Xing4.0 29B A4B (free) API
About
Build advanced reasoning agents with Xing4.0 29B A4B (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, open weights architecture. Access Xing4.0 29B A4B (free) via the OpenRouter API with up to 236K output tokens.
Capabilities
Input Modalities
text
Output Modalities
text
Reasoning
Yes
Structured Output
Yes
Tool Use
Yes
WeightsOpen
Limits
Context Window
262K
Tokens
Input Limit
262K
Tokens
Max Output
236K
Tokens
Pricing
Standard (per 1M tokens)
Input
Free
Output
Free
Frequently Asked Questions
Xing4.0 29B A4B (free) by OpenRouter costs Free per 1M input tokens and Free per 1M output tokens.
Model Details
ID
xingchen-agi/xing4.0-29b-a4b:free
Provider
OpenRouterFamily
agi
Release Date
Oct 16, 2026
Knowledge Cutoff
N/A
API Integration
NPM Package
@openrouter/ai-sdk-provider
Environment Variables
OPENROUTER_API_KEY
API Base URL
https://openrouter.ai/api/v1