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.

How much does Hermes 4 405B cost per million tokens?

Hermes 4 405B costs $0.09 in / $0.37 out per 1M tokens.

Is there a discount for cached tokens on Hermes 4 405B?

No cached-input rate is configured for Hermes 4 405B, so every input token bills at the standard rate.

What does a typical chatbot cost on Hermes 4 405B?

A chatbot sending 300,000 requests per month (1,500 input and 400 output tokens each, 50% cached) costs about $84.90 per month on Hermes 4 405B.

What is the context window of Hermes 