The Known Good Updated 25 Jul 2026
Google ·Proprietary ·Released February 2026·Tracked since 25 Jul 2026

Google: Gemini 3.1 Pro Preview — quality, speed & price analysis

Compare with another model Provider benchmarks Data sources
Quality
#2 of 61
96based on 4 of 6 evaluations
Known Good Index
Speed
#42 of 316
104.3
Output tokens per second
Price
#287 of 340
$4.50
Blended per 1M tokens
In $2.00 · Out $12.00
Cache hit price
#140 of 206
$0.20
per 1M tokens (−90%)
Context
#22 of 345
1.05M
tokens (~1,600 pages)
Summary

Google: Gemini 3.1 Pro Preview is among the highest-quality models we track, and priced above the tracked average, with mid-range throughput. It accepts audio, file, image, text, video input, outputs text, and supports a 1.05M-token context window.

It scores 96 on the Known Good Index, well above the tracked average of 60, from 4 of the six component evaluations. Measured against the tracked average, its strongest result is MATH / AIME (96 against 53) and its weakest is Humanity's Last Exam (46 against 17).

Pricing is $2.00 per 1M input tokens (below the $2.18 average) and $12.00 per 1M output (above the $9.91 average). Cached input reads at $0.20 per 1M, a 90% discount on its input price. At 104 tokens per second it sits in the fastest quarter of the models we track.

Generated from tracked data on 25 Jul 2026 · how these comparisons are computed →

Technical specifications
ReasoningYes
Input modalityaudio, file, image, text, video
Output modalitytext
Context window1,048,576 tokens
Max output65,536 tokens
WeightsProprietary
Knowledge cutoffJanuary 2025
Tool callingYes
Providers2 hosts · compare →
Highlights — where Google: Gemini 3.1 Pro Preview sits
Quality

Known Good Index · Higher is better · Composite of six published evaluations

98
96
95
94
93
93
93
91
90
90
88
88
83
gpt-5.5-pre-release
Gemini 3.1 Pro
Preview
Gemini 3.5 Flash
Claude Opus 4.7
Qwen3.7 Max
DeepSeek V4 Pro
Kimi K2.6
GLM 5.2
Qwen3.6 Max
Preview
GPT-5.4
Claude Opus 4.6
GLM 5.1
Gemini 3 Flash
Preview
Speed

Output tokens per second · Higher is better · OpenRouter endpoint telemetry

3,894
1,728
1,134
578
449
387
320
179
173
172
168
166
104
Relace Apply 3
Morph V3 Large
Morph V3 Fast
Grok 4.20
Multi-Agent
gpt-oss-safeguard-20b
Nano Banana 2 Lite
(Gemini 3.1 Flash Lite Image)
Mercury 2
Nano Banana
(Gemini 2.5 Flash Image)
Llama 3.2 3B
Instruct
gpt-oss-120b
Laguna XS 2.1
Nano Banana 2
(Gemini 3.1 Flash Image Preview)
Gemini 3.1 Pro
Preview
Price

Blended USD per 1M tokens · Lower is better · Published pricing via OpenRouter

$0.01
$0.02
$0.04
$0.04
$0.04
$0.06
$0.06
$0.06
$0.06
$0.06
$0.06
$0.06
$0.06
$4.50
Ling-2.6-flash
Mistral Nemo
Granite 4.0 Micro
Llama 3 8B Lunaris
Nex-N2-Mini
Qwen2.5 7B
Instruct
gpt-oss-20b
Mistral Small 3
Llama 3.1 8B
Instruct
MythoMax 13B
Nova Micro 1.0
Granite 4.1 8B
Gemma 3 4B
Gemini 3.1 Pro
Preview
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Quality

How Google: Gemini 3.1 Pro Preview compares against every tracked model

Known Good IndexCoding IndexCapability indicesBy open weights
Known Good Index

Composite of GPQA Diamond, MATH / AIME, SWE-bench Verified, LiveBench, Humanity's Last Exam and Terminal-Bench, normalised 0–100. Scores are ingested from Epoch AI; we do not run these evaluations.

13 of 908 models ▾ ☰⚙⇩ +Add model from specific provider
98
96
95
94
93
93
93
91
90
90
88
88
83
💡 Reasoning models are indicated by a lightbulb
The Known Good

Quality Breakdown

Google: Gemini 3.1 Pro Preview on each evaluation feeding the index, against the tracked average

Evaluation scores

Bar = Google: Gemini 3.1 Pro Preview · grey marker = average across tracked models · scores ingested from Epoch AI

GPQA Diamond94 / 63
MATH / AIME96 / 53
Humanity's Last Exam46 / 17
Terminal-Bench80 / 45
The Known Good

Arena Elo

Human preference rating from blind pairwise votes

Text Arena

Elo from blind pairwise votes, ingested from Arena

1479
Elo · 95% CI ±4
#10
of 381 ranked models
85k
votes counted
1486
style-controlled (#8)

Ingested 25 Jul 2026.

The Known Good

Price & Cost

Published API pricing by token type

BlendedInput vs outputCache discountQuality per dollar
Blended Price

USD per 1M tokens at a 3:1 input:output blend. Live from OpenRouter, cross-checked against models.dev. Lower is better.

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$0.01
$0.02
$0.04
$0.04
$0.04
$0.06
$0.06
$0.06
$0.06
$0.06
$0.06
$0.06
$0.06
$4.50
The Known Good
We publish blended price rather than cost-per-task. Cost-per-task requires token counts from an evaluation suite we do not run. Blended price is computed from published rates and is fully reproducible — see the pricing methodology.

Context Window

Maximum input tokens accepted

Context windowMax output tokens
Context Window

Maximum input context from provider metadata via models.dev and OpenRouter. Higher is better.

13 of 908 models ▾ ☰⚙⇩ +Add model from specific provider
2.00M
2.00M
2.00M
2.00M
2.00M
1.31M
1.05M
1.05M
1.05M
1.05M
1.05M
1.05M
1.05M
The Known Good

Speed

Median output throughput across hosting providers

Output speedBy provider
Output Speed

Median output tokens per second across all tracked providers. Derived from OpenRouter endpoint telemetry. Higher is better.

13 of 908 models ▾ ☰⚙⇩ +Add model from specific provider
3,894
1,728
1,134
578
449
387
320
179
173
172
168
166
104
The Known Good

Latency

Time to first token, median across providers

Time to first tokenEnd-to-end response
Latency (TTFT)

Seconds to first streamed chunk, median across tracked providers. Derived from OpenRouter endpoint telemetry. Lower is better.

13 of 908 models ▾ ☰⚙⇩ +Add model from specific provider
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.3
0.3
2.9
The Known Good

Providers

Hosts serving Google: Gemini 3.1 Pro Preview, with their own price and speed

2 providers
Full provider benchmarks →
ProviderInput $/MOutput $/M BlendedSpeedTTFTContext
Google AI Studio $1.00 $6.00 $2.25 163 2.6s 1.05M
Google · first party $1.00 $6.00 $2.25 99 2.6s 1.05M

Per-host pricing and telemetry from OpenRouter. Speed is output tokens per second; TTFT is time to first token.

The Known Good

History

How price and quality have moved since we began tracking this model

Quality & price over time

Since 25 Jul 2026

Known Good Index 96 · based on 4 of 6 evaluations
Blended price $4.50 per 1M · observed 25 Jul 2026
Output speed 104 tok/s · observed 25 Jul 2026
Time to first token 2.9s

No recorded changes for this model since tracking began.

The Known Good

Comparisons

Head-to-head pages pairing Google: Gemini 3.1 Pro Preview with other tracked models

Google: Gemini 3.1 Pro Preview vs Google: Gemini 3.5 Flash Google: Gemini 3.1 Pro Preview vs gpt-5.5-pre-release Google: Gemini 3.1 Pro Preview vs Anthropic: Claude Opus 4.7 Google: Gemini 3.1 Pro Preview vs Qwen: Qwen3.7 Max Google: Gemini 3.1 Pro Preview vs DeepSeek: DeepSeek V4 Pro Google: Gemini 3.1 Pro Preview vs MoonshotAI: Kimi K2.6 Google: Gemini 3.1 Pro Preview vs Z.ai: GLM 5.2 Google: Gemini 3.1 Pro Preview vs Qwen: Qwen3.6 Max Preview All 49 comparisons →
Sources for this page
Pricing & providers — OpenRouter Metadata — models.dev Benchmarks — Epoch AI (CC-BY 4.0)Elo — Arena Full attribution →