How much does Gemini 3.1 Flash Lite cost?

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.

What is the context length of Gemini 3.1 Flash Lite?

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

Does Gemini 3.1 Flash Lite support tool calling and structured outputs?

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.

What inputs and outputs does Gemini 3.1 Flash Lite support?

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

Which providers serve Gemini 3.1 Flash Lite?

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.

When was Gemini 3.1 Flash Lite released?

Gemini 3.1 Flash Lite was released on May 7, 2026.

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

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 Floor (cheapest).

Latency / throughput


	$0.25	$1.50	$0.025	$0.05	0.63s	140 tok/s	100.00%
	$0.25	$1.50	$0.025	$0.05	0.77s	129 tok/s	100.00%
Not used in Standard routing:Why these endpoints are not used
Flex	$0.125	$0.75	$0.0125	$0.025	0.51s	134 tok/s	100.00%
	$0.275	$1.65	$0.0275	$0.055	0.62s	123 tok/s	100.00%
	$0.275	$1.65	$0.0275	$0.055	0.96s	67 tok/s	100.00%
Priority	$0.45	$2.70	$0.045	$0.09	0.99s	123 tok/s	100.00%
Priority	$0.45	$2.70	$0.045	$0.09	0.53s	192 tok/s	100.00%
Flex	$0.125	$0.75	$0.0125	$0.025	15.64s	18 tok/s	91.09%

Input $0.25Output $1.50
140 tok/s100.00% uptime
Input $0.25Output $1.50
129 tok/s100.00% uptime
Not used in Standard routing:Why these endpoints are not used
Input $0.125Output $0.75
Flex
134 tok/s100.00% uptime
Input $0.275Output $1.65
123 tok/s100.00% uptime
Input $0.275Output $1.65
67 tok/s100.00% uptime
Input $0.45Output $2.70
Priority
123 tok/s100.00% uptime
Input $0.45Output $2.70
Priority
192 tok/s100.00% uptime
Input $0.125Output $0.75
Flex
18 tok/s91.09% uptime

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.

Weighted average

Input

$0.1707/M tokens

Output

$1.441/M tokens

Gemini 3.1 Flash Lite — Price history

Price history

No effective price data for this selection

		$0.1313	$1.499	55.3%	18.1%
		$0.1964	$1.499	25.3%	64.7%
Not used in Standard routing:Why these endpoints are not used
	Flex	$0.0821	$0.747	42.7%	7.5%
	Flex	$0.1197	$0.749	5.5%	8.2%
		$0.1765	$1.642	40.4%	0.4%
	Priority	$0.1912	$2.693	63.9%	0.4%
		$0.2495	$1.640	14.9%	0.1%
	Priority	$0.4491	$2.698	0.2%	0.6%

Effective in $0.1313Effective out $1.499
Token share
18.1%
Effective in $0.1964Effective out $1.499
Token share
64.7%
Not used in Standard routing:Why these endpoints are not used
Effective in $0.0821Effective out $0.747
FlexToken share
7.5%
Effective in $0.1197Effective out $0.749
FlexToken share
8.2%
Effective in $0.1765Effective out $1.642
Token share
0.4%
Effective in $0.1912Effective out $2.693
PriorityToken share
0.4%
Effective in $0.2495Effective out $1.640
Token share
0.1%
Effective in $0.4491Effective out $2.698
PriorityToken share
0.6%

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.

Uptime (3d)

100.00%

Availability (3d)

99.78%

Availability over the last 3 days

Last 72 hours

Availability 99.78%

3 Days Ago2 Days AgoYesterdayNow

Availability over the last 24 hours

OpenRouter Availability

99.79%

Without Routing

98.82%

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 provider routing options.

Available through EU in-region routing

Google: Gemini 3.1 Flash Lite is available through EU in-region routing. Requests sent to eu.openrouter.ai are decrypted in the EU and routed only to shared provider endpoints in Europe (the EU/EEA, the UK, and Switzerland).

Providers in Europe

Google Vertex

Prices in Europe

Google Vertex: $0.275/M tokens input, $1.65/M tokens output

Base URL

https://eu.openrouter.ai/api/v1

Plan

Requires Business or Enterprise. Self-serve on Business: no contract, no monthly minimum. OpenRouter Business for EU in-region routing

Fails closed: if no shared provider endpoint in Europe is available, the request errors instead of leaving the region. Requests served by your own BYOK key go to your deployment’s region, which you control. In-region routing docs

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Gemini Omni 1.2 Flash

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Note: video generation is only supported through the Video Generation API. See the guide: https://openrouter.ai/docs/guides/overview/multimodal/video-generation

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Nano Banana 2.1

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Gemini 3.5 Transcribe

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Gemini 3.8 Flash Lite TTS

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Gemini 3.8 Flash (batch)

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Gemini 3.7 Flash

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Gemini 3.6 Flash

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Gemini 3.6 Flash (batch)

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Gemini 3.5 Flash Lite

Gemini 3.5 Flash Lite is a high-efficiency model from Google with upgraded agentic capabilities. It is suited for subagents that execute focused tasks within complex, multi-agent workflows.

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Google: Gemini 3.1 Flash Lite

Providers