LongCat 2.5 Preview Free API
About
Build advanced reasoning agents with LongCat 2.5 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 LongCat 2.5 Preview Free via the OpenCode Go API with up to 131K output tokens.
Capabilities
Input Modalities
textimage
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
131K
Tokens
Pricing
Standard (per 1M tokens)
Input
Free
Output
Free
Caching (per 1M tokens)
Read
Free
Frequently Asked Questions
LongCat 2.5 Preview Free by OpenCode Go costs Free per 1M input tokens and Free per 1M output tokens. Cached reads cost Free per 1M tokens.
Model Details
ID
longcat-2.5-preview-free
Provider
OpenCode GoFamily
longcat
Release Date
Sep 25, 2026
Knowledge Cutoff
N/A
API Integration
NPM Package
@ai-sdk/openai-compatible
Environment Variables
OPENCODE_API_KEY
API Base URL
https://opencode.ai/inference/go/openai/v1