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Google: Gemini 3.1 Flash Lite

google/gemini-3.1-flash-lite

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Gemini 3.1 Flash Lite is Google’s GA high-efficiency multimodal model optimized for low-latency, high-volume workloads. It supports text, image, video, audio, and PDF inputs, and is designed for lightweight agentic workflows, simple data extraction, and applications where responsiveness and API cost are the primary constraints.

Supports full thinking levels (minimal, low, medium, high) for fine-grained cost/performance trade-offs. Priced at half the cost of Gemini 3 Flash.

Modalities
In / Out Price
$0.25 / $1.50per 1M
Context
1.0M
Released
May 7, 2026
Compare
ProvidersPricingPerformanceUptimeAppsActivityFAQExplore

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), Floor (cheapest), 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.

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.

API

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.

Explore more models

AI Models with Vision: Multimodal LLMs for Image UnderstandingCollectionAI Model RankingsRanking
$0.250$1.50$0.0250$0.0500.61s146 tps
100.00%
$0.250$1.50$0.0250$0.0500.80s136 tps
100.00%
Not used in Standard routing:Why these endpoints are not used
Flex
$0.125$0.75$0.0125$0.02515.64s10 tps
99.79%
Flex
$0.125$0.75$0.0125$0.0250.58s92 tps
100.00%
$0.275$1.65$0.0275$0.0550.47s116 tps
100.00%
$0.275$1.65$0.0275$0.0550.83s302 tps
100.00%
Priority
$0.450$2.70$0.0450$0.0900.99s124 tps
100.00%
Priority
$0.450$2.70$0.0450$0.0900.54s443 tps
100.00%
Throughput
443tok/s

P50, best across providers

Latency
0.47s

P50, best provider

AutoExacto benchmarks
GPQA DiamondTAU-BenchGoogle Vertex (EU)83.2%74.7%Google Vertex83.3%73.3%auto-routing84.5%71.3%Google Vertex (US)82.3%70.0%Google AI Studio82.7%68.7%

Frequently asked questions

Gemini 3.1 Flash Lite is Google’s GA high-efficiency multimodal model optimized for low-latency, high-volume workloads. It supports text, image, video, audio, and PDF inputs, and is designed for lightweight agentic workflows, simple data extraction, and applications where responsiveness and API cost are the primary constraints.

Gemini 3.1 Flash Lite costs $0.25/M input tokens and $1.50/M output tokens, with separate rates for Cache Read at $0.025/M tokens, Cache Write at $0.08333/M tokens, Image Input at $0.25/M tokens, Input Audio at $0.50/M tokens, Input Audio Cache at $0.05/M tokens, and Web Search at $14.00/1K calls.

Gemini 3.1 Flash Lite has a 1,048,576 token context window. It supports up to 65,536 completion tokens.

Yes. Gemini 3.1 Flash Lite accepts tools and tool_choice for function calling. It also supports structured outputs via a JSON schema in response_format.

Gemini 3.1 Flash Lite accepts text, images, video, files such as PDFs, and audio as input and returns text.

Gemini 3.1 Flash Lite is served by 2 providers on OpenRouter: Google Vertex 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 3.1 Flash Lite was released on May 7, 2026.