Gemini 3.1 Flash Lite

Gemini 3.1 Flash-Lite is Google DeepMind's lowest-cost, lowest-latency model in the Gemini 3.1 series, generally available in 2026 and priced around $0.25/1M input and $1.50/1M output tokens. It is multimodal across text, image, video, audio and PDF input, and supports configurable thinking levels so developers can dial reasoning up or down per task. Google reports it improves on 2.5 Flash with roughly 2.5x faster time to first token and about 45% higher output speed. Ideal for high-volume, cost-sensitive work like translation, classification, content moderation, data extraction and large-scale agentic pipelines.

curl https://api.tunerouter.com/v1/chat/completions \
  -H "Authorization: Bearer $TUNEROUTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model": "gemini-3.1-flash-lite", "messages": [{"role": "user", "content": "Hello!"}]}'

Model ID: gemini-3.1-flash-lite · works with OpenAI SDKs — just point base_url at api.tunerouter.com