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GPTvsGemini

GPT 5.4 Pro vs Gemini 3.1 Pro Custom Tools

Side-by-side comparison of pricing, task quality, and projected cost at higher scale.

Pricing

Side-by-side pricing

GPT 5.4 Pro

Flagship

Gemini 3.1 Pro Custom Tools

Mid-tier
Input $/MTok
$30.00
$2.00
Output $/MTok
$180.00
$12.00
Cache discount
0% off
90% off
Context
1,050K
1,048.576K

Quality

Task confidence comparison

Confidence score from zero to one hundred by task type, where higher is better.
Code Generation
0
vs
0
Code Review
0
vs
0
Summarization
0
vs
0
Q&A
0
vs
0
Extraction
0
vs
0
Reasoning
0
vs
0
Classification
0
vs
0
Creative Writing
0
vs
0
GPT 5.4 Pro
Gemini 3.1 Pro Custom Tools

Guidance

When to use GPT 5.4 Pro vs Gemini 3.1 Pro Custom Tools

Choose GPT 5.4 Pro when...

  • -You need a larger context window (1,050K vs 1,048.576K)
  • Similar performance; consider provider preference or ecosystem fit.

Choose Gemini 3.1 Pro Custom Tools when...

  • -Cost matters: 93% cheaper on input tokens

At scale

Cost at scale

Estimated cost assuming a seventy percent input and thirty percent output token split.
GPT 5.4 Pro
Gemini 3.1 Pro Custom Tools
100K tokens
$7.50
$0.50Cheaper
1M tokens
$123.00
$8.20Cheaper
10M tokens
$1230.00
$82.00Cheaper

FAQ

When should I use GPT 5.4 Pro instead of Gemini 3.1 Pro Custom Tools?

GPT 5.4 Pro and Gemini 3.1 Pro Custom Tools perform similarly across all tracked tasks. Pick based on pricing and provider preference.

Is Gemini 3.1 Pro Custom Tools cheaper than GPT 5.4 Pro?

Yes. Gemini 3.1 Pro Custom Tools input costs $2.00/MTok vs $30.00/MTok for GPT 5.4 Pro, saving 93% on input.

What are the context window sizes for GPT 5.4 Pro and Gemini 3.1 Pro Custom Tools?

GPT 5.4 Pro has a 1,050K token context window. Gemini 3.1 Pro Custom Tools has a 1,048.576K token context window.

Go deeper on either model

Per-call cost calculators, provider lineups, and price history for both models on this page.

GPT 5.4 Pro pricing & benchmarks

$30.00 / $180.00 per MTok

GPT 5.4 Pro cost calculator

All GPT models

GPT 5.4 Pro pricing history

Gemini 3.1 Pro Custom Tools pricing & benchmarks

$2.00 / $12.00 per MTok

Gemini 3.1 Pro Custom Tools cost calculator

All Gemini models

Gemini 3.1 Pro Custom Tools pricing history

Other comparisons

How GPT 5.4 Pro and Gemini 3.1 Pro Custom Tools stack up against the rest of the field.

GPT 5.4 Pro vs Claude Opus 4.8

GPT 5.4 Pro vs Claude Sonnet 4.6

GPT 5.4 Pro vs Claude Haiku 4.5

Gemini 3.1 Pro Custom Tools vs Claude Opus 4.8

Gemini 3.1 Pro Custom Tools vs Claude Sonnet 4.6

Gemini 3.1 Pro Custom Tools vs Claude Haiku 4.5

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Comparisons show estimated costs at list price. The dashboard reveals your real spend and savings.

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