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Gemini 3.5 Flash

Google DeepMindlegacyreasoning-llmGemini 3.5

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

ProviderModel idEndpoint / URLDocs
Gemini APIgemini-3.5-flashhttps://generativelanguage.googleapis.com/v1beta/models/gemini-3.5-flash:generateContentdocs
Google Cloud Gemini Enterprise Agent Platform (Vertex AI)gemini-3.5-flash—docs
OpenRoutergoogle/gemini-3.5-flash——

Notable capabilities (2)

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