Model comparison Synced Mar 10, 2026

Google: Gemini 3.1 Pro Preview Custom Tools vs OpenAI: GPT-5.3-Codex

Name: OpenAI: GPT-5.3-Codex
Price: 1.75 USD
Author: openai

Side-by-side comparison of Google: Gemini 3.1 Pro Preview Custom Tools and OpenAI: GPT-5.3-Codex. 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 clearly, winning on 4 of 5 dimensions. Choose Google: Gemini 3.1 Pro Preview Custom Tools unless your workflow specifically requires OpenAI: GPT-5.3-Codex's advantages.

Best for with Google: Gemini 3.1 Pro Preview Custom Tools

Cost-conscious teamsLong-document workflowsMultimodal use casesCutting-edge features

Best for with OpenAI: GPT-5.3-Codex

Long-form generation

Side-by-side

Technical specifications

	Google: Gemini 3.1 Pro Preview Custom Tools	OpenAI: GPT-5.3-Codex
Provider	Google	OpenAI
Input price	$2/M	$2/M
Output price	$12/M	$14/M
Context window	1.0M	400K
Max output	66K	128K
Capabilities	Tool useVisionAudioReasoning	Tool useVisionReasoning
Released	Feb 25, 2026	Feb 24, 2026

View Google: Gemini 3.1 Pro Preview Custom Tools profile View OpenAI: GPT-5.3-Codex profile

Scoring breakdown