OpenPaths is an open source model router and AI gateway. One API key and one base URL (https://openpaths.io/v1) reach language, image, video, speech, music, embedding and 3D models from many providers.

Is OpenPaths compatible with the OpenAI and Anthropic SDKs?

Yes. POST /v1/chat/completions follows the OpenAI schema and POST /v1/messages follows the Anthropic schema. Change the base URL and keep your existing code.

How does OpenPaths pricing work?

Pay as you go at the provider price with near-zero markup. Requests on your own provider keys (BYOK) are recorded at $0. See https://openpaths.io/pricing.

What does openpaths/auto do?

openpaths/auto routes each request to a suitable model automatically, with automatic fallbacks when a provider fails or rate-limits.

Is there an OpenAPI spec or MCP server?

Yes. The OpenAPI 3.1 spec is at https://openpaths.io/openapi.json, the MCP endpoint is https://openpaths.io/mcp, and llms.txt plus llms-full.txt list every model id.

What is the model ID for NVIDIA: Nemotron 3.5 Lightning (free) on OpenPaths?

Use or/nemotron-3.5-lightning:free as the model field in the OpenPaths API.

How much does NVIDIA: Nemotron 3.5 Lightning (free) cost?

Input price 0 USD (per 1M tokens), with near-zero OpenPaths markup.

NVIDIA: Nemotron 3.5 Lightning (free) API, Pricing, Context Window

NVIDIA: Nemotron 3.5 Lightning (free) from OpenRouter: NVIDIA Nemotron 3.5 Lightning is an open mixture-of-experts model from NVIDIA, with 3B active…