Gemini 3 Flash Preview Free API
About
Build advanced reasoning agents with Gemini 3 Flash Preview Free, a specialized AI model optimized for complex logic and chain-of-thought tasks. This model delivers available completely free of charge, native tool calling support. Access Gemini 3 Flash Preview Free via the ZenMux API with up to 64K output tokens.
Capabilities
Input Modalities
textimageaudio
Output Modalities
text
Reasoning
Yes
Structured Output
No
Tool Use
Yes
WeightsClosed
Temperature
Adjustable
Attachment
Supported
Limits
Context Window
1.0M
Tokens
Input Limit
1.0M
Tokens
Max Output
64K
Tokens
Pricing
Standard (per 1M tokens)
Input
Free
Output
Free
Frequently Asked Questions
Gemini 3 Flash Preview Free by ZenMux costs Free per 1M input tokens and Free per 1M output tokens.
Model Details
ID
google/gemini-3-flash-preview-free
Provider
ZenMuxFamily
Release Date
Dec 17, 2025
Knowledge Cutoff
Jan 1, 2025
API Integration
NPM Package
@ai-sdk/openai-compatible
Environment Variables
ZENMUX_API_KEY
API Base URL
https://zenmux.ai/api/v1