Claude Haiku 4.5 vs GPT-5.2 Codex

Compare Claude Haiku 4.5 and GPT-5.2 Codex side by side. See pricing, capabilities, context length, and performance. Use both on Krater.ai from $20/mo.

Claude Haiku 4.5 vs GPT-5.2 Codex: 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 Haiku 4.5 and GPT-5.2 Codex 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 Haiku 4.5 on Krater · GPT-5.2 Codex on Krater

What each model is best at

Claude Haiku 4.5

The newest and fastest model in the Claude family. Claude Haiku 4.5 delivers impressive capabilities at lightning speed, perfect for real-time applications and high-volume usage.

Strengths

  • Ultra-fast response times
  • Previous-gen Sonnet-level quality
  • Very cost-effective
  • Strong coding for its speed tier

Best for

  • Real-time chat applications
  • High-volume API usage
  • Quick coding assistance
  • Cost-sensitive deployments

GPT-5.2 Codex

OpenAI's dedicated coding powerhouse from the GPT-5 family. GPT-5.2 Codex delivers exceptional performance on software engineering tasks, from code generation to complex debugging.

Strengths

  • Top-tier code generation across all languages
  • Deep understanding of software architecture
  • Excellent at debugging and refactoring
  • Strong at code review and optimization

Best for

  • Professional software development
  • Large codebase refactoring
  • Complex algorithm implementation
  • Full-stack development assistance

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.