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Google: Gemini 3.5 Flash

google/gemini-3.5-flash

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Gemini 3.5 Flash is Google's high-efficiency multimodal model, bringing near-Pro level coding and reasoning at Flash-tier cost and speed. It is highly optimized for coding proficiency and parallel agentic execution loops, supporting text, image, video, audio, and PDF inputs.

Defaults to medium thinking effort for faster and more cost-efficient responses, with full support for thinking levels (minimal, low, medium, high) for fine-grained cost/performance trade-offs.

Modalities

In / Out Price

$1.50 / $9per 1M

Context

1M

Released

May 19, 2026

Knowledge Cutoff

Jan 2025

Compare
ProvidersPricingPerformanceUptimeBenchmarksAppsActivityFAQ

Providers

Different companies host the same model. OpenRouter routes your request to one of them based on the routing mode you pick — Balanced (price + speed), Nitro (fastest), or Exacto (highest tool-calling accuracy).

Pricing

The average price customers actually pay for this model, next to the prices providers post. Caching and discounts mean the price actually paid is often well below the listed one.

Performance

Throughput is how fast the model writes (tokens per second — higher is better). Latency is total round-trip time (lower is better). TTFT is time-to-first-token — how long before you see anything appear (lower is better).

Uptime

Uptime is the percentage of the past 3 days that at least one provider was responding to requests. Availability is the percentage of time that inference was successfully served. OpenRouter continuously monitors and uses the next-best provider when one returns an error.

Benchmarks

Scores on standardized evaluations. Higher percentages are better — and rank percentile shows where this model lands among all models on OpenRouter.

Apps

Public apps that send the most traffic to this model. Good signal for what real production workloads look like — and a hint at which use cases this model is best suited for.

Activity

Token volume and request traffic to this model over time.

Quick Start

Drop-in code to call this model. OpenRouter's API is OpenAI-compatible — most SDKs work by just swapping the base URL. The only thing that changes between models is the model slug below.

About Google: Gemini 3.5 Flash

OpenRouter makes Google: Gemini 3.5 Flash available through a unified, OpenAI-compatible API using the model ID google/gemini-3.5-flash. Requests can be routed across 2 providers, including Google Vertex (US) and Google AI Studio, with automatic failover when an endpoint is unavailable.

Google: Gemini 3.5 Flash accepts text, images, video, files such as PDFs and audio and returns text. It has a 1,048,576-token context window and a maximum output of 65,536 tokens.

On OpenRouter, Google: Gemini 3.5 Flash costs $1.50/M input tokens and $9.00/M output tokens, with separate rates for Cache Read at $0.15/M tokens, Cache Write at $0.08333/M tokens, Image Input at $1.50/M tokens, Input Audio at $3.00/M tokens, Input Audio Cache at $0.30/M tokens and Web Search at $14.00/1K calls. Effective pricing can be lower when prompt caching applies. It was released on May 19, 2026; its knowledge cutoff is January 1, 2025.

More models from Google

  • Gemini 3.7 Flash
  • Gemini 3.6 Flash
  • Gemini 3.5 Flash Lite

Frequently asked questions

Gemini 3.5 Flash is Google's high-efficiency multimodal model, bringing near-Pro level coding and reasoning at Flash-tier cost and speed. It is highly optimized for coding proficiency and parallel agentic execution loops, supporting text, image, video, audio, and PDF inputs.

Gemini 3.5 Flash costs $1.50/M input tokens and $9.00/M output tokens, with separate rates for Cache Read at $0.15/M tokens, Cache Write at $0.08333/M tokens, Image Input at $1.50/M tokens, Input Audio at $3.00/M tokens, Input Audio Cache at $0.30/M tokens and Web Search at $14.00/1K calls.

Gemini 3.5 Flash has a 1,048,576 token context window. It supports up to 65,536 completion tokens.

Yes. Gemini 3.5 Flash accepts tools and tool_choice for function calling. It also supports structured outputs via a JSON schema in response_format.

Gemini 3.5 Flash accepts text, images, video, files such as PDFs and audio as input and returns text.

Gemini 3.5 Flash is served by 2 providers on OpenRouter: Google Vertex (US) and Google AI Studio. Requests are routed to the best available provider, with automatic failover to the others, and you can pin or exclude providers with provider routing.

Gemini 3.5 Flash was released on May 19, 2026. Its knowledge cutoff is January 1, 2025.

$1.50$9.00$0.15$0.301.62s132 tps
99.18%
$1.50$9.00$0.15$0.301.75s189 tps
99.71%
$1.65$9.90$0.165$0.336.38s99 tps
--

Throughput

189tok/s

P50, best across providers

Latency

1.61s

P50, best provider

AutoExacto Benchmarks
GPQA DiamondTAU-Bench
Google Vertex
92.3%81.9%
Google AI Studio
93.3%78.7%
Google Vertex (US)
92.1%76.0%
auto-routing
93.1%74.0%
Uptime (3d)

100.00%

Availability (3d)

99.90%

Availability over the last 3 days

Last 72 hours
Availability 99.90%
3 Days Ago2 Days AgoYesterdayNow

Availability over the last 24 hours

OpenRouter Availability
99.86%
Without Routing
98.31%

When an error occurs in an upstream provider, we can recover by routing to another healthy provider, if your request filters allow it. You can access per-provider uptime data programmatically through the Endpoints API. Learn more about our load balancing and customization options.

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