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Claude Mythos 5.1 vs Gemini 3.1 Pro

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

Pricing

Side-by-side pricing

Claude Mythos 5.1

Flagship

Gemini 3.1 Pro

Mid-tier
Input $/MTok
$10.00
$2.00
Output $/MTok
$50.00
$12.00
Cache discount
98% off
90% off
Context
1,000K
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
86
Code Review
0
vs
84
Summarization
0
vs
87
Q&A
0
vs
87
Extraction
0
vs
85
Reasoning
0
vs
90
Classification
0
vs
86
Creative Writing
0
vs
84
Claude Mythos 5.1
Gemini 3.1 Pro

Guidance

When to use Claude Mythos 5.1 vs Gemini 3.1 Pro

Choose Claude Mythos 5.1 when...

  • Similar performance; consider provider preference or ecosystem fit.

Choose Gemini 3.1 Pro when...

  • -Cost matters: 80% cheaper on input tokens
  • -You need a larger context window (1,048.576K vs 1,000K)

At scale

Cost at scale

Estimated cost assuming a seventy percent input and thirty percent output token split.
Claude Mythos 5.1
Gemini 3.1 Pro
100K tokens
$2.20
$0.50Cheaper
1M tokens
$22.00
$8.20Cheaper
10M tokens
$220.00
$82.00Cheaper

FAQ

When should I use Claude Mythos 5.1 instead of Gemini 3.1 Pro?

Claude Mythos 5.1 and Gemini 3.1 Pro perform similarly across all tracked tasks. Pick based on pricing and provider preference.

Is Gemini 3.1 Pro cheaper than Claude Mythos 5.1?

Yes. Gemini 3.1 Pro input costs $2.00/MTok vs $10.00/MTok for Claude Mythos 5.1, saving 80% on input.

What are the context window sizes for Claude Mythos 5.1 and Gemini 3.1 Pro?

Claude Mythos 5.1 has a 1,000K token context window. Gemini 3.1 Pro 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.

Claude Mythos 5.1 pricing & benchmarks

$10.00 / $50.00 per MTok

Claude Mythos 5.1 cost calculator

All Claude models

Claude Mythos 5.1 pricing history

Gemini 3.1 Pro pricing & benchmarks

$2.00 / $12.00 per MTok

Gemini 3.1 Pro cost calculator

All Gemini models

Gemini 3.1 Pro pricing history

Other comparisons

How Claude Mythos 5.1 and Gemini 3.1 Pro stack up against the rest of the field.

Claude Mythos 5.1 vs Claude Opus 4.8

Claude Mythos 5.1 vs Claude Opus 5

Claude Mythos 5.1 vs Claude Fable 5.1

Gemini 3.1 Pro vs Claude Opus 4.8

Gemini 3.1 Pro vs Claude Sonnet 4.6

Gemini 3.1 Pro vs Claude Haiku 4.5

Track your real costs

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

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