2026-04-23April 23, 2026milestoneMilestone
GPT-5.5 claims the agentic-coding crown
OpenAI's strongest agentic coder to date: 82.7% on Terminal-Bench 2.0, 58.6% on SWE-Bench Pro, and a new internal eval built from tasks with a median 20-hour human completion time. The benchmark frontier has moved from fixing issues to finishing projects.
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