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Claude Sonnet 4.6 vs Gemini 2.5 Pro

How prompting differs between these two models.

Claude gets XML tag restructuring while Gemini needs no adaptation — prompts are already optimized for Gemini by default.

Subjective side-by-side based on each model's official documentation. Not an empirical benchmark — see /research for measured results.

Claude Sonnet 4.6

Anthropic · claude family

Strengths

extractionanalysisgenerationcode

Reach for it when…

  • Precise instruction following
  • XML-structured outputs
  • Safety-critical analysis
Claude Sonnet 4.6 prompting guide →
Gemini 2.5 Pro

Google · gemini family

Strengths

extractionanalysisgeneration

Reach for it when…

  • Multimodal tasks
  • Large context windows
  • Search-grounded responses
Gemini 2.5 Pro prompting guide →

How they differ in practice

Gemini is the baseline in our evaluation framework, meaning prompts are written for it by default. Claude benefits significantly from XML restructuring, gaining 12% on quality scores. The practical takeaway: if you are already on Gemini, your prompts work as-is. Switching to Claude requires structural changes that Refrase handles automatically.

Try the same prompt on both.

Refrase rewrites your prompt for each model using its own documentation. Run it on Claude Sonnet 4.6 and Gemini 2.5 Pro and compare the outputs side-by-side.

Try with Claude Sonnet 4.6Try with Gemini 2.5 Pro