XingChen: Xing4.0 29B A4B (free) Free API on OpenRouter

Free API Verified

Available from OpenRouter

Catalog profile Reasoning provider catalog metadata

Free provider route for experiments, demos, and cost-sensitive chat workloads

Free APIOpenAI compatibleReasoningTool callingJSON modeTextReasoning

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API Details

Copy-ready connection details

Use these values in your client or SDK.

Base URL

https://openrouter.ai/api/v1

Model ID

xingchen-agi/xing4.0-29b-a4b:free

API format OpenAI Chat Completions + OpenAI Responses

Technical Details

XingChen: Xing4.0 29B A4B (free) specifications

Provider catalog

Context window 262K

Max output 236K

Status Online

Released Oct 16, 2026

Last updated Oct 18, 2026

Free listing since Oct 16, 2026

Input text, reasoning

Output text

Capabilities reasoning, tool calling, structured output

AI Recommendation

Should you use XingChen: Xing4.0 29B A4B (free)?

XingChen: Xing4.0 29B A4B (free) is listed for chat workloads and supports a 262K context window.

Use it when OpenRouter's free tier is enough for evaluation, demos, or light production traffic.

Best for

Chat

Strengths & Weaknesses

Strengths

Long context window
Reasoning mode listed
Tool calling support
Structured JSON output

Watch outs

Free-tier rate limits apply
Vision support is not listed

Benchmark Overview

Benchmark signals for XingChen: Xing4.0 29B A4B (free)

Measured data

Speed Observed generation speed

9 tok/s

Context Maximum listed context window

262K

Pricing

XingChen: Xing4.0 29B A4B (free) pricing per 1M tokens

Free tier listed

Input $0 per 1M tokens

Output $0 per 1M tokens

Access Available OpenRouter

Rate limit 200 req/day (free tier) provider policy

Availability

XingChen: Xing4.0 29B A4B (free) availability by provider

Current provider only

We only found this XingChen: Xing4.0 29B A4B (free) listing on OpenRouter in the current catalog. Use the related models section for nearby alternatives.

Provider	Model listing	Access	Context	API	Limits
OpenRouter	XingChen: Xing4.0 29B A4B (free)	Free tier	262K	OpenAI-style	200 req/day (free tier)

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Compare

XingChen: Xing4.0 29B A4B (free) alternatives to consider

Open comparison

Model	Provider	Context	Access
NVIDIA: Nemotron 3.5 Super VL (free)	OpenRouter	1.0M	Free tier
Dots Studio: Dots3-Note Preview (free)	OpenRouter	512K	Free tier
LiquidAI: LFM2.5-2.6B (free)	OpenRouter	66K	Free tier
NVIDIA: Nemotron 3.5 Lightning (free)	OpenRouter	1.0M	Free tier
Thinking Machines: Inkling Small (free)	OpenRouter	1.0M	Free tier

Typical Use Cases

XingChen: Xing4.0 29B A4B (free) use cases

Chat

XingChen: Xing4.0 29B A4B (free) is tagged for chat in this catalog and works with OpenAI-compatible client libraries.

FAQ

XingChen: Xing4.0 29B A4B (free) free API FAQ

Is XingChen: Xing4.0 29B A4B (free) free to use?

XingChen: Xing4.0 29B A4B (free) is listed with free API access on OpenRouter, subject to the provider's quota and account policy.

What is the XingChen: Xing4.0 29B A4B (free) model ID?

The model ID shown in this catalog is xingchen-agi/xing4.0-29b-a4b:free.

What are the XingChen: Xing4.0 29B A4B (free) free tier rate limits on OpenRouter?

The listed free tier limit is 200 req/day (free tier). Limits can change per account tier, so confirm against the provider dashboard.

What context window does XingChen: Xing4.0 29B A4B (free) support?

The listed context window is 262K tokens with up to 236K output tokens.

More about XingChen: Xing4.0 29B A4B (free)