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.

Claude Fable 5.1 vs Muse Spark 1.3

For 10M input + 2M output tokens, Muse Spark 1.3 costs $21.00 versus $200.00 for Claude Fable 5.1 (90% cheaper). Context windows: Claude Fable 5.1 1M, Muse Spark 1.3 1M.

Model	Provider	Context	Price
Claude Fable 5.1 `claude-fable-5-1`	Anthropic	1M	$10.00 in / $50.00 out per 1M tokens
Muse Spark 1.3 `muse-spark-1.3`	Meta	1M	$1.25 in / $4.25 out per 1M tokens

Claude Fable 5.1 Muse Spark 1.3 Chat Completions API