When was Claude Sonnet 4.5 released?

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

When was Gemini 3.0 Flash released?

Gemini 3.0 Flash was released by Google on Dec 17 2025.

Which is better on GPQA Diamond, Claude Sonnet 4.5 or Gemini 3.0 Flash?

Gemini 3.0 Flash scores higher on GPQA Diamond — Claude Sonnet 4.5 83.4% vs Gemini 3.0 Flash 90.4%.

Which is better at coding, Claude Sonnet 4.5 or Gemini 3.0 Flash?

On SWE-Bench Verified (real-world software-engineering tasks), Gemini 3.0 Flash leads — Claude Sonnet 4.5 scores 77.2% and Gemini 3.0 Flash scores 78%.

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Claude Sonnet 4.5 vs Gemini 3.0 Flash

1 vs 2 benchmarks won

	Anthropic Claude Sonnet 4.5	Google Gemini 3.0 Flash
Overview
Company	Anthropic	Google
Release date	Sep 29 2025	Dec 17 2025
Model type	—	—
Open source	No	No
Specifications
Parameters	—	—
Context window	—	—
Benchmarks
Science reasoning GPQA Diamond	83.4%	90.4%
Software engineering SWE-Bench Verified	77.2%	78%
Multimodal understanding MMMU	68%	—
Timeline
Release gap	Claude Sonnet 4.5 shipped 79 days before Gemini 3.0 Flash

Which is better: Claude Sonnet 4.5 or Gemini 3.0 Flash?

Gemini 3.0 Flash leads Claude Sonnet 4.5 on 2 of the tracked benchmarks (GPQA Diamond, SWE-Bench Verified, MMMU). Claude Sonnet 4.5 shipped 79 days before Gemini 3.0 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.

On GPQA Diamond, Gemini 3.0 Flash scores 90.4%, 7 points above Claude Sonnet 4.5 at 83.4%. On SWE-Bench Verified, Gemini 3.0 Flash scores 78%, 0.8 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 3.0 Flash released?: Gemini 3.0 Flash was released by Google on Dec 17 2025.
Which is better on GPQA Diamond, Claude Sonnet 4.5 or Gemini 3.0 Flash?: Gemini 3.0 Flash scores higher on GPQA Diamond — Claude Sonnet 4.5 83.4% vs Gemini 3.0 Flash 90.4%.
Which is better at coding, Claude Sonnet 4.5 or Gemini 3.0 Flash?: On SWE-Bench Verified (real-world software-engineering tasks), Gemini 3.0 Flash leads — Claude Sonnet 4.5 scores 77.2% and Gemini 3.0 Flash scores 78%.