# Claude Sonnet 4.5

> Anthropic's Claude Sonnet 4.5 balances speed and intelligence for demanding text, coding, and research tasks at a practical cost point.

**ID**: `anthropic/claude-sonnet-4.5`  
**Creator**: Anthropic  
**Category**: text  
**Context**: 1M tokens  
**Pricing**: $3.00 / $15.00 per 1M · billed by your provider (BYOK)  
**Released**: 2025-09-29  
**Web page**: https://anyrouter.dev/model/anthropic/claude-sonnet-4.5

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

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

**Aliases**: `claude-sonnet-4-5`, `anthropic/claude-sonnet-4-5`, `claude-sonnet-4-5-20250929`, `anthropic/claude-sonnet-4-5-20250929`

## 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": "anthropic/claude-sonnet-4.5",
  "messages": [
    {
      "role": "user",
      "content": "Say hi in 3 words."
    }
  ]
}'
```

## Providers

| Provider | Input | Output |
| --- | --- | --- |
| anthropic-byok | $3.00/M (list) | $15.00/M (list) |
| openrouter-byok | $3.00/M (list) | $15.00/M (list) |
| opencode-zen-byok | $3.00/M (list) | $15.00/M (list) |
| cline-byok | $3.00/M (list) | $15.00/M (list) |
| router-byok | $3.00/M (list) | $15.00/M (list) |
| vercel-byok | $3.00/M (list) | $15.00/M (list) |

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