Gemini 3.5 Flash
Launched at Google I/O 2026 as first Gemini 3.5 model. Model page lists gemini-3-flash-preview (Dec 2025) as its preview predecessor id; that preview is still served. Now more expensive than 3.6-3.8 Flash; use gemini-3.8-flash.
- Context window
- 1,048,576 tokens
- Max output
- 65,536 tokens
- Input
- text, image, audio, video, pdf
- Output
- text
- License
- proprietary
- Pricing
- input: $1.5 · output: $9 (per 1M tokens (Standard tier)) source
- Verified
- 2026-09-29
How to call it
| Provider | Model id | Endpoint / URL | Docs |
|---|---|---|---|
| Gemini API | gemini-3.5-flash | https://generativelanguage.googleapis.com/v1beta/models/gemini-3.5-flash:generateContent | docs |
| Google Cloud Gemini Enterprise Agent Platform (Vertex AI) | gemini-3.5-flash | — | docs |
| OpenRouter | google/gemini-3.5-flash | — | — |
Notable capabilities (2)
- Flash beats previous Pro on agents: Outperformed Gemini 3.1 Pro on Terminal-Bench 2.1 (76.2%), GDPval-AA (1656 Elo) and MCP Atlas (83.6%); 84.2% CharXiv Reasoning. source
- High output speed: Google claims ~4x the output tokens/second of other frontier models at launch. source
First model of the Gemini 3.5 generation (I/O, May 2026). Kept for compatibility; newer 3.6-3.8 Flash models are cheaper and stronger.
curl "https://generativelanguage.googleapis.com/v1beta/models/gemini-3.5-flash:generateContent" \
-H "x-goog-api-key: $GEMINI_API_KEY" -H "Content-Type: application/json" \
-d '{"contents":[{"parts":[{"text":"Hello"}]}]}'
Sources: model page, pricing, deprecations, I/O blog.
Other Google DeepMind models
Gemini 3.8 Flash TTS · Gemini 3.8 Live · Gemini 3.8 Flash · Gemini 3.5 Transcribe (and Transcribe Live) · Lyria 3.5 · Gemini 3.5 Flash-Lite · Nano Banana 2 Lite (Gemini 3.1 Flash-Lite Image) · Gemini Omni Flash (Omni 1.1 Flash) · Gemini Embedding 2 · Gemma 4 · Nano Banana 2 (Gemini 3.1 Flash Image) · Nano Banana Pro (Gemini 3 Pro Image) · Gemini Robotics 2 · Gemini Robotics ER 2 · Gemini Robotics On-Device 2 · Gemini 3.5 Live Translate · Gemini 3.1 Pro · Veo 3.1 · Genie 3 · Lyria RealTime · Gemini 3.7 Flash · Gemini 3.6 Flash · Gemini 3.1 Flash TTS (preview) · Gemini 3.1 Flash Live (preview) · Lyria 3 (Clip / Pro) · Lyria 2 · Gemini 2.5 Flash Native Audio (Live, preview) · Gemini 2.5 Flash-Lite · Gemini 2.5 Flash · Gemini 2.5 Pro · Gemini 2.5 Flash TTS / Pro TTS · Gemini 3.1 Flash-Lite · Nano Banana (Gemini 2.5 Flash Image) · Gemini Robotics-ER 1.5 / 1.6 · Imagen 4