Easily Create API Calls with Body Builder

Transform your descriptions into structured API requests effortlessly.

Input: text Output: text Context: 128,000 tokens Release: 2025-12-05

Body Builder, created by OpenRouter and released on December 5, 2025, is designed to convert your natural language requests into structured API request objects. With a context length of 128,000, this model efficiently handles text-to-text interactions, allowing you to describe your goals in plain language. For instance, you can instruct it to 'count to 10 using gemini and opus,' and Body Builder will generate the appropriate API calls. This capability is particularly useful for crafting multi-model requests and automating API call generation, making your interactions with AI models seamless and intuitive.

Use Cases

Here are a few ways teams apply Body Builder (beta) in practice—from fast drafting to multimodal understanding. Adapt these ideas to your workflow.

Simplify API call creation for developers

Automate interactions with multiple AI models

Enhance productivity in programming tasks

Facilitate custom model routing effortlessly

Key Features

A quick look at the capabilities that make this model useful in real projects.

Converts natural language to API requests

Supports text-to-text interactions

Handles complex multi-model requests

Generates API calls from simple instructions

Large context length of 128,000 tokens

Specs

Overview

Vendor
openrouter

Model ID
openrouter/bodybuilder

Release
2025-12-05

Modalities & context

Input
text

Output
text

Context
128,000 tokens

Parameters & defaults

Supported parameters: —

Defaults: temperature 0.2, top_p 0.95

Benchmark tests: Body Builder (beta)

We ran this model against a few representative prompts to show its range. Review the outputs below and be the judge.

Text

Prompt:

Write 150 words on how AI might positively upend work, leisure and creativity

{ "requests": [ { "model": "openrouter/auto", "messages": [ { "role": "user", "content": "Write 150 words on how AI might positively upend work, leisure and creativity" } ] } ] }

Run this prompt on Upend.AI

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up.end

/ˌəpˈend/

verb

To “upend” means to completely disrupt, overturn, or drastically change the established order or structure of something. It implies a significant shift or alteration that can potentially have far-reaching consequences. When something is upended, it is turned upside down or transformed in a way that challenges conventional norms or expectations. The term often carries a sense of innovation, transformation, and sometimes even a hint of upheaval, indicating that the changes are not just minor adjustments but rather a fundamental reimagining of the status quo.

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