# Google: Gemini 2.5 Flash Preview 09-2025: AI model fact sheet

- **Provider:** google
- **Released:** 2025-09-25
- **Context window:** 1,048,576 tokens
- **API pricing:** $0.30 / 1M input, $2.50 / 1M output
- **OpenRouter ID:** google/gemini-2.5-flash-preview-09-2025
- **Capabilities:** conversation, reasoning, code-generation, analysis

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 described in the documentation.

Source: real side-by-side outputs, pricing and specs at https://rival.tips/models/gemini-2.5-flash-preview-09-2025