Model comparison Synced Mar 10, 2026

Anthropic: Claude Opus 4.5 vs Google: Gemini 3.1 Pro Preview Custom Tools

Side-by-side comparison of Anthropic: Claude Opus 4.5 and Google: Gemini 3.1 Pro Preview Custom Tools. Compare pricing, context window, capabilities, and find out which is better for your workflow.

Verdict

strong confidence

Google: Gemini 3.1 Pro Preview Custom Tools leads overall

Google: Gemini 3.1 Pro Preview Custom Tools leads in price and context window and capabilities, making it the stronger choice for most workflows. Anthropic: Claude Opus 4.5 remains a solid alternative depending on your specific needs.

Best for with Anthropic: Claude Opus 4.5

No clear advantages identified

Best for with Google: Gemini 3.1 Pro Preview Custom Tools

Budget-conscious workflowsLong document processingMulti-modal tasks

Side-by-side

Technical specifications

	Anthropic: Claude Opus 4.5	Google: Gemini 3.1 Pro Preview Custom Tools
Provider	Anthropic	Google
Input price	$5/M	$2/M
Output price	$25/M	$12/M
Context window	200K	1.0M
Max output	64K	66K
Capabilities	Tool useVisionReasoning	Tool useVisionAudioReasoning
Released	Nov 24, 2025	Feb 25, 2026

View Anthropic: Claude Opus 4.5 profile View Google: Gemini 3.1 Pro Preview Custom Tools profile

Scoring breakdown

How each dimension compares

Price

Google: Gemini 3.1 Pro Preview Custom Tools leads

Anthropic: Claude Opus 4.5

$25/M tokens