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OpenCode Zen

Gemini 3.1 Pro Preview API

OpenCode Zen
About

Build advanced reasoning agents with Gemini 3.1 Pro Preview, a specialized AI model optimized for complex logic and chain-of-thought tasks. This model delivers cost-effective pricing at $2.00/1M input and $12.00/1M output tokens, native tool calling support. Access Gemini 3.1 Pro Preview via the OpenCode Zen API with up to 66K output tokens.

Capabilities

Input Modalities

textimagevideoaudiopdf

Output Modalities

text
Reasoning
Yes
Structured Output
Yes
Tool Use
Yes
WeightsClosed
Temperature
Adjustable
Attachment
Supported
Limits
Context Window
1.0M

Tokens

Input Limit
1.0M

Tokens

Max Output
66K

Tokens

Pricing

Standard (per 1M tokens)

Input
$2.00
Output
$12.00

Caching (per 1M tokens)

Read
$0.20
Frequently Asked Questions

Gemini 3.1 Pro Preview by OpenCode Zen costs $2.00 per 1M input tokens and $12.00 per 1M output tokens. Cached reads cost $0.20 per 1M tokens.

Model Details
ID
gemini-3.1-pro
Provider
OpenCode Zen
Family
gemini-pro
Release Date
Feb 19, 2026
Knowledge Cutoff
Jan 1, 2025
API Integration
NPM Package
@ai-sdk/openai-compatible
Environment Variables
OPENCODE_API_KEY
API Base URL
https://opencode.ai/zen/v1
Documentation