# Gemini 2.5 Flash Preview 05-20: AI model fact sheet

- **Provider:** google
- **Released:** 2025-05-20
- **Context window:** 1,048,576 tokens
- **Parameters:** Not disclosed
- **API pricing:** $0.15 / 1M input, $0.60 / 1M output
- **OpenRouter ID:** google/gemini-2.5-flash-preview-05-20
- **Capabilities:** conversation, reasoning, code-generation, analysis

Gemini 2.5 Flash May 20th 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. 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.

Source: real side-by-side outputs, pricing and specs at https://rival.tips/models/gemini-2.5-flash-preview-05-20