AI Index

Claude Opus 5.5vsGemini 3.1 Pro preview

Both language models, compared at each maker’s own API list prices. Every figure links to its source.

Compare at your usage

Every model priced for the same request
Prompt per request
Cache hits
Batch
Service tier

8,000 tokens in, 2,000 out

Claude Opus 5.5 on Claude APIGemini 3.1 Pro preview on Gemini API
Rate appliedBase rateBase rate
Inputper 1M tokens$4.00 $2.00
Cache readper 1M tokens$0.20 $0.20
Outputper 1M tokens$20.00 $12.00
Cost per request$0.072$0.040
Per 1,000 requests$72.00$40.00

Every model is priced for the same request at its maker’s own list prices (each with its source and date), so bold marks the cheapest. A model that can’t serve the request is named, not ranked; a condition its seller doesn’t price says which rate was used.

Cost per request as prompts grow

2K tokens out, list price on each maker’s API. Gemini 3.1 Pro preview charges $4.00 / $18.00 above 200K tokens.

0$1.00$2.00$3.00$4.000250K500K750K1Mprompt tokens per request200K8KClaude Opus 5.5$0.072 at 8KGemini 3.1 Pro preview$0.040 at 8K
  • Claude Opus 5.5 · Claude API
  • Gemini 3.1 Pro preview · Gemini API

Where each stands among all scored models

Each line runs from the lowest to the highest score on the board; the tick is the median.

Epoch Capabilities Index#3 vs #35 of 118Gemini 3.1 Pro preview: 156.2Claude Opus 5.5: 168.4LMArena Text#3 vs #16 of 163Gemini 3.1 Pro preview: 1,487Claude Opus 5.5: 1,509LMArena Text · Coding#3 vs #26 of 163Gemini 3.1 Pro preview: 1,521Claude Opus 5.5: 1,551LMArena Vision#2 vs #16 of 89Gemini 3.1 Pro preview: 1,296Claude Opus 5.5: 1,321
  • Claude Opus 5.5
  • Gemini 3.1 Pro preview

Key differences

Claude Opus 5.5Gemini 3.1 Pro preview
InputMaker’s official API · global · USD
$4.00 / 1M tokens Claude API pricing · as of Nov 1, 2026
$2.00 / 1M tokens Gemini API pricing · as of Nov 1, 2026
OutputMaker’s official API · global · USD
$20.00 / 1M tokens Claude API pricing · as of Nov 1, 2026
$12.00 / 1M tokens Gemini API pricing · as of Nov 1, 2026
Context
1,000,000 Claude Opus 5.5 model overview · as of Nov 1, 2026
1,048,576 Gemini 3.1 Pro Preview model · as of Nov 1, 2026
Max output
128,000 Claude Opus 5.5 model overview · as of Nov 1, 2026
65,536 Gemini 3.1 Pro Preview model · as of Nov 1, 2026
Input modalities
Text, Image Claude Opus 5.5 model overview · as of Nov 1, 2026
Text, Image, Video, Audio, PDF Gemini 3.1 Pro Preview model · as of Nov 1, 2026
InputMaker’s official API · global · USD · Batch
$2.00 / 1M tokens Claude API pricing · as of Nov 1, 2026
$1.00 / 1M tokens Gemini API pricing · as of Nov 1, 2026

These differences use verified vendor specifications or each maker’s official API on the same region, currency, meter and billing conditions. Different conditions remain side by side in the full table; they do not establish which model is cheaper. Declared features describe support, not measured quality or a recommendation. Missing evidence does not mean a feature is unsupported.

Full comparison

Claude Opus 5.5 Anthropic Gemini 3.1 Pro preview Google
Overview
ReleasedSep 22, 2026 Feb 19, 2026
Open weights— —
Knowledge cutoffJun 2026 Jan 2025
Specs
Context1M 1.05M
Max output128K 65.54K
Input modalitiesText, Image Text, Image, Video, Audio, PDF
Output modalitiesText Text
ReasoningYes Yes
Reasoning effortsmax low, medium, high
Tool useYes Yes
Structured outputYes Yes
Pricing · per 1M tokens
Input price$4.00Also priced under other conditions: Batch $2.00Also priced under other conditions: Prompts over 200K tokens, Batch, Flex tier, Priority tier
Output price$20.00Also priced under other conditions: Batch $12.00Also priced under other conditions: Prompts over 200K tokens, Batch, Flex tier, Priority tier
Cache read price$0.20 $0.20Also priced under other conditions: Prompts over 200K tokens, Batch, Flex tier, Priority tier
Cache write price$5.00Also priced under other conditions: 1-hour cache5-minute cache —
Cache write price (1-hour cache)$8.001-hour cache Not offered
Blended price (3 input : 1 output)$8.00 $4.50
Pricing under conditions · per 1M tokens
Input price, long promptsNot offered $4.00Prompts over 200K tokens
Output price, long promptsNot offered $18.00Prompts over 200K tokens
Batch input price$2.00Batch $1.00Batch
Batch output price$10.00Batch $6.00Batch
Flex tier input priceNot offered $1.00Flex tier
Flex tier output priceNot offered $6.00Flex tier
Priority tier input priceNot offered $3.60Priority tier
Priority tier output priceNot offered $21.60Priority tier
Cited scores
Epoch Capabilities Index168.4 156.2
LMArena Text1,509 high effort1,487
LMArena Text · Coding1,551 high effort1,521
LMArena Vision1,321 high effort1,296
LMArena Text · Chinese1,574 high effort1,528
Epoch AI · GPQA Diamond90.6% max effort94.4% high effort
Epoch AI · FrontierMath Tiers 1–391.2% max effort59.6%

Headline prices may come from different channels, regions or tiers. Check each source before choosing a model; missing facts stay blank.

Model details and sources

Cited scores