Quoting Romain Huet

📰 Simon Willison's Blog

Since GPT-5.4, we’ve unified Codex and the main model into a single system, so there’s no separate coding line anymore. GPT-5.5 takes this further, with strong gains in agentic coding, computer use, and any task on a computer. &mdash; Romain Huet , confirming OpenAI won't release a GPT-5.5-Codex model <p

Published 25 Apr 2026
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