---
title: Anthropic: Claude Fable 5.1 (batch) | Text Generation | ModelsLab
description: Build with Anthropic: Claude Fable 5.1 (batch) API by Anthropic. Text generation, chat, code, and reasoning. Plans from $21/month.
url: https://modelslab.com/models/anthropic/anthropic-claude-fable-5.1-batch.md
canonical: https://modelslab.com/models/anthropic/anthropic-claude-fable-5.1-batch
type: product
component: Playground/LLM/Index
generated_at: 2026-09-02T09:51:54.418955Z
---

Anthropic: Claude Fable 5.1 (batch)
---

 [LLMs.txt](https://modelslab.com/models/anthropic/anthropic-claude-fable-5.1-batch/llms.txt) [.md](https://modelslab.com/models/anthropic/anthropic-claude-fable-5.1-batch.md)

Anthropic: Claude Fable 5.1 (batch)
---

Choose a prompt below to get started or type your own message

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### Anthropic: Claude Fable 5.1 (batch)

anthropic anthropic-claude-fable-5.1-batch

Copy model ID

PricingInput $5.00 / 1M tokens

Output $25.00 / 1M tokens

API EndpointsOpenAI Compatible

`https://modelslab.com/api/v7/llm/chat/completions`Endpoint

Anthropic Compatible

`https://modelslab.com/api/v7/llm/v1/messages`Messages

`https://modelslab.com/api/v7/llm/v1/messages/count_tokens`Count Tokens

`https://modelslab.com/api/v7/llm/v1/models`Models

Use with Claude Code

cURL Example

ParametersSystem MessageYou are a helpful AI assistant specialized in providing accurate and detailed responses.

Temperature0.7

Max Tokens4000

Top P0.9

Frequency Penalty0

Presence Penalty0

Thinkinglow

lowmediumhigh

Deeper thinking spends more of the Max Tokens budget before the answer starts.

Model Info

Support

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About Anthropic: Claude Fable 5.1 (Batch)
---

Claude Fable 5.1 improves on Claude Fable 5 across the board, with the biggest gains in agentic coding, long-running agentic workflows, and knowledge work: long code refactors, front-end and visual...

### Technical Specifications

Model IDanthropic-claude-fable-5.1-batch

CategoryLLM Models

TaskText Generation

Price$15 per million tokens

AddedSeptember 2, 2026

### Key Features

- Chat completion and multi-turn conversation API
- Streaming response with token-by-token output
- Function calling and tool use support
- System prompts and role-based messaging
- JSON mode and structured output

### Quick Start

Integrate Anthropic: Claude Fable 5.1 (Batch) into your application with a single API call. Get your API key from the [pricing page](https://modelslab.com/pricing) to get started.

PythonJavaScriptcURLPHP

```
<code>import requests
import json

url = "https://modelslab.com/api/v7/llm/chat/completions"

headers = {
    "Content-Type": "application/json"
}

data = {
        "model_id": "anthropic-claude-fable-5.1-batch",
        "messages": [
            {
                "role": "user",
                "content": "Hello!"
            }
        ],
        "max_tokens": 1000,
        "key": "YOUR_API_KEY"
    }

try:
    response = requests.post(url, headers=headers, json=data)
    response.raise_for_status()  # Raises an HTTPError for bad responses (4XX or 5XX)
    result = response.json()
    print("API Response:")
    print(json.dumps(result, indent=2))
except requests.exceptions.HTTPError as http_err:
    print(f"HTTP error occurred: {http_err} - {response.text}")
except Exception as err:
    print(f"Other error occurred: {err}")</code>
```

### Pricing

Anthropic: Claude Fable 5.1 (Batch) API costs $15 per million tokens. Pay only for what you use with no minimum commitments. [View pricing plans](https://modelslab.com/pricing)

### Use Cases

- AI chatbots and virtual assistants
- Code generation and developer tools
- Content writing and copywriting automation
- Data analysis, summarization, and extraction

[Browse LLM Models](https://modelslab.com/models?feature=llmaster) [More from Anthropic](https://modelslab.com/models/open_router) [View Pricing](https://modelslab.com/pricing)

Anthropic: Claude Fable 5.1 (Batch) FAQ
---

### What is Anthropic: Claude Fable 5.1 (Batch)?

Claude Fable 5.1 improves on Claude Fable 5 across the board, with the biggest gains in agentic coding, long-running agentic workflows, and knowledge work: long code refactors, front-end and visual...

### How do I use the Anthropic: Claude Fable 5.1 (Batch) API?

You can integrate Anthropic: Claude Fable 5.1 (Batch) into your application with a single API call. Sign up on ModelsLab to get your API key, then use the model ID "anthropic-claude-fable-5.1-batch" in your API requests. We provide SDKs for Python, JavaScript, and cURL examples in the API documentation.

### How much does Anthropic: Claude Fable 5.1 (Batch) cost?

Anthropic: Claude Fable 5.1 (Batch) costs $15 per million tokens. ModelsLab plans start at $21/month (Basic), and the $149/month Open Source plan includes unlimited generation on open-source models.

### What is the Anthropic: Claude Fable 5.1 (Batch) model ID?

The model ID for Anthropic: Claude Fable 5.1 (Batch) is "anthropic-claude-fable-5.1-batch". Use this ID in your API requests to specify this model.

### Do I need a paid plan to use Anthropic: Claude Fable 5.1 (Batch)?

Yes. ModelsLab is subscription-based with no free tier — plans start at $21/month (Basic, 3,250 API calls). The $149/month Open Source Unlimited plan includes unlimited generation across open-source models; premium third-party models are billed per call from your wallet.

---

*This markdown version is optimized for AI agents and LLMs.*

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- [Website](https://modelslab.com)
- [API Documentation](https://docs.modelslab.com)
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---
*Generated by ModelsLab - 2026-09-02*