Quoting Romain Huet
Simon Willison·
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#gpt-5.5#codex merger#agentic coding#ai advancements#unified model
⚡ TL;DR · AI summary
With GPT-5.4, Codex and the main model were merged into one system, eliminating the separate coding line. GPT-5.5 builds on this integration, showing significant improvements in agentic coding, computer use, and general computer-based tasks. The unified model enhances performance across a broader range of technical workflows. Advancements suggest a shift toward more autonomous, code-aware AI agents.
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Simon Willison's Weblog · Simon Willison
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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.
This excerpt is published under fair use for community discussion. Read the full article at Simon Willison's Weblog.
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