Claude Sonnet 4.5 vs GPT-5.2 Chat

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

Claude Sonnet 4.5 vs GPT-5.2 Chat: 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 Sonnet 4.5 and GPT-5.2 Chat 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 Sonnet 4.5 on Krater · GPT-5.2 Chat on Krater

What each model is best at

Claude Sonnet 4.5

A major update to the Claude Sonnet line, offering near-Opus-level reasoning with significantly faster response times. Claude Sonnet 4.5 is the sweet spot of capability and speed.

Strengths

  • Near-Opus reasoning at Sonnet speed
  • Excellent coding and debugging
  • Strong creative writing abilities
  • Fast for its capability level

Best for

  • Professional development workflows
  • Complex analysis that needs speed
  • Content creation and editing
  • Balanced performance applications

GPT-5.2 Chat

OpenAI's latest general-purpose flagship from the GPT-5 family. GPT-5.2 Chat offers breakthrough conversational abilities, creative writing, and nuanced understanding.

Strengths

  • State-of-the-art conversational ability
  • Exceptional creative writing
  • Advanced multimodal understanding
  • Nuanced, context-aware responses

Best for

  • Complex conversations and brainstorming
  • Creative content creation
  • Multimodal analysis
  • Tasks requiring deep understanding

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.