Model comparison Synced Mar 10, 2026

Google: Gemini 3.1 Pro Preview Custom Tools vs OpenAI: GPT-5.1-Codex-Max

Side-by-side comparison of Google: Gemini 3.1 Pro Preview Custom Tools and OpenAI: GPT-5.1-Codex-Max. 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 and OpenAI: GPT-5.1-Codex-Max are closely matched across pricing, context, and capabilities. Your choice depends on workflow-specific factors like provider ecosystem preference and existing integrations.

Best for with Google: Gemini 3.1 Pro Preview Custom Tools

Long document processingMulti-modal tasks

Best for with OpenAI: GPT-5.1-Codex-Max

Budget-conscious workflowsLong-form content generation

Side-by-side

Technical specifications

	Google: Gemini 3.1 Pro Preview Custom Tools	OpenAI: GPT-5.1-Codex-Max
Provider	Google	OpenAI
Input price	$2/M	$1/M
Output price	$12/M	$10/M
Context window	1.0M	400K
Max output	66K	128K
Capabilities	Tool useVisionAudioReasoning	Tool useVisionReasoning
Released	Feb 25, 2026	Dec 4, 2025

View Google: Gemini 3.1 Pro Preview Custom Tools profile View OpenAI: GPT-5.1-Codex-Max profile

Scoring breakdown