Quoting Romain Huet

📰 Simon Willison's Blog

Learn about the latest developments in GPT-5.5 and its unified Codex system for improved agentic coding and computer tasks

intermediate Published 25 Apr 2026
Action Steps
  1. Explore the capabilities of GPT-5.5
  2. Test the unified Codex system for agentic coding tasks
  3. Compare the performance of GPT-5.5 with previous models
  4. Apply GPT-5.5 to computer-based tasks and evaluate its strong gains
  5. Investigate the implications of not having a separate GPT-5.5-Codex model
Who Needs to Know This

Developers and AI researchers can benefit from understanding the advancements in GPT-5.5, particularly those working with Codex and agentic coding

Key Insight

💡 GPT-5.5 has a unified Codex system, enhancing its capabilities for agentic coding and computer tasks

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🚀 GPT-5.5 unifies Codex for improved agentic coding and computer tasks! 💻

Key Takeaways

Learn about the latest developments in GPT-5.5 and its unified Codex system for improved agentic coding and computer tasks

Full Article

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
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