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Google: Gemini 2.5 Flash Preview 09-2025

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

Created Sep 25, 20251,048,576 context
$0.30/M input tokens$2.50/M output tokens$1/M audio tokens

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-reasoning).

Recent activity on Gemini 2.5 Flash Preview 09-2025

Total usage per day on OpenRouter

Prompt
487M
Completion
25M
Reasoning
6.65M

Prompt tokens measure input size. Reasoning tokens show internal thinking before a response. Completion tokens reflect total output length.