Start free
GPTvsGemini

GPT 5.4 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

Mid-tier

Gemini 3.1 Pro Custom Tools

Mid-tier
Input $/MTok
$2.50
$2.00
Output $/MTok
$15.00
$12.00
Cache discount
90% 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
84
vs
0
Code Review
82
vs
0
Summarization
91
vs
0
Q&A
91
vs
0
Extraction
89
vs
0
Reasoning
80
vs
0
Classification
88
vs
0
Creative Writing
78
vs
0
GPT 5.4
Gemini 3.1 Pro Custom Tools

Guidance

When to use GPT 5.4 vs Gemini 3.1 Pro Custom Tools

Choose GPT 5.4 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: 20% 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
Gemini 3.1 Pro Custom Tools
100K tokens
$0.63
$0.50Cheaper
1M tokens
$10.25
$8.20Cheaper
10M tokens
$102.50
$82.00Cheaper

FAQ

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

GPT 5.4 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?

Yes. Gemini 3.1 Pro Custom Tools input costs $2.00/MTok vs $2.50/MTok for GPT 5.4, saving 20% on input.

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

GPT 5.4 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 pricing & benchmarks

$2.50 / $15.00 per MTok

GPT 5.4 cost calculator

All GPT models

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

GPT 5.4 vs Claude Opus 4.8

GPT 5.4 vs Claude Sonnet 4.6

GPT 5.4 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

Track your real costs

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

Free spend teardownStart free dashboard