# Claude Fable 5.2

> Anthropic's Claude Fable 5.2 is a frontier model for the most demanding technical work, with gains over Fable 5.1 in coding, reasoning and vision. It supports text and image input, a 1M-token context window, 128K max output, and adaptive thinking (always on, default high effort). Announced 2026-11-09.

**ID**: `anthropic/claude-fable-5-2`  
**Creator**: Anthropic  
**Category**: multimodal  
**Context**: 1M tokens  
**Pricing**: $8.00 / $40.00 per 1M · billed by your provider (BYOK)  
**Released**: 2026-11-09  
**Web page**: https://anyrouter.dev/model/anthropic/claude-fable-5-2

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

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

**Aliases**: `claude-fable-5-2`, `claude-fable-5.2`, `anthropic/claude-fable-5.2`

## 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-5-2",
  "messages": [
    {
      "role": "user",
      "content": "Say hi in 3 words."
    }
  ]
}'
```

## Providers

| Provider | Input | Output |
| --- | --- | --- |
| anthropic-byok | $8.00/M (list) | $40.00/M (list) |
| anthropic-bedrock-byok | $8.00/M (list) | $40.00/M (list) |
| anthropic-vertex-byok | $8.00/M (list) | $40.00/M (list) |
| anthropic-foundry-byok | $8.00/M (list) | $40.00/M (list) |
| openrouter-byok | $8.00/M (list) | $40.00/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://www.anthropic.com/claude-fable-and-mythos-5-2