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Claude Sonnet 4.6 vs Gemini 3.1 Flash

2 vs 0 benchmarks won

Anthropic
Claude Sonnet 4.6
Google
Gemini 3.1 Flash
Overview
CompanyAnthropicGoogle
Release dateFeb 17 2026Feb 26 2026
Model type
Open sourceNoNo
Specifications
Parameters
Context window
Benchmarks
Science reasoning
GPQA Diamond
89.9%
Software engineering
SWE-Bench Verified
79.6%
Multimodal understanding
MMMU
Timeline
Release gapClaude Sonnet 4.6 shipped 9 days before Gemini 3.1 Flash

Which is better: Claude Sonnet 4.6 or Gemini 3.1 Flash?

Claude Sonnet 4.6 leads Gemini 3.1 Flash on 2 of the tracked benchmarks (GPQA Diamond, SWE-Bench Verified, MMMU). Claude Sonnet 4.6 shipped 9 days before Gemini 3.1 Flash, so benchmark comparisons should account for the intervening progress.

Published specifications for these two models are limited — see each model page for the latest details.

Direct benchmark comparisons are unavailable — at least one of these models has not published scores on GPQA Diamond, SWE-Bench Verified, or MMMU.

Frequently asked questions

When was Claude Sonnet 4.6 released?
Claude Sonnet 4.6 was released by Anthropic on Feb 17 2026.
When was Gemini 3.1 Flash released?
Gemini 3.1 Flash was released by Google on Feb 26 2026.

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