# Claude Fable 5.2

## Best for

The hardest coding, reasoning, and vision work, where capability matters more than cost

## When not to use

Zero data retention. Audio or video input. Not Opus 5.5 for everyday workloads that do not need Fable's extra depth. Call it as `claude-fable-5.2`.

## Overview

Non-ZDR: upstream providers may retain prompts and outputs.

Claude Fable 5.2 is Anthropic's most capable model for demanding technical work, with gains over Fable 5.1 in coding, reasoning, and vision. It supports adaptive thinking, tool use, and image input, with a 1,000,000-token context window, and costs less per token than Fable 5.1.

| | |
| --- | --- |
| API identifier | `anthropic/claude-fable-5.2` |
| Developer | Anthropic |
| Context window | 1,000,000 tokens |
| Supports | text, reasoning, tool-use, image input, vision |
| Status | Serving |

## Rates

USD per 1M tokens, on-demand tier.

| Input | Cached input | Output |
| --- | --- | --- |
| $8.00 | $0.20 | $40.00 |

## Call it

Put `anthropic/claude-fable-5.2` in the `model` field. The same request works against the Anthropic Messages API — see [API Compatibility](https://inference.boundless.network/docs/api-compatibility).

```bash
curl https://api.inference.boundless.network/v1/chat/completions \
  -H "Authorization: Bearer $BOUNDLESS_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "anthropic/claude-fable-5.2",
    "messages": [{
      "content": "Say hello",
      "role": "user"
    }]
  }'
```

Every model we serve is listed at [Models](https://inference.boundless.network/models); the rate card in full is on [Pricing](https://inference.boundless.network/docs/pricing).