Author's Description
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. Note: This model is available in two variants: thinking and non-thinking. The output pricing varies significantly depending on whether the thinking capability is active. If you select the standard variant (without the ":thinking" suffix), the model will explicitly avoid generating thinking tokens. To utilize the thinking capability and receive thinking tokens, you must choose the ":thinking" variant, which will then incur the higher thinking-output pricing. 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-reasoning).
Key Specifications
Supported Parameters
This model supports the following parameters:
Features
This model supports the following features:
Performance Summary
Google's Gemini 2.5 Flash Preview 04-17 demonstrates strong performance as a state-of-the-art workhorse model. It performs among the fastest models, typically ranking in the top tier for speed (75th percentile). The model also offers competitive pricing, generally providing cost-effective solutions (67th percentile). A standout feature is its exceptional reliability, achieving a perfect 100% success rate across all benchmarks, indicating consistent and dependable operation. In terms of specific benchmarks, Gemini 2.5 Flash excels in classification tasks, achieving perfect 100% accuracy in Email Classification, making it the most accurate model at its price point and among models of similar speed. It also shows strong performance in General Knowledge (99.3% accuracy) and Ethics (99.0% accuracy), demonstrating its advanced reasoning capabilities. While its Coding performance (83.0% accuracy) is solid, it is not as dominant as its classification or knowledge-based results. The model's configurable "thinking" capability, while impacting pricing, allows for enhanced accuracy and nuanced context handling, positioning it as a versatile tool for advanced reasoning, coding, mathematics, and scientific tasks.
Model Pricing
Current Pricing
Feature | Price (per 1M tokens) |
---|---|
Prompt | $0.15 |
Completion | $0.6 |
Input Cache Read | $0.0375 |
Input Cache Write | $0.233 |
Price History
Available Endpoints
Provider | Endpoint Name | Context Length | Pricing (Input) | Pricing (Output) |
---|---|---|---|---|
Google
|
Google | google/gemini-2.5-flash-preview-04-17 | 1M | $0.15 / 1M tokens | $0.6 / 1M tokens |
Google AI Studio
|
Google AI Studio | google/gemini-2.5-flash-preview-04-17 | 1M | $0.15 / 1M tokens | $0.6 / 1M tokens |
Benchmark Results
Benchmark | Category | Reasoning | Strategy | Free | Executions | Accuracy | Cost | Duration |
---|
Other Models by google
|
Released | Params | Context |
|
Speed | Ability | Cost |
---|---|---|---|---|---|---|---|
Google: Gemini 2.5 Flash Preview 09-2025 | Sep 25, 2025 | — | 1M |
Text input
Image input
File input
Text output
|
★★★★ | ★★★★★ | $$$$ |
Google: Gemini 2.5 Flash Lite Preview 09-2025 | Sep 25, 2025 | — | 1M |
Text input
Image input
File input
Audio input
Text output
|
★★★★★ | ★★★★ | $$$ |
Google: Gemini 2.5 Flash Image Preview (Nano Banana) | Aug 26, 2025 | — | 32K |
Text input
Image input
Text output
Image output
|
— | — | $$$$$ |
Google: Gemini 2.5 Flash Lite | Jul 22, 2025 | — | 1M |
Text input
Image input
File input
Audio input
Text output
|
★★★★★ | ★★★ | $$$ |
Google: Gemini 2.5 Flash Lite Preview 06-17 | Jun 17, 2025 | — | 1M |
Text input
Image input
File input
Audio input
Text output
|
★★★★ | ★★★ | $$$ |
Google: Gemini 2.5 Flash | Jun 17, 2025 | — | 1M |
Text input
Image input
File input
Audio input
Text output
|
★★★★ | ★★★★ | $$$$$ |
Google: Gemini 2.5 Pro | Jun 17, 2025 | — | 1M |
Text input
Image input
File input
Audio input
Text output
|
★ | ★★★★★ | $$$$$ |
Google: Gemini 2.5 Pro Preview 06-05 | Jun 05, 2025 | — | 1M |
Text input
Image input
File input
Audio input
Text output
|
★ | ★★★★★ | $$$$$ |
Google: Gemma 1 2B Unavailable | May 28, 2025 | 2B | 8K |
Text input
Text output
|
— | — | $$ |
Google: Gemma 3n 4B | May 20, 2025 | 4B | 32K |
Text input
Text output
|
★★★ | ★★★ | $ |
Google: Gemini 2.5 Flash Preview 05-20 Unavailable | May 20, 2025 | — | 1M |
Text input
Image input
File input
Text output
|
★★★★ | ★★★★ | $$$ |
Google: Gemini 2.5 Pro Preview 05-06 | May 06, 2025 | — | 1M |
Text input
Image input
File input
Audio input
Text output
|
★ | ★★★★★ | $$$$$ |
Google: Gemini 2.5 Pro Experimental Unavailable | Mar 25, 2025 | — | 1M |
Text input
Image input
File input
Text output
|
— | — | $ |
Google: Gemma 3 4B | Mar 13, 2025 | 4B | 131K |
Text input
Image input
Text output
|
★★★ | ★★ | $$ |
Google: Gemma 3 12B | Mar 13, 2025 | 12B | 131K |
Text input
Image input
Text output
|
★★★ | ★★ | $$ |
Google: Gemma 3 27B | Mar 11, 2025 | 27B | 131K |
Text input
Image input
Text output
|
★★★ | ★★★ | $$ |
Google: Gemini 2.0 Flash Lite | Feb 25, 2025 | — | 1M |
Text input
Image input
File input
Audio input
Text output
|
★★★★★ | ★★ | $$ |
Google: Gemini 2.0 Flash | Feb 05, 2025 | — | 1M |
Text input
Image input
File input
Audio input
Text output
|
★★★★★ | ★★★ | $$ |
Google: Gemini 1.5 Flash 8B Unavailable | Oct 02, 2024 | ~500B | 1M |
Text input
Image input
Text output
|
★★★★★ | ★★ | $ |
Google: Gemma 2 27B | Jul 12, 2024 | 27B | 8K |
Text input
Text output
|
★★★★ | ★★ | $$$$ |
Google: Gemma 2 9B | Jun 27, 2024 | 9B | 8K |
Text input
Text output
|
★★★ | ★ | $$ |
Google: Gemini 1.5 Flash Unavailable | May 13, 2024 | ~500B | 1M |
Text input
Image input
Text output
|
★★★★★ | ★★★ | $$ |
Google: Gemini 1.5 Pro Unavailable | Apr 08, 2024 | ~1T | 2M |
Text input
Image input
Text output
|
★★★★ | ★★★ | $$$$ |