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Google: Gemini 2.5 Flash

google/gemini-2.5-flash

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Gemini 2.5 Flash is Google's state-of-the-art workhorse model, specifically designed for advanced reasoning, coding, mathematics, and scientific tasks. It includes built-in "thinking" capabilities, enabling it to provide responses with greater accuracy and nuanced context handling.

Additionally, Gemini 2.5 Flash is configurable through the "max tokens for reasoning" parameter, as described in the documentation (https://openrouter.ai/docs/use-cases/reasoning-tokens#max-tokens-for-reasoningOpens in new tab).

Modalities

In / Out Price

$0.30 / $2.50per 1M

Context

1.0M

Released

Jun 17, 2025

Knowledge Cutoff

Jan 2025

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ProvidersPricingPerformanceUptimeBenchmarksAppsActivityFAQExplore

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.

Benchmark score summary for Google: Gemini 2.5 Flash (Artificial Analysis and Design Arena)
SourceBenchmarkScore
Artificial AnalysisGemini 2.5 Flash (Non-reasoning) GPQA Diamond68.3%
Artificial AnalysisGemini 2.5 Flash (Non-reasoning) HLE4.7%
Artificial AnalysisGemini 2.5 Flash (Non-reasoning) IFBench39.0%
Artificial AnalysisGemini 2.5 Flash (Non-reasoning) τ²-Bench Telecom14.9%
Artificial AnalysisGemini 2.5 Flash (Non-reasoning) AA-LCR49.9%
Artificial AnalysisGemini 2.5 Flash (Non-reasoning) CritPt1.4%
Artificial AnalysisGemini 2.5 Flash (Non-reasoning) Terminal-Bench Hard12.1%
Artificial AnalysisGemini 2.5 Flash (Non-reasoning) AA-Omniscience Accuracy26.1%
Artificial AnalysisGemini 2.5 Flash (Non-reasoning) AA-Omniscience Non-Hallucination Rate7.0%
Artificial AnalysisGemini 2.5 Flash Preview (Non-reasoning) GPQA Diamond59.4%
Artificial AnalysisGemini 2.5 Flash Preview (Non-reasoning) HLE3.8%
Artificial AnalysisGemini 2.5 Flash (Reasoning) GPQA Diamond79.0%
Artificial AnalysisGemini 2.5 Flash (Reasoning) HLE12.1%
Artificial AnalysisGemini 2.5 Flash (Reasoning) IFBench50.3%
Artificial AnalysisGemini 2.5 Flash (Reasoning) τ²-Bench Telecom31.6%
Artificial AnalysisGemini 2.5 Flash (Reasoning) AA-LCR65.3%
Artificial AnalysisGemini 2.5 Flash (Reasoning) CritPt1.1%
Artificial AnalysisGemini 2.5 Flash (Reasoning) Terminal-Bench Hard13.6%
Artificial AnalysisGemini 2.5 Flash (Reasoning) AA-Omniscience Accuracy26.0%
Artificial AnalysisGemini 2.5 Flash (Reasoning) AA-Omniscience Non-Hallucination Rate24.7%
Artificial AnalysisGemini 2.5 Flash Preview (Sep '25) (Non-reasoning) GPQA Diamond76.6%
Artificial AnalysisGemini 2.5 Flash Preview (Sep '25) (Non-reasoning) HLE8.7%
Artificial AnalysisGemini 2.5 Flash Preview (Sep '25) (Non-reasoning) IFBench43.5%
Artificial AnalysisGemini 2.5 Flash Preview (Sep '25) (Non-reasoning) τ²-Bench Telecom28.4%
Artificial AnalysisGemini 2.5 Flash Preview (Sep '25) (Non-reasoning) AA-LCR60.0%
Artificial AnalysisGemini 2.5 Flash Preview (Sep '25) (Non-reasoning) CritPt0.0%
Artificial AnalysisGemini 2.5 Flash Preview (Sep '25) (Non-reasoning) Terminal-Bench Hard14.4%
Artificial AnalysisGemini 2.5 Flash Preview (Sep '25) (Non-reasoning) AA-Omniscience Accuracy26.8%
Artificial AnalysisGemini 2.5 Flash Preview (Sep '25) (Non-reasoning) AA-Omniscience Non-Hallucination Rate8.8%
Artificial AnalysisGemini 2.5 Flash Preview (Sep '25) (Reasoning) GPQA Diamond79.3%
Artificial AnalysisGemini 2.5 Flash Preview (Sep '25) (Reasoning) HLE13.8%
Artificial AnalysisGemini 2.5 Flash Preview (Sep '25) (Reasoning) IFBench52.3%
Artificial AnalysisGemini 2.5 Flash Preview (Sep '25) (Reasoning) τ²-Bench Telecom45.6%
Artificial AnalysisGemini 2.5 Flash Preview (Sep '25) (Reasoning) AA-LCR71.0%
Artificial AnalysisGemini 2.5 Flash Preview (Sep '25) (Reasoning) CritPt0.3%
Artificial AnalysisGemini 2.5 Flash Preview (Sep '25) (Reasoning) Terminal-Bench Hard16.7%
Artificial AnalysisGemini 2.5 Flash Preview (Sep '25) (Reasoning) AA-Omniscience Accuracy28.3%
Artificial AnalysisGemini 2.5 Flash Preview (Sep '25) (Reasoning) AA-Omniscience Non-Hallucination Rate10.1%
Artificial AnalysisGemini 2.5 Flash Preview (Reasoning) GPQA Diamond69.8%
Artificial AnalysisGemini 2.5 Flash Preview (Reasoning) HLE12.1%
Design ArenaGemini 2.5 Flash Preview 09-2025 Models Arena 3D Elo1099
Design ArenaGemini 2.5 Flash Preview 09-2025 Models Arena Code Categories Elo1119
Design ArenaGemini 2.5 Flash Preview 09-2025 Models Arena Data Visualization Elo1149
Design ArenaGemini 2.5 Flash Preview 09-2025 Models Arena Game Development Elo1089
Design ArenaGemini 2.5 Flash Preview 09-2025 Models Arena SVG Elo1038
Design ArenaGemini 2.5 Flash Preview 09-2025 Models Arena UI Component Elo1108
Design ArenaGemini 2.5 Flash Preview 09-2025 Models Arena Website Elo1127

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.

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Frequently asked questions

Gemini 2.5 Flash is Google's state-of-the-art workhorse model, specifically designed for advanced reasoning, coding, mathematics, and scientific tasks. It includes built-in "thinking" capabilities, enabling it to provide responses with greater accuracy and nuanced context handling.

Gemini 2.5 Flash costs $0.30/M input tokens and $2.50/M output tokens, with separate rates for Cache Read at $0.03/M tokens, Cache Write at $0.08333/M tokens, Image Input at $0.30/M tokens, Input Audio at $1.00/M tokens, and Input Audio Cache at $0.10/M tokens.

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

Yes. Gemini 2.5 Flash accepts tools and tool_choice for function calling. It also supports structured outputs via a JSON schema in response_format.

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

Gemini 2.5 Flash 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 2.5 Flash was released on June 17, 2025. Its knowledge cutoff is January 31, 2025.