---
title: Body Builder (beta) API | Text Generation | ModelsLab
description: Beta LLM with 128K context window for powerful text generation; ideal for developers via OpenAI-compatible API on OpenRouter, released Dec 2025.[4]
url: https://modelslab.com/models/openrouter/openrouter-bodybuilder.md
canonical: https://modelslab.com/models/openrouter/openrouter-bodybuilder.md
type: product
component: Playground/LLM/Index
generated_at: 2026-06-02T18:01:16.103509Z
---

Body Builder (beta)
---

 [LLMs.txt](https://modelslab.com/models/open_router/openrouter-bodybuilder/llms.txt) [.md](https://modelslab.com/models/openrouter/openrouter-bodybuilder.md)

Body Builder (beta)
---

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

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### Body Builder (beta)

openrouter openrouter-bodybuilder

Copy model ID

PricingInput $0.00 / 1M tokens

Output $0.00 / 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 Tokens1000

Top P0.9

Frequency Penalty0

Presence Penalty0

Model Info

Support

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---

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About Body Builder (Beta)
---

Transform your natural language requests into structured OpenRouter API request objects. Describe what you want to accomplish with AI models, and Body Builder will construct the appropriate API calls. Example: "count to 10 using gemini and opus." This is useful for creating multi-model requests, custom model routers, or programmatic generation of API calls from human descriptions. BETA NOTICE: Body Builder is in beta, and currently free. Pricing and functionality may change in the future.

### Technical Specifications

Model IDopenrouter-bodybuilder

CategoryLLM Models

TaskText Generation

AddedFebruary 20, 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 Body Builder (Beta) 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": "openrouter-bodybuilder",
        "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>
```

### 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 Openrouter](https://modelslab.com/models/open_router) [View Pricing](https://modelslab.com/pricing)

Body Builder (Beta) FAQ
---

### What is Body Builder (Beta)?

Transform your natural language requests into structured OpenRouter API request objects. Describe what you want to accomplish with AI models, and Body Builder will construct the appropriate API calls. Example: "count to 10 using gemini and opus." This is useful for creating multi-model requests, cu

### How do I use the Body Builder (Beta) API?

You can integrate Body Builder (Beta) into your application with a single API call. Sign up on ModelsLab to get your API key, then use the model ID "openrouter-bodybuilder" in your API requests. We provide SDKs for Python, JavaScript, and cURL examples in the API documentation.

### What is the Body Builder (Beta) model ID?

The model ID for Body Builder (Beta) is "openrouter-bodybuilder". Use this ID in your API requests to specify this model.

### Does Body Builder (Beta) have a free tier?

Yes, ModelsLab offers a free tier that lets you try Body Builder (Beta) and other AI models. Sign up to get free API credits and start building immediately.

---

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

**Links:**
- [Website](https://modelslab.com)
- [API Documentation](https://docs.modelslab.com)
- [Blog](https://modelslab.com/blog)

---
*Generated by ModelsLab - 2026-06-02*