# Doubao Seed 2.1 Pro 260628

> Doubao Seed 2.1 Pro (build 260628) is a ByteDance Seed reasoning model with strong performance on coding, mathematics, and multilingual tasks. Serves via AIHubMix BYOK.

**ID**: `bytedance-seed/doubao-seed-2-1-pro-260628`  
**Creator**: bytedance-seed  
**Category**: text  
**Context**: 262K tokens  
**Input**: $0  
**Output**: $0  
**Released**: 2026-06-28  
**Web page**: https://anyrouter.dev/model/bytedance-seed/doubao-seed-2-1-pro-260628

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

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

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

**Aliases**: `bytedance-seed/doubao-seed-2-1-pro-260628`

## 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": "bytedance-seed/doubao-seed-2-1-pro-260628",
  "messages": [
    {
      "role": "user",
      "content": "Say hi in 3 words."
    }
  ]
}'
```

## Providers

| Provider | Input | Output |
| --- | --- | --- |
| aihubmix-byok | $0 | $0 |

## Source

- Upstream docs: https://aihubmix.com/models