Where is the Gemini 2.5 Flash Lite documentation?

The Gemini 2.5 Flash Lite documentation on OpenRouter includes the Gemini 2.5 Flash API - Pricing, Quickstart & Provider Comparison blog post. The quickstart covers API keys and your first request, and the API reference lists every parameter.

How much does Gemini 2.5 Flash Lite cost?

Gemini 2.5 Flash Lite costs $0.10/M input tokens and $0.40/M output tokens, with separate rates for Cache Read at $0.01/M tokens, Cache Write at $0.08333/M tokens, Image Input at $0.10/M tokens, Input Audio at $0.30/M tokens, and Input Audio Cache at $0.03/M tokens.

What is the context length of Gemini 2.5 Flash Lite?

Gemini 2.5 Flash Lite has a 1,048,576 token context window. It supports up to 65,535 completion tokens.

Does Gemini 2.5 Flash Lite support tool calling and structured outputs?

Yes. Gemini 2.5 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 2.5 Flash Lite support?

Gemini 2.5 Flash Lite accepts text, images, files such as PDFs, audio, and video as input and returns text.

Which providers serve Gemini 2.5 Flash Lite?

Gemini 2.5 Flash Lite is served by 1 provider on OpenRouter: Google AI Studio.

What other text models does Google have?

Gemini 4 Hydrogen, Gemini Decision 1, Gemini 4 Carbon and 31 more are other text models from Google.

When was Gemini 2.5 Flash Lite released?

Gemini 2.5 Flash Lite was released on July 22, 2025. Its knowledge cutoff is January 31, 2025.

Google: Gemini 2.5 Flash Lite

google/gemini-2.5-flash-lite

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Gemini 2.5 Flash-Lite is a lightweight reasoning model in the Gemini 2.5 family, optimized for ultra-low latency and cost efficiency. It offers improved throughput, faster token generation, and better performance across common benchmarks compared to earlier Flash models. By default, "thinking" (i.e. multi-pass reasoning) is disabled to prioritize speed, but developers can enable it via the Reasoning API parameter to selectively trade off cost for intelligence.

Modalities

In / out price

$0.10 / $0.40per 1M

Context

1.0M

Released

Jul 22, 2025

Knowledge cutoff

Jan 2025

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


	$0.10	$0.40	$0.01	$0.03	0.51s	164 tok/s	100.00%
Not used in Standard routing:Why these endpoints are not used
Flex	$0.05	$0.20	$0.005	$0.015	0.63s	154 tok/s	99.97%
Priority	$0.18	$0.72	$0.018	$0.054	0.53s	142 tok/s	78.02%

Input $0.10Output $0.40
164 tok/s100.00% uptime
Not used in Standard routing:Why these endpoints are not used
Input $0.05Output $0.20
Flex
154 tok/s99.97% uptime
Input $0.18Output $0.72
Priority
142 tok/s78.02% 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

$0.07256/M tokens

Output

$0.3944/M tokens

Gemini 2.5 Flash Lite — Price history

Price history

No effective price data for this selection

		$0.0732	$0.398	30.6%	98.0%
Not used in Standard routing:Why these endpoints are not used
	Flex	$0.0367	$0.198	29.9%	2.0%
	Priority	$0.1282	$0.718	31.8%	0.1%

Effective in $0.0732Effective out $0.398
Token share
98.0%
Not used in Standard routing:Why these endpoints are not used
Effective in $0.0367Effective out $0.198
FlexToken share
2.0%
Effective in $0.1282Effective out $0.718
PriorityToken share
0.1%

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)

99.70%

Availability over the last 3 days

Last 72 hours

Availability 99.70%

3 Days Ago2 Days AgoYesterdayNow

Availability over the last 24 hours

OpenRouter Availability

99.66%

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.

Benchmarks

Scores on standardized evaluations and this model’s own outputs on shared benchmark prompts. Higher percentages are better — and each rank shows where this model lands among the models evaluated on that source.

