Head-to-head · Updated March 2026
Claude Sonnet 4.6 and Gemini 3.1 Pro are both premium models at similar prices but with different strengths. Claude leads on coding (79.6% SWE-bench, default in Cursor/Windsurf) and writing quality. Gemini 3.1 Pro wins on research depth, context window (2M vs 1M tokens), and is 33% cheaper ($2 vs $3/1M input). For developers and content teams, Claude is the stronger daily driver. For research, document analysis, and cost-sensitive workloads, Gemini is the smarter pick.
Claude Sonnet 4.6
Best daily driver for coding and writing — the model most developers actually reach for.
Gemini 3.1 Pro
Best for research and deep document analysis — 2M context at the best premium price.
| Claude Sonnet 4.6 | Gemini 3.1 Pro | |
|---|---|---|
| Input cost / 1M tokens | $$3.00/1M | $$2.00/1M |
| Output cost / 1M tokens | $$15.00/1M | $$12.00/1M |
| Context window | 1M tokens | 2M tokens |
| Speed | Balanced | Balanced |
| Price tier | Premium | Premium |
Which model wins for each use case — and why.
Claude Sonnet 4.6 scores 79.6% on SWE-bench and is the default in Cursor and Windsurf — the leading AI code editors. Gemini handles code but trails on benchmarks.
Claude Sonnet 4.6 leads the writing category and consistently produces cleaner, more natural prose with better tone control than Gemini 3.1 Pro.
Gemini 3.1 Pro leads ARC-AGI-2 at 77.1% and has a 2M token context window for processing large research documents and corpora in a single pass.
Gemini 3.1 Pro supports 2M tokens vs Claude Sonnet 4.6's 1M. For very large inputs, Gemini has twice the capacity.
Gemini 3.1 Pro costs $2/1M input vs Claude Sonnet 4.6's $3/1M — 33% cheaper. Output is also cheaper at $12 vs $15/1M.
Pick Claude Sonnet 4.6 if…
Pick Gemini 3.1 Pro if…
Is Claude Sonnet 4.6 or Gemini 3.1 Pro better?
Claude Sonnet 4.6 is better for coding and writing. Gemini 3.1 Pro is better for research, large-context work, and cost efficiency. For everyday developer use, Claude wins. For large-document analysis, Gemini wins.
Which is cheaper?
Gemini 3.1 Pro costs $2/$12 per 1M tokens vs Claude Sonnet 4.6's $3/$15. Gemini is 33% cheaper on input and 20% cheaper on output.
Which has a bigger context window?
Gemini 3.1 Pro has a 2M token context window vs Claude Sonnet 4.6's 1M — twice as large. For very long documents or codebases, Gemini has the capacity edge.
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