> ## Documentation Index
> Fetch the complete documentation index at: https://docs.unifically.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Claude Fable 5.2

> Anthropic's Claude Fable 5.2 language model. See supported inputs, parameters, pricing, response fields, and API examples.

Claude Fable 5.2 is Anthropic's top Claude model, released November 9, 2026, built for long-horizon agentic coding, multistep research, and document, spreadsheet, and slide work. It is up to 30% faster than Claude Fable 5.1. It takes text and image input, outputs text, and carries a 1M token context window with up to 128k output tokens. Adaptive thinking is always on.

Try it in the browser: [Claude Fable 5.2 API playground](https://unifically.com/models/claude-fable-5.2).

## Model

```
anthropic/claude-fable-5-2
```

| | |
| - | - |
| **Provider** | Anthropic |
| **Name** | Claude Fable 5.2 |
| **Context window** | 1M tokens |
| **Max output** | 128k tokens |

## Supported Endpoints

All three API formats are supported:

* [Chat Completions](https://docs.unifically.com/api-reference/v1-chat-completions.md) — `POST /v1/chat/completions`
* [Responses](https://docs.unifically.com/api-reference/v1-responses.md) — `POST /v1/responses`
* [Messages](https://docs.unifically.com/api-reference/v1-messages.md) — `POST /v1/messages`

> [!CAUTION]
>
> **Send LLM requests to `https://direct-api.unifically.com`, not `https://api.unifically.com`.** The main host sits behind Cloudflare, and Cloudflare's proxy timeout cuts most LLM requests short before the model has finished writing. When that happens you receive a truncated reply and are still charged for every token generated up to the cut-off. `direct-api.unifically.com` reaches the same API without the Cloudflare proxy, so long responses complete in full.

## Example

```bash theme={null}
curl -X POST https://direct-api.unifically.com/v1/messages \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{
    "model": "anthropic/claude-fable-5-2",
    "max_tokens": 4096,
    "messages": [
      {"role": "user", "content": "Plan the migration of this service from Python to Rust, then list the first three changes to make."}
    ]
  }'
```

> [!NOTE]
>
> Thinking cannot be turned off on this model. Forced tool use (`tool_choice` set to `any` or a named tool) is not supported, so keep `tool_choice` on `auto` and name the tool in the prompt. Leave out `temperature`, `top_p`, and `top_k`. Thinking blocks are bound to the model that produced them, so keep conversation history append-only.

> [!NOTE]
>
> **Volume discounts** are available for almost all models. Reach out at [contact@unifically.com](mailto:contact@unifically.com) to discuss custom pricing.


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