GPT-5.1 Codex Max vs GPT-5.4
Compare GPT-5.1 Codex Max and GPT-5.4 side by side. See pricing, capabilities, context length, and performance. Use both on Krater.ai from $20/mo.
GPT-5.1 Codex Max vs GPT-5.4: strengths, best use cases and how to run both side by side. The live page adds context windows, token pricing and more comparisons once it loads.
Try both on Krater
Run GPT-5.1 Codex Max and GPT-5.4 on the same prompt in the Krater Model Arena, then keep the winner in your workflow. One subscription covers both, from $20 a month.
Open Krater chat · GPT-5.1 Codex Max on Krater · GPT-5.4 on Krater
How we compare models
Our tested head-to-heads run the same prompt set through both models in the Model Arena, then rank answers blind. Read the testing methodology, or browse every comparison.