# Xing4.0 29B A4B

> Xing4.0-29B-A4B is an open-weight mixture-of-experts reasoning model from China Telecom's TeleAI (the Xing line, formerly TeleChat). It activates 4B of 29B parameters per token, supports a 256K context, and targets agentic coding, tool calling and long-context engineering tasks.

**ID**: `xingchen-agi/xing4.0-29b-a4b`  
**Creator**: xingchen-agi  
**Category**: text  
**Context**: 262K tokens  
**Pricing**: BYOK — billed by your provider  
**Released**: 2026-09-16  
**Web page**: https://anyrouter.dev/model/xingchen-agi/xing4.0-29b-a4b

**Input modalities**: text  
**Output modalities**: text  

**Capabilities**: chat, streaming, reasoning, function-calling, coding

**Supported parameters**: max_tokens, temperature, top_p, stop, tools, tool_choice

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

## Usage

**Endpoint**: `POST https://anyrouter.dev/api/v1/chat/completions`

```bash
curl https://anyrouter.dev/api/v1/chat/completions \
  -H "Authorization: Bearer $ANYROUTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "xingchen-agi/xing4.0-29b-a4b",
  "messages": [
    {
      "role": "user",
      "content": "Say hi in 3 words."
    }
  ]
}'
```

## Providers

| Provider | Input | Output |
| --- | --- | --- |
| hue | $0 | $0 |
| openrouter-byok | BYOK — billed by your provider | — |

BYOK routes are billed by your own provider key — AnyRouter charges $0. Rates marked (list) are the provider's published list price.

## Model card

- Architecture: mixture of experts [1]
- Total parameters: 29B [1]
- Active parameters: 4B [1]
- Native context: 262144 tokens [1]
- License: Apache-2.0, open weights (https://huggingface.co/XingChen-AGI/Xing4.0-29B-A4B) [1]

### Strengths [1]

- Agent-oriented MLA + MTP design for multi-step planning and tool calling
- 256K native context, extensible to 512K

### Use cases [1]

- Agentic coding and terminal tasks
- Long-context document and contract work

### Links

- model card: https://huggingface.co/XingChen-AGI/Xing4.0-29B-A4B

### Sources

1. [Xing4.0-29B-A4B model card](https://huggingface.co/XingChen-AGI/Xing4.0-29B-A4B) (accessed 2026-10-17)

## Source

- Upstream docs: https://huggingface.co/XingChen-AGI/Xing4.0-29B-A4B