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Google: Gemini 2.5 Flash Preview 09-2025

google/gemini-2.5-flash-preview-09-2025

Gemini 2.5 Flash Preview September 2025 Checkpoint 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
Context
1.0M
Released
Sep 25, 2025
Knowledge Cutoff
Jan 2025
ActivityDocumentationFAQExplore

Activity

Token volume and request traffic to this model over time.

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 Preview 09-2025 on OpenRouter.

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

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Frequently asked questions

Gemini 2.5 Flash Preview September 2025 Checkpoint 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.

The Gemini 2.5 Flash Preview 09-2025 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 Preview 09-2025 has a 1,048,576 token context window.

Gemini 2.5 Flash Preview 09-2025 accepts images, files such as PDFs, text, audio, and video as input and returns text.

Gemini 4 Argon, Nano Banana 2.1, Gemini 3.8 Flash and 27 more are other text models from Google.

Gemini 2.5 Flash Preview 09-2025 was released on September 25, 2025. Its knowledge cutoff is January 31, 2025.