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OpenAI

Gemini 3.1 Pro Preview vs GPT-5 Codex

A detailed comparison of pricing, benchmarks, and capabilities

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Key Takeaways

Gemini 3.1 Pro Preview wins:

  • Larger context window

GPT-5 Codex wins:

  • Cheaper input tokens
  • Cheaper output tokens
  • Faster response time
  • Higher intelligence benchmark
  • Better at coding
  • Better at math
Price Advantage
GPT-5 Codex
Benchmark Advantage
GPT-5 Codex
Context Window
Gemini 3.1 Pro Preview
Speed
GPT-5 Codex

Pricing Comparison

Benchmark Comparison

Context & Performance

Capabilities

Feature Comparison

FeatureGemini 3.1 Pro PreviewGPT-5 Codex
Vision (Image Input)
Tool/Function Calls
Reasoning Mode
Audio Input
Audio Output
PDF Input
Prompt Caching
Web Search

License & Release

PropertyGemini 3.1 Pro PreviewGPT-5 Codex
LicenseProprietaryProprietary
AuthorGoogleOpenAI
ReleasedFeb 2026Sep 2025

Gemini 3.1 Pro Preview Modalities

Input
audiofileimagetextvideo
Output
text

GPT-5 Codex Modalities

Input
textimage
Output
text

Related Comparisons

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Frequently Asked Questions

GPT-5 Codex has cheaper input pricing at $1.25/M tokens. GPT-5 Codex has cheaper output pricing at $10.00/M tokens.
Gemini 3.1 Pro Preview has a 1,048,576 token context window, while GPT-5 Codex has a 400,000 token context window.
Gemini 3.1 Pro Preview supports vision. GPT-5 Codex supports vision.

Built by @aellman

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