GPT-5.2 Codex vs OpenAI o3

Compare GPT-5.2 Codex and OpenAI o3 side by side. See pricing, capabilities, context length, and performance. Use both on Krater.ai from $20/mo.

GPT-5.2 Codex vs OpenAI o3: 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-5.2 Codex and OpenAI o3 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-5.2 Codex on Krater · OpenAI o3 on Krater

What each model is best at

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

OpenAI o3

OpenAI's most powerful reasoning model, o3 delivers frontier-level performance on math, science, and coding benchmarks. It represents a major leap in chain-of-thought reasoning capability.

Strengths

  • State-of-the-art reasoning performance
  • Exceptional at math competitions and olympiad problems
  • Superior code generation and debugging
  • Handles multi-step complex problems effortlessly

Best for

  • Advanced mathematical problem-solving
  • Scientific research and analysis
  • Complex software architecture
  • PhD-level reasoning tasks

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.