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#gpt-55-pro

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AI & Machine LearningApril 24, 202612 min
GPT-5.5: OpenAI's First Retrained Base Since GPT-4.5
OpenAI released GPT-5.5 on April 23, 2026 — the first fully retrained base since GPT-4.5. Benchmarks, $5/$30 API pricing, 1M context, and Opus 4.7 compared.

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GPT-5.5: OpenAI's First Retrained Base Since GPT-4.5