Benchmark score summary for Google: Gemini 2.5 Flash Lite (Artificial Analysis and Vals AI)
Source	Benchmark	Score
Artificial Analysis	Gemini 2.5 Flash-Lite Preview (Sep '25) (Non-reasoning) GPQA Diamond	65.1%
Artificial Analysis	Gemini 2.5 Flash-Lite Preview (Sep '25) (Non-reasoning) HLE	5.1%
Artificial Analysis	Gemini 2.5 Flash-Lite Preview (Sep '25) (Non-reasoning) IFBench	41.8%
Artificial Analysis	Gemini 2.5 Flash-Lite Preview (Sep '25) (Non-reasoning) τ²-Bench Telecom	30.4%
Artificial Analysis	Gemini 2.5 Flash-Lite Preview (Sep '25) (Non-reasoning) AA-LCR	49.7%
Artificial Analysis	Gemini 2.5 Flash-Lite Preview (Sep '25) (Non-reasoning) CritPt	0.0%
Artificial Analysis	Gemini 2.5 Flash-Lite Preview (Sep '25) (Non-reasoning) LiveCodeBench	64.1%
Artificial Analysis	Gemini 2.5 Flash-Lite Preview (Sep '25) (Non-reasoning) Terminal-Bench Hard	7.6%
Artificial Analysis	Gemini 2.5 Flash-Lite Preview (Sep '25) (Non-reasoning) MMLU-Pro	79.6%
Artificial Analysis	Gemini 2.5 Flash-Lite Preview (Sep '25) (Non-reasoning) AIME 2025	46.7%
Artificial Analysis	Gemini 2.5 Flash-Lite (Reasoning) GPQA Diamond	62.5%
Artificial Analysis	Gemini 2.5 Flash-Lite (Reasoning) HLE	6.8%
Artificial Analysis	Gemini 2.5 Flash-Lite (Reasoning) IFBench	49.9%
Artificial Analysis	Gemini 2.5 Flash-Lite (Reasoning) τ²-Bench Telecom	18.4%
Artificial Analysis	Gemini 2.5 Flash-Lite (Reasoning) AA-LCR	55.7%
Artificial Analysis	Gemini 2.5 Flash-Lite (Reasoning) CritPt	0.0%
Artificial Analysis	Gemini 2.5 Flash-Lite (Reasoning) LiveCodeBench	59.3%
Artificial Analysis	Gemini 2.5 Flash-Lite (Reasoning) Terminal-Bench Hard	4.5%
Artificial Analysis	Gemini 2.5 Flash-Lite (Reasoning) MMLU-Pro	75.9%
Artificial Analysis	Gemini 2.5 Flash-Lite (Reasoning) AIME 2025	53.3%
Artificial Analysis	Gemini 2.5 Flash-Lite (Reasoning) AIME	70.3%
Artificial Analysis	Gemini 2.5 Flash-Lite (Reasoning) MATH-500	96.9%
Artificial Analysis	Gemini 2.5 Flash-Lite (Non-reasoning) GPQA Diamond	47.4%
Artificial Analysis	Gemini 2.5 Flash-Lite (Non-reasoning) HLE	3.7%
Artificial Analysis	Gemini 2.5 Flash-Lite (Non-reasoning) IFBench	31.5%
Artificial Analysis	Gemini 2.5 Flash-Lite (Non-reasoning) τ²-Bench Telecom	19.0%
Artificial Analysis	Gemini 2.5 Flash-Lite (Non-reasoning) AA-LCR	32.0%
Artificial Analysis	Gemini 2.5 Flash-Lite (Non-reasoning) CritPt	0.0%
Artificial Analysis	Gemini 2.5 Flash-Lite (Non-reasoning) LiveCodeBench	40.0%
Artificial Analysis	Gemini 2.5 Flash-Lite (Non-reasoning) Terminal-Bench Hard	2.3%
Artificial Analysis	Gemini 2.5 Flash-Lite (Non-reasoning) MMLU-Pro	72.4%
Artificial Analysis	Gemini 2.5 Flash-Lite (Non-reasoning) AIME 2025	35.3%
Artificial Analysis	Gemini 2.5 Flash-Lite (Non-reasoning) AIME	50.0%
Artificial Analysis	Gemini 2.5 Flash-Lite (Non-reasoning) MATH-500	92.6%
Artificial Analysis	Gemini 2.5 Flash-Lite Preview (Sep '25) (Reasoning) GPQA Diamond	70.9%
Artificial Analysis	Gemini 2.5 Flash-Lite Preview (Sep '25) (Reasoning) HLE	7.0%
Artificial Analysis	Gemini 2.5 Flash-Lite Preview (Sep '25) (Reasoning) IFBench	52.6%
Artificial Analysis	Gemini 2.5 Flash-Lite Preview (Sep '25) (Reasoning) τ²-Bench Telecom	30.7%
Artificial Analysis	Gemini 2.5 Flash-Lite Preview (Sep '25) (Reasoning) AA-LCR	64.7%
Artificial Analysis	Gemini 2.5 Flash-Lite Preview (Sep '25) (Reasoning) CritPt	0.0%
Artificial Analysis	Gemini 2.5 Flash-Lite Preview (Sep '25) (Reasoning) LiveCodeBench	68.8%
Artificial Analysis	Gemini 2.5 Flash-Lite Preview (Sep '25) (Reasoning) Terminal-Bench Hard	12.9%
Artificial Analysis	Gemini 2.5 Flash-Lite Preview (Sep '25) (Reasoning) MMLU-Pro	80.8%
Artificial Analysis	Gemini 2.5 Flash-Lite Preview (Sep '25) (Reasoning) AIME 2025	68.7%
Vals AI	Gemini 2.5 Flash Lite (Nonthinking) MedCode	27.1%
Vals AI	Gemini 2.5 Flash Lite (Nonthinking) MedScribe	72.8%
Vals AI	Gemini 2.5 Flash Lite (Nonthinking) SAGE v1	27.5%

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.

ISEKAI ZERO

AI adventures. Travel with your favorite characters

51.3Btokens

Descript

AI Video & Podcast Editor

41.6Btokens

ProVision.ai

new

35.8Btokens

OpenClaw

OpenClaw is an open-source AI agent that connects to your messaging apps and takes real actions on your behalf, from running commands and browsing the web to managing files and sending emails.

22.1Btokens

categorizator

new

20.3Btokens

Rest of OpenRouter

25.6B

Top 5 Apps

3.23B

Not currently available through EU in-region routing. In-region routing docs

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Gemini 3.6 Flash

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Gemini 3.5 Flash Lite

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Google: Gemini 2.5 Flash Lite

Providers