is kept for the record and no longer describes the current state.
Valid until: 10/18/2026(expired)
Sources
Related Claims
UnverifiedOpenAI released a new generation model GPT-5.6, internally codenamed Sol, which is reportedly capable of performance close to Fable 5—which has not yet been widely released—but at a lower cost.82% similarUnverifiedIn OpenAI's internal benchmarks, GPT-5.6 Sol leads GPT-5.5 by approximately 16 points on recursive self-improvement (model improvement tasks), and shows a 31% improvement over 5.5 on AI infrastructure optimization (chip design workflows).80% similar
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