AI Index

Gemini 3.1 Pro previewvsGPT-6 Astra

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

Gemini 3.1 Pro preview on Gemini APIGPT-6 Astra on OpenAI API
Rate appliedBase rateBase rate
Inputper 1M tokens$2.00 $10.00
Cache readper 1M tokens$0.20 $1.00
Outputper 1M tokens$12.00 $50.00
Cost per request$0.040$0.18
Per 1,000 requests$40.00$180.00

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. GPT-6 Astra charges $20.00 / $75.00 above 272K tokens.

0$2.00$4.00$6.000250K500K750K1Mprompt tokens per request200K272K8KGPT-6 Astra$0.18 at 8KGemini 3.1 Pro preview$0.040 at 8K
  • Gemini 3.1 Pro preview · Gemini API
  • GPT-6 Astra · OpenAI 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#35 vs #1 of 118GPT-6 Astra: 169.1Gemini 3.1 Pro preview: 156.2LMArena Text#16 vs #29 of 163GPT-6 Astra: 1,476Gemini 3.1 Pro preview: 1,487LMArena Text · Coding#26 vs #9 of 163GPT-6 Astra: 1,542Gemini 3.1 Pro preview: 1,521LMArena Vision#16 vs #26 of 89GPT-6 Astra: 1,280Gemini 3.1 Pro preview: 1,296
  • Gemini 3.1 Pro preview
  • GPT-6 Astra

Key differences

Gemini 3.1 Pro previewGPT-6 Astra
InputMaker’s official API · global · USD
$2.00 / 1M tokens Gemini API pricing · as of Nov 1, 2026
$10.00 / 1M tokens OpenAI API pricing · as of Nov 2, 2026
OutputMaker’s official API · global · USD
$12.00 / 1M tokens Gemini API pricing · as of Nov 1, 2026
$50.00 / 1M tokens OpenAI API pricing · as of Nov 2, 2026
Context
1,048,576 Gemini 3.1 Pro Preview model · as of Nov 1, 2026
1,050,000 GPT-6 Astra model · as of Nov 5, 2026
Max output
65,536 Gemini 3.1 Pro Preview model · as of Nov 1, 2026
128,000 GPT-6 Astra model · as of Nov 5, 2026
Input modalities
Text, Image, Video, Audio, PDF Gemini 3.1 Pro Preview model · as of Nov 1, 2026
Text, Image GPT-6 Astra model · as of Nov 5, 2026
Cache readMaker’s official API · global · USD
$0.20 / 1M tokens Gemini API pricing · as of Nov 1, 2026
$1.00 / 1M tokens OpenAI API pricing · as of Nov 2, 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

Gemini 3.1 Pro preview Google GPT-6 Astra OpenAI
Overview
ReleasedFeb 19, 2026 Sep 3, 2026
Open weights— —
Knowledge cutoffJan 2025 Apr 2026
Specs
Context1.05M 1.05M
Max input— 922K
Max output65.54K 128K
Input modalitiesText, Image, Video, Audio, PDF Text, Image
Output modalitiesText Text
ReasoningYes Yes
Reasoning effortslow, medium, high low, medium, high, xhigh, max
Reasoning can be offNot stated —
Tool useYes Yes
Structured outputYes Yes
Pricing · per 1M tokens
Input price$2.00Also priced under other conditions: Prompts over 200K tokens, Batch, Flex tier, Priority tier $10.00Also priced under other conditions: Batch, Flex tier, Fast tier, Prompts over 272K tokens, Ultrafast tier
Output price$12.00Also priced under other conditions: Prompts over 200K tokens, Batch, Flex tier, Priority tier $50.00Also priced under other conditions: Batch, Flex tier, Fast tier, Prompts over 272K tokens, Ultrafast tier
Cache read price$0.20Also priced under other conditions: Prompts over 200K tokens, Batch, Flex tier, Priority tier $1.00Also priced under other conditions: Batch, Flex tier, Fast tier, Prompts over 272K tokens, Ultrafast tier
Cache write price— $12.50Also priced under other conditions: 30-minute cache, 12-hour cache, Prompts over 272K tokens, Batch, Flex tier, Fast tier, Ultrafast tier
Blended price (3 input : 1 output)$4.50 $20.00
Pricing under conditions · per 1M tokens
Input price, long prompts$4.00Prompts over 200K tokens $20.00Prompts over 272K tokens
Output price, long prompts$18.00Prompts over 200K tokens $75.00Prompts over 272K tokens
Batch input price$1.00Batch $5.00Batch
Batch output price$6.00Batch $25.00Batch
Flex tier input price$1.00Flex tier $5.00Flex tier
Flex tier output price$6.00Flex tier $25.00Flex tier
Priority tier input price$3.60Priority tier Not offered
Priority tier output price$21.60Priority tier Not offered
Cited scores
Epoch Capabilities Index156.2 169.1
LMArena Text1,487 1,476 max effort
LMArena Text · Coding1,521 1,542 max effort
LMArena Vision1,296 1,280 max effort
LMArena Text · Chinese1,528 1,515 max effort
Epoch AI · GPQA Diamond94.4% high effort95.8% max effort
Epoch AI · FrontierMath Tiers 1–359.6% 93.7% max effort

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