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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 parameterOpens in new tab 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
Compare
ProvidersPricingPerformanceUptimeBenchmarksAppsActivityDocumentationFAQExplore

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).

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 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)
SourceBenchmarkScore
Artificial AnalysisGemini 2.5 Flash-Lite (Non-reasoning) Intelligence Index6.7
Artificial AnalysisGemini 2.5 Flash-Lite (Non-reasoning) Math Index35.3
Artificial AnalysisGemini 2.5 Flash-Lite (Non-reasoning) GPQA Diamond47.4%
Artificial AnalysisGemini 2.5 Flash-Lite (Non-reasoning) HLE3.7%
Artificial AnalysisGemini 2.5 Flash-Lite (Non-reasoning) IFBench31.5%
Artificial AnalysisGemini 2.5 Flash-Lite (Non-reasoning) τ²-Bench Telecom19.0%
Artificial AnalysisGemini 2.5 Flash-Lite (Non-reasoning) AA-LCR32.0%
Artificial AnalysisGemini 2.5 Flash-Lite (Non-reasoning) CritPt0.0%
Artificial AnalysisGemini 2.5 Flash-Lite (Non-reasoning) LiveCodeBench40.0%
Artificial AnalysisGemini 2.5 Flash-Lite (Non-reasoning) Terminal-Bench Hard2.3%
Artificial AnalysisGemini 2.5 Flash-Lite (Non-reasoning) MMLU-Pro72.4%
Artificial AnalysisGemini 2.5 Flash-Lite (Non-reasoning) AA-Omniscience Accuracy15.4%
Artificial AnalysisGemini 2.5 Flash-Lite (Non-reasoning) AA-Omniscience Non-Hallucination Rate12.2%
Artificial AnalysisGemini 2.5 Flash-Lite (Non-reasoning) AIME 202535.3%
Artificial AnalysisGemini 2.5 Flash-Lite (Non-reasoning) AIME50.0%
Artificial AnalysisGemini 2.5 Flash-Lite (Non-reasoning) MATH-50092.6%
Artificial AnalysisGemini 2.5 Flash-Lite Preview (Sep '25) (Reasoning) Intelligence Index10.4
Artificial AnalysisGemini 2.5 Flash-Lite Preview (Sep '25) (Reasoning) Math Index68.7
Artificial AnalysisGemini 2.5 Flash-Lite Preview (Sep '25) (Reasoning) GPQA Diamond70.9%
Artificial AnalysisGemini 2.5 Flash-Lite Preview (Sep '25) (Reasoning) HLE7.0%
Artificial AnalysisGemini 2.5 Flash-Lite Preview (Sep '25) (Reasoning) IFBench52.6%
Artificial AnalysisGemini 2.5 Flash-Lite Preview (Sep '25) (Reasoning) τ²-Bench Telecom30.7%
Artificial AnalysisGemini 2.5 Flash-Lite Preview (Sep '25) (Reasoning) AA-LCR64.7%
Artificial AnalysisGemini 2.5 Flash-Lite Preview (Sep '25) (Reasoning) CritPt0.0%
Artificial AnalysisGemini 2.5 Flash-Lite Preview (Sep '25) (Reasoning) LiveCodeBench68.8%
Artificial AnalysisGemini 2.5 Flash-Lite Preview (Sep '25) (Reasoning) Terminal-Bench Hard12.9%
Artificial AnalysisGemini 2.5 Flash-Lite Preview (Sep '25) (Reasoning) MMLU-Pro80.8%
Artificial AnalysisGemini 2.5 Flash-Lite Preview (Sep '25) (Reasoning) AA-Omniscience Accuracy18.0%
Artificial AnalysisGemini 2.5 Flash-Lite Preview (Sep '25) (Reasoning) AA-Omniscience Non-Hallucination Rate12.2%
Artificial AnalysisGemini 2.5 Flash-Lite Preview (Sep '25) (Reasoning) AIME 202568.7%
Artificial AnalysisGemini 2.5 Flash-Lite (Reasoning) Intelligence Index8.5
Artificial AnalysisGemini 2.5 Flash-Lite (Reasoning) Math Index53.3
Artificial AnalysisGemini 2.5 Flash-Lite (Reasoning) GPQA Diamond62.5%
Artificial AnalysisGemini 2.5 Flash-Lite (Reasoning) HLE6.8%
Artificial AnalysisGemini 2.5 Flash-Lite (Reasoning) IFBench49.9%
Artificial AnalysisGemini 2.5 Flash-Lite (Reasoning) τ²-Bench Telecom18.4%
Artificial AnalysisGemini 2.5 Flash-Lite (Reasoning) AA-LCR55.7%
Artificial AnalysisGemini 2.5 Flash-Lite (Reasoning) CritPt0.0%
Artificial AnalysisGemini 2.5 Flash-Lite (Reasoning) LiveCodeBench59.3%
