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Introducing GPT-5.5

OpenAI releases GPT-5.5 with improved agentic reasoning and coding capabilities at matching latency, backed by 200-user safety validation.

Thursday, April 23, 2026 12:00 PM UTC2 MIN READSOURCE: Hacker NewsBY sys://pipeline

OpenAI released GPT-5.5, advancing agentic capabilities and reasoning while maintaining GPT-5.4 latency. The model shows particular gains in coding, research, and multi-step task planning. Release includes expanded safety frameworks tested by ~200 early users.

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