# Claude Fable 5.1

> Anthropic's Claude Fable 5.1 is the successor to Claude Fable 5 for long-running agentic coding, knowledge work, and research. Same $10/$50 list rates as Fable 5, with cache reads at $0.25 per million tokens and a 1M-token context window.

**ID**: `anthropic/claude-fable-5.1`  
**Creator**: Anthropic  
**Category**: text  
**Context**: 1M tokens  
**Pricing**: $10.00 / $50.00 per 1M · billed by your provider (BYOK)  
**Released**: 2026-09-01  
**Web page**: https://anyrouter.dev/model/anthropic/claude-fable-5.1

**Input modalities**: text, image  
**Output modalities**: text  

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

**Aliases**: `claude-fable-5-1`, `claude-fable-5.1`, `anthropic/claude-fable-5-1`

## 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-fable-5.1",
  "messages": [
    {
      "role": "user",
      "content": "Say hi in 3 words."
    }
  ]
}'
```

## Providers

| Provider | Input | Output |
| --- | --- | --- |
| anthropic-byok | $10.00/M (list) | $50.00/M (list) |
| aihubmix-byok | $11.00/M (list) | $55.00/M (list) |
| openrouter-byok | $10.00/M (list) | $50.00/M (list) |
| experiential-byok | $10.00/M (list) | $50.00/M (list) |
| router-byok | $10.00/M (list) | $50.00/M (list) |
| vercel-byok | $10.00/M (list) | $50.00/M (list) |

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

## Source

- Upstream docs: https://developers.cloudflare.com/ai/models/anthropic/claude-fable-5.1/