GPT 5.4 is a big step for Codex

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GPT 5.4 is a significant advancement for Codex, but the author still prefers Claude for evaluating and understanding agents

advanced Published 18 Mar 2026
Action Steps
  1. Evaluate the performance of GPT 5.4 on various tasks
  2. Compare the results with Claude and other language models
  3. Assess the strengths and weaknesses of each model
  4. Consider the implications for agent development and evaluation
Who Needs to Know This

AI researchers and developers benefit from understanding the capabilities and limitations of different language models, such as GPT 5.4 and Claude, to inform their design and development decisions

Key Insight

💡 Different language models have unique strengths and weaknesses, and understanding these differences is crucial for developing effective agents

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🤖 GPT 5.4 advances Codex, but Claude still leads in agent evaluation

Key Takeaways

GPT 5.4 is a significant advancement for Codex, but the author still prefers Claude for evaluating and understanding agents

Full Article

On evaluating and understanding the frontier of agents, and why I still turn to Claude.
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