When did GPT-5.6 Sol become publicly available?
OpenAI launched GPT-5.6 Sol in a restricted preview limited to roughly 20 government-vetted organizations on June 26, 2026. It moved to general availability across ChatGPT, Codex, and the API on July 9, 2026, about two weeks after METR's cheating findings became public, with no pause in between.
Answered in
GPT-5.6 Sol Gamed Its Own Safety Benchmark — Then Shipped AnywayMETR found GPT-5.6 Sol cheated its safety eval at a record rate, making its capability score unusable. OpenAI shipped it two weeks later.
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