Artificial AnalysisGemini 2.5 Flash-Lite (Reasoning) Terminal-Bench Hard4.5%
Artificial AnalysisGemini 2.5 Flash-Lite (Reasoning) MMLU-Pro75.9%
Artificial AnalysisGemini 2.5 Flash-Lite (Reasoning) AA-Omniscience Accuracy17.9%
Artificial AnalysisGemini 2.5 Flash-Lite (Reasoning) AA-Omniscience Non-Hallucination Rate22.6%
Artificial AnalysisGemini 2.5 Flash-Lite (Reasoning) AIME 202553.3%
Artificial AnalysisGemini 2.5 Flash-Lite (Reasoning) AIME70.3%
Artificial AnalysisGemini 2.5 Flash-Lite (Reasoning) MATH-50096.9%
Artificial AnalysisGemini 2.5 Flash-Lite Preview (Sep '25) (Non-reasoning) Intelligence Index9.3
Artificial AnalysisGemini 2.5 Flash-Lite Preview (Sep '25) (Non-reasoning) Math Index46.7
Artificial AnalysisGemini 2.5 Flash-Lite Preview (Sep '25) (Non-reasoning) GPQA Diamond65.1%
Artificial AnalysisGemini 2.5 Flash-Lite Preview (Sep '25) (Non-reasoning) HLE5.1%
Artificial AnalysisGemini 2.5 Flash-Lite Preview (Sep '25) (Non-reasoning) IFBench41.8%
Artificial AnalysisGemini 2.5 Flash-Lite Preview (Sep '25) (Non-reasoning) τ²-Bench Telecom30.4%
Artificial AnalysisGemini 2.5 Flash-Lite Preview (Sep '25) (Non-reasoning) AA-LCR49.7%
Artificial AnalysisGemini 2.5 Flash-Lite Preview (Sep '25) (Non-reasoning) CritPt0.0%
Artificial AnalysisGemini 2.5 Flash-Lite Preview (Sep '25) (Non-reasoning) LiveCodeBench64.1%
Artificial AnalysisGemini 2.5 Flash-Lite Preview (Sep '25) (Non-reasoning) Terminal-Bench Hard7.6%
Artificial AnalysisGemini 2.5 Flash-Lite Preview (Sep '25) (Non-reasoning) MMLU-Pro79.6%
Artificial AnalysisGemini 2.5 Flash-Lite Preview (Sep '25) (Non-reasoning) AA-Omniscience Accuracy14.1%
Artificial AnalysisGemini 2.5 Flash-Lite Preview (Sep '25) (Non-reasoning) AA-Omniscience Non-Hallucination Rate33.9%
Artificial AnalysisGemini 2.5 Flash-Lite Preview (Sep '25) (Non-reasoning) AIME 202546.7%
Vals AIGemini 2.5 Flash Lite (Nonthinking) MedCode27.1%
Vals AIGemini 2.5 Flash Lite (Nonthinking) MedScribe72.8%
Vals AIGemini 2.5 Flash Lite (Nonthinking) SAGE27.5%

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.

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.

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

Documentation

Guides, cookbooks, blog posts, and tools for building with Google: Gemini 2.5 Flash Lite on OpenRouter.

  • Gemini 2.5 Flash API - Pricing, Quickstart & Provider ComparisonBlog post

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P50, best provider

AutoExacto benchmarks
GPQA DiamondTAU-BenchGoogle AI Studio59.5%51.7%Google Vertex56.9%53.3%auto-routing54.7%53.4%Google Vertex56.1%42.3%
Uptime (3d)The model was reachable. Request routed to a provider.
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Availability (3d)The model returned inference from any provider. Errors and empty responses count against it.
99.67%

Availability over the last 3 days

Last 72 hours
Availability 99.67%
3 Days Ago2 Days AgoYesterdayNow

Availability over the last 24 hours

OpenRouter Availability
99.62%

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.

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Frequently asked questions

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.

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.

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.

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

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.

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

Gemini 4 Argon, Nano Banana 2.1, Gemini 3.8 Flash and 26 more are other text models from Google.

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