What is the context window of XingChen: Xing4.0 29B A4B (free)?

XingChen: Xing4.0 29B A4B (free) supports a context window of 262K tokens.

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

Yes, XingChen: Xing4.0 29B A4B (free) is free to use via OpenRouter. Rate limits apply (typically 20 requests/minute or 200 per day on free endpoints).

How is LLM API pricing calculated?

LLM pricing has two components: input tokens (everything you send) and output tokens (what the model generates). Total cost = (prompt tokens × input rate + output tokens × output rate) / 1,000,000 × number of requests.

XingChen: Xing4.0 29B A4B (free) API Pricing — Free Input / Free Output per 1M Tokens

Q: How much does XingChen: Xing4.0 29B A4B (free) cost?

XingChen: Xing4.0 29B A4B (free) costs Free per million input tokens and Free per million output tokens via OpenRouter. Pricing was last updated Oct 29, 2026.

XingChen: Xing4.0 29B A4B (free) by Xingchen Agi — Free input / Free output per 1M tokens via OpenRouter. Context: 262K tokens. Pricing last updated Oct 29, 2026.

Input / 1M tokens

Free

Output / 1M tokens

Free

Provider

Xingchen Agi

Context window

262K tokens

Via

OpenRouter

Cost at common usage volumes

Usage	Daily	Monthly
Chatbot (100/day)	Free	Free
Small app (1K/day)	Free	Free
Mid-scale (10K/day)	Free	Free
Large scale (100K/day)	Free	Free

Model ID: xingchen-agi/xing4.0-29b-a4b:free
Data source: OpenRouter public API — updated Oct 29, 2026. Inference is free on OpenRouter (rate limits apply).

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

XingChen: Xing4.0 29B A4B (free) is an LLM developed by Xingchen Agi. It is free to use via OpenRouter (subject to rate limits). It supports a context window of 262K tokens.

Pricing Details

Via the OpenRouter API:

Input tokens: Free per 1 million tokens
Output tokens: Free per 1 million tokens

A token is roughly 0.75 words. For context: a typical user message of 100 words is approximately 133 tokens; a 500-word system prompt is about 650 tokens.

How Much Does XingChen: Xing4.0 29B A4B (free) Cost?

For a typical chatbot application (1,000 requests/day, 1,000 prompt tokens and 500 output tokens per request):

Daily cost: Free
Monthly cost: Free

Accessing XingChen: Xing4.0 29B A4B (free) via OpenRouter

OpenRouter provides a unified API for 200+ LLMs including XingChen: Xing4.0 29B A4B (free). You can use it with any OpenAI-compatible SDK by setting the base URL to https://openrouter.ai/api/v1 and using your OpenRouter API key. The model ID is xingchen-agi/xing4.0-29b-a4b:free.

Compare XingChen: Xing4.0 29B A4B (free) with Other Models

Use the AI Model Cost Comparison tool to compare XingChen: Xing4.0 29B A4B (free) against GPT-4o, Claude 3.5 Sonnet, Gemini 1.5 Pro, or any other model side by side. Or use the LLM API Cost Calculator to browse all 456+ models sorted by cost for your specific usage.

Frequently Asked Questions

Yes. XingChen: Xing4.0 29B A4B (free) is available on OpenRouter with the model ID xingchen-agi/xing4.0-29b-a4b:free. OpenRouter provides a unified API compatible with OpenAI's SDK format.