AI Model
GPT 5.5
byOpenAI
Released on April 23, 2026
Release Summary
OpenAI's smartest general-purpose frontier model for agentic coding, computer use, and knowledge work. State-of-the-art on Terminal-Bench 2.0 (82.7%), SWE-Bench Pro (58.6%), Expert-SWE (73.1%), GDPval (84.9%), OSWorld-Verified (78.7%), and BrowseComp (84.4%). Matches GPT-5.4 per-token latency while using fewer tokens on Codex tasks. Rolling out in ChatGPT and Codex; API pricing at $5/M input and $30/M output with 1M context.
Timeline
April 24, 2026
GPT-5.5 available in the API
OpenAI adds GPT-5.5 and GPT-5.5 Pro to the API and updates the system card with additional safeguards.
April 23, 2026
GPT-5.5 released
OpenAI releases GPT-5.5 and GPT-5.5 Pro in ChatGPT and Codex, with leading benchmark scores across coding, computer use, and knowledge work.