When was Claude Sonnet 4.5 released?

Claude Sonnet 4.5 was released by Anthropic on Sep 29 2025.

When was Gemini 3.1 Pro released?

Gemini 3.1 Pro was released by Google on Feb 19 2026.

Which is better on GPQA Diamond, Claude Sonnet 4.5 or Gemini 3.1 Pro?

Gemini 3.1 Pro scores higher on GPQA Diamond — Claude Sonnet 4.5 83.4% vs Gemini 3.1 Pro 94.3%.

Which is better at coding, Claude Sonnet 4.5 or Gemini 3.1 Pro?

On SWE-Bench Verified (real-world software-engineering tasks), Gemini 3.1 Pro leads — Claude Sonnet 4.5 scores 77.2% and Gemini 3.1 Pro scores 80.6%.

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Claude Sonnet 4.5 vs Gemini 3.1 Pro

1 vs 2 benchmarks won

	Anthropic Claude Sonnet 4.5	Google Gemini 3.1 Pro
Overview
Company	Anthropic	Google
Release date	Sep 29 2025	Feb 19 2026
Model type	—	—
Open source	No	No
Specifications
Parameters	—	—
Context window	—	—
Benchmarks
Science reasoning GPQA Diamond	83.4%	94.3%
Software engineering SWE-Bench Verified	77.2%	80.6%
Multimodal understanding MMMU	68%	—
Timeline
Release gap	Claude Sonnet 4.5 shipped 143 days before Gemini 3.1 Pro

Which is better: Claude Sonnet 4.5 or Gemini 3.1 Pro?

Gemini 3.1 Pro leads Claude Sonnet 4.5 on 2 of the tracked benchmarks (GPQA Diamond, SWE-Bench Verified, MMMU). Claude Sonnet 4.5 shipped 143 days before Gemini 3.1 Pro, 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.

On GPQA Diamond, Gemini 3.1 Pro scores 94.3%, 10.9 points above Claude Sonnet 4.5 at 83.4%. On SWE-Bench Verified, Gemini 3.1 Pro scores 80.6%, 3.4 points above Claude Sonnet 4.5 at 77.2%.

Frequently asked questions

When was Claude Sonnet 4.5 released?: Claude Sonnet 4.5 was released by Anthropic on Sep 29 2025.
When was Gemini 3.1 Pro released?: Gemini 3.1 Pro was released by Google on Feb 19 2026.
Which is better on GPQA Diamond, Claude Sonnet 4.5 or Gemini 3.1 Pro?: Gemini 3.1 Pro scores higher on GPQA Diamond — Claude Sonnet 4.5 83.4% vs Gemini 3.1 Pro 94.3%.
Which is better at coding, Claude Sonnet 4.5 or Gemini 3.1 Pro?: On SWE-Bench Verified (real-world software-engineering tasks), Gemini 3.1 Pro leads — Claude Sonnet 4.5 scores 77.2% and Gemini 3.1 Pro scores 80.6%.