OpenRouter

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.

This model was an early testing version of Mistral Large 3. Try the official launch of Mistral Large 3 here This is a cloaked model provided to the community to gather feedback. A general-purpose multimodal model (text/image in, text out) designed for reliability, long-context comprehension, and adaptive logic. It is engineered for production-grade assistants, retrieval-augmented systems, science workloads, and complex agentic workflows. Note: All prompts and completions for this model are logged by the provider and may be used to improve the model.

This model was an early snapshot of Grok 4.1 Fast with reasoning disabled. Try the official launch of Grok 4.1 Fast here This is a cloaked model provided to the community to gather feedback. A frontier non-reasoning model that excels at tool calling, with a 1.8M context window and multimodal support. Note: All prompts and completions for this model are logged by the provider and may be used to improve the model.

This model was an early snapshot of Grok 4.1 Fast with reasoning enabled. Try the official launch of Grok 4.1 Fast here This is a cloaked model provided to the community to gather feedback. A frontier reasoning model that excels at tool calling, with a 1.8M context window and multimodal support. Note: All prompts and completions for this model are logged by the provider and may be used to improve the model.

This model was an early snapshot of GPT-5.1 with reasoning effort set to minimal. Try the official launch of GPT-5.1 here This is a cloaked model provided to the community to gather feedback. A powerful, general-purpose model that excels across real-world tasks, with standout performance in coding, tool calling, and instruction following. Note: All prompts and completions for this model are logged by the provider and may be used to improve the model.

This model has been revealed as NVIDIA Nemotron Nano 2 VL. It continues to be offered for free by NVIDIA here. This is a small reasoning VLM trained for image understanding. It's strengths include multi-image comprehension (6+ images), especially those containing charts and text. This is a cloaked model provided to the community to gather feedback. Note: All prompts and output are logged to improve the provider’s model and its product and services. Please do not upload any personal, confidential, or otherwise sensitive information. This is a trial use only. Do not use for production or business-critical systems.

This is a cloaked model provided to the community to gather feedback. A fast and intelligent general-purpose frontier model with a 2 million token context window. Supports image inputs and parallel tool calling. Note: It’s free to use during this testing period, and prompts and completions are logged by the model creator for feedback and training.

This is a cloaked model provided to the community to gather feedback. A maximally intelligent general-purpose frontier model with a 2 million token context window. Supports image inputs and parallel tool calling. Note: It’s free to use during this testing period, and prompts and completions are logged by the model creator for feedback and training.

This is a cloaked model provided to the community to gather feedback. This is an improved version of Horizon Alpha Note: It’s free to use during this testing period, and prompts and completions are logged by the model creator for feedback and training.

This was a cloaked model provided to the community to gather feedback. It has been deprecated - see Horizon Beta. Note: It’s free to use during this testing period, and prompts and completions are logged by the model creator for feedback and training.

This is a cloaked model provided to the community to gather feedback. It's an all-purpose model supporting real-world, long-context tasks including code generation. Note: All prompts and completions for this model are logged by the provider and may be used to improve the model and other products and services. You remain responsible for any required end user notices and consents and for ensuring that no personal, confidential, or otherwise sensitive information, including data from individuals under the age of 18, is submitted.

This is a cloaked model provided to the community to gather feedback. It's geared toward real world use cases, including programming. Note: All prompts and completions for this model are logged by the provider and may be used to improve the model.

This is a cloaked model provided to the community to gather feedback. It’s a powerful, all-purpose model supporting long-context tasks, including code generation. Note: All prompts and completions for this model are logged by the provider and may be used to improve the model.

This model is under development. Check the OpenRouter Discord for updates.

Your prompt will be processed by a meta-model and routed to one of dozens of models (see below), optimizing for the best possible output. To see which model was used, visit Activity, or read the model attribute of the response. Your response will be priced at the same rate as the routed model. The meta-model is powered by Not Diamond. Learn more in our docs. Requests will be routed to the following models: - openai/gpt-5.1 - openai/gpt-5 - openai/gpt-5-mini - openai/gpt-5-nano - openai/gpt-4.1 - openai/gpt-4.1-mini - openai/gpt-4.1-nano - openai/gpt-4o - openai/gpt-4o-2024-05-13 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -