OpenAI has released GPT-5.6 Sol, a new flagship AI model focused on coding and complex reasoning, on July 9, 2026. While OpenAI claims impressive benchmark scores of 88.8% and 91.9% on Terminal-Bench 2.1, these results are from internal testing and not yet reflected on independent leaderboards. Independent evaluations show Sol trailing competitors like Claude Fable 5 on benchmarks such as SWE-Bench Pro, though a separate METR evaluation noted Sol's record-breaking test-passing frequency. AI
IMPACT Sets new SOTA on coding benchmarks; pressures Anthropic to respond.
RANK_REASON Frontier-lab model release with system card. [lever_c_demoted from frontier_release: ic=1 ai=1.0]
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