Models/Google/Gemini 3.1 Pro Preview

Gemini 3.1 Pro Preview

Name: Gemini 3.1 Pro Preview API access
Brand: Google

✓ VERIFIED BY GOOGLE

Google · Proprietary · Released Feb 19, 2026 · google/gemini-3.1-pro-preview

Best $2.00 in / $12.00 out via Google

Compare Estimate cost

1.05M contextVisionToolsReasoningStructured outputPrompt cachingAudio input

Available from 6 providersUSD / MTOK · PRICES 23 MINUTES AGO · SPEED 5 DAYS AGO

EST. MONTHLY COSTclick a row for detail · click headers to sort

PROVIDER	INPUT	OUTPUT	CACHE	CONTEXT	QUANT	TTFT	TPS	UPTIME
Googlegoogle-vertex/global/flexFLEX1ST PARTY	$1.00	$6.00	$0.10	1.05M	—	✕	✕	95.1%
Google AI Studiogoogle-ai-studio/flexFLEX	$1.00	$6.00	$0.10	1.05M	—	—	—	100.0%
Googlegoogle-vertex/global1ST PARTY	$2.00	$12.00	$0.20	1.05M	—	—	—	99.8%
Google AI Studiogoogle-ai-studio	$2.00	$12.00	$0.20	1.05M	—	2.7s	442 tok/s	99.3%
Googlegoogle-vertex/global/priorityPRIORITY1ST PARTY	$3.60	$21.60	$0.36	1.05M	—	—	—	100.0%
Google AI Studiogoogle-ai-studio/priorityPRIORITY	$3.60	$21.60	$0.36	1.05M	—	—	—	—

TTFT/TPS: median (P50) over trailing 504h · chat10k profile (~10K in / 200 out) · measured via OpenRouter routing · ✕ = probed, endpoint returned no measurable stream · methodology v1.1 · measured 5 days ago

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Quality benchmarksCURATED AUG 24, 2026

SWE-bench Verified80.6%SELF-REPORTEDGoogle-reportedsource ↗ 2026-08-24

GPQA Diamond95.45%INDEPENDENTVals independent; Google reports 94.3source ↗ 2026-08-19

LMArena Elo1486INDEPENDENTEntry: gemini-3.1-pro-preview (rank 14)source ↗ 2026-08-21

Terminal-Bench 2.165.8%INDEPENDENTScaffold: Gemini CLIsource ↗ 2026-05-05

Third-party reported results, hand-curated with sources — not measured by ModelIndex. Our own measured serving data (TTFT/TPS/SMOKE) is in the providers table above.

Pricing variants · USD / MTok in / out

STANDARD

$2.00 / $12.00

per MTok in / out

BATCH

$1.00 / $6.00

async batch

CACHE READ $0.20CACHE WRITE $0.375WEB SEARCH $0.014 / search

Recent changesRSS ↗

Oct 6, 2026endpoint removed · cheaperinference8 → 6

Sep 23, 2026endpoint added · cheaperinference6 → 8

About

Gemini 3.1 Pro Preview is Google’s frontier reasoning model, delivering enhanced software engineering performance, improved agentic reliability, and more efficient token usage across complex workflows. Building on the multimodal foundation...

Specifications

Context window1,048,576

Max output65,536

Modalities inaudio, file, image, text, video

Modalities outtext

LicenseProprietary

ReleasedFeb 19, 2026

TokenizerGemini

Nano Banana 2.1$1.50 / $7.50 Gemini 3.8 Flash$0.75 / $3.75 Gemini 3.7 Flash$0.75 / $3.75 Gemini 3.6 Flash$0.75 / $3.75

Compare with

Gemini 3.1 Pro Preview vs Claude Opus 5.5 Gemini 3.1 Pro Preview vs GPT-6.1 Sol Gemini 3.1 Pro Preview vs DeepSeek V4 Pro 0813

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Gemini 3.1 Pro Preview price and speed badge

[![Gemini 3.1 Pro Preview](https://modelindex.ai/badge/google/gemini-3.1-pro-preview)](https://modelindex.ai/models/google/gemini-3.1-pro-preview)

Sources

google ↗23 minutes ago

OFFICIAL PRICING

OpenRouter API23 minutes ago

AGGREGATOR

LiteLLM dataset23 minutes ago

AGGREGATOR

ModelIndex benchmarks13 days ago

MEASURED

✓ Verified against Google’s own source.

Verified 23 minutes ago · list prices, not negotiated rates.