Claude Opus 4.6 vs GPT-5.1 Codex Max

Compare Claude Opus 4.6 and GPT-5.1 Codex Max side by side. See pricing, capabilities, context length, and performance. Use both on Krater.ai from $20/mo.

Claude Opus 4.6 vs GPT-5.1 Codex Max: 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 Claude Opus 4.6 and GPT-5.1 Codex Max 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 · Claude Opus 4.6 on Krater · GPT-5.1 Codex Max on Krater

What each model is best at

Claude Opus 4.6

Anthropic's most powerful model ever. Claude Opus 4.6 delivers unparalleled reasoning depth, creative nuance, and coding capability with a 200K token context window.

Strengths

  • Deepest reasoning of any Claude model
  • Exceptional creative and analytical writing
  • Top-tier coding across all languages
  • Handles the most complex multi-step tasks

Best for

  • The most challenging intellectual tasks
  • Complex research and analysis
  • Professional creative writing
  • Enterprise-critical applications

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.