Voices
GPT-5.6 Appears to Be Quietly Live in ChatGPT Pro as OpenAI's Chief Scientist Previews a 'Meaningful Improvement,' Late-June Launch Expected
Multiple developers report ChatGPT Pro responses are noticeably faster and stronger than GPT-5.5, and OpenAI's chief scientist has previewed GPT-5.6 as a 'meaningful improvement' targeting a late-June 2026 release; OpenAI has not formally confirmed the model. This is distinct from Altman's separate 'GPT-5 probably this summer' remarks. Builders running evals against ChatGPT Pro should re-baseline now, since an unannounced model swap can silently change output quality and latency.
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