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Gemini 2.5 Flash Lite Preview 09-25

gemini-flash-lite Reasoning Tool Calling Attachments Structured Output

Gemini 2.5 Flash-Lite is a lightweight reasoning model in the Gemini 2.5 family, optimized for ultra-low latency and cost efficiency. It offers improved throughput, faster token generation, and better performance across common benchmarks compared to earlier Flash models. By default, "thinking" (i.e. multi-pass reasoning) is disabled to prioritize speed, but developers can enable it via the [Reasoning API parameter](https://openrouter.ai/docs/use-cases/reasoning-tokens) to selectively trade off cost for intelligence.

Providers 4
Released Sep 25, 2025
Input Modalities text, image, audio, video, pdf
Output Modalities text
Tarsk Use coding

Benchmarks

19.4
Intelligence Index
14.5
Coding Index
46.7
Math Index

Available Providers (4)

Provider Model ID Input Cost Output Cost Context Max Output Docs
OpenRouter google/gemini-2.5-flash-lite-preview-09-2025 $0.10/MTok $0.40/MTok 1.0M 65.5K
Vertex gemini-2.5-flash-lite-preview-09-2025 $0.10/MTok $0.40/MTok 1.0M 65.5K
Google gemini-2.5-flash-lite-preview-09-2025 $0.10/MTok $0.40/MTok 1.0M 65.5K
Vercel AI Gateway google/gemini-2.5-flash-lite-preview-09-2025 $0.10/MTok $0.40/MTok 1.0M 65.5K

Capabilities

Reasoning
Tool Calling
Attachments
Open Weights
Structured Output