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Google DeepMind: Gemini 3.5 Flash

google/gemini-3.5-flash

Gemini 3.5 Flash is Google DeepMind’s proprietary AI model, released May 19, 2026. It costs $1.50/M input and $9/M output tokens, and handles a 1M-token context window. Its strongest use case is coding, where it ranks in the 77th percentile of the models Model Beat tracks.

Gemini 3.5 Flash is Google's high-efficiency multimodal model, bringing near-Pro level coding and reasoning at Flash-tier cost and speed.

Context
1M
Input
$1.50 / 1M
Output
$9 / 1M
Released
May 19, 2026
Modalities
textimagevideofileaudiotext
Strongest atCoding top 23%Reasoning & Knowledge top 24%Math top 33%

Benchmarks

Scores on standardized evaluations. Higher is better — and rank shows where Gemini 3.5 Flash lands among all models tracked on Model Beat.

71.0
Intelligence Index
Epoch AI
71st percentile of tracked models
77.0
Coding Index
Epoch AI
77th percentile of tracked models
62.0
Agentic Index
Epoch AI
62nd percentile of tracked models

Reasoning

7 evals
ARC-AGI92.5%

Abstract visual reasoning

ARC-AGI-272.1%

Harder abstract reasoning

GPQA Diamond92.8%

Graduate-level scientific reasoning

Humanity's Last Exam41.3%

Frontier of human expert knowledge

SimpleBench76.7%

Common-sense trick questions

SimpleQA Verified66.2%

Factual accuracy & hallucination

WeirdML62.6%

Novel ML problem-solving

Coding

3 evals
SciCode53.9%

Scientific research coding

SWE-bench Verified79.3%

Real GitHub issue resolution

WebDev Arena1506

Human-rated web development

Math

3 evals
AIME 2024/202595.6%

Olympiad-qualifier math

FrontierMath39.0%

Research-level math problems

FrontierMath Tier 414.6%

Hardest research math

Agentic & Tools

2 evals
APEX27.5%

Multi-step agentic tasks

τ²-bench95.6%

Tool-agent-user reliability

In the news

4

Changelog

1
  • Gemini 3.5 Flash: reported APEX score fell from 49.6% to 27.5% (-45%)benchmark · Sep 22, 2026

Compare Gemini 3.5 Flash with

Frequently asked questions

What is Gemini 3.5 Flash?

Gemini 3.5 Flash is Google's high-efficiency multimodal model, bringing near-Pro level coding and reasoning at Flash-tier cost and speed.

Who created Gemini 3.5 Flash?

Gemini 3.5 Flash is an AI model developed by Google DeepMind, part of the Gemini family, released May 19, 2026.

How much does Gemini 3.5 Flash cost?

Gemini 3.5 Flash's list price from Google DeepMind is $1.50 per million input tokens and $9 per million output tokens.

What is Gemini 3.5 Flash's context window?

Gemini 3.5 Flash supports a context window of up to 1M tokens.

How does Gemini 3.5 Flash perform on benchmarks?

On standardized evaluations tracked by Epoch AI, Gemini 3.5 Flash scores 79.3% on SWE-bench Verified, 76.7% on SimpleBench, 92.8% on GPQA Diamond.

Is Gemini 3.5 Flash open source?

Gemini 3.5 Flash is a proprietary model (API access), available through its provider's API rather than as a downloadable open-weight model.

Benchmark data from Epoch AI (CC BY) and Artificial Analysis; pricing, specs & descriptions from OpenRouter. Data updated Sep 22, 2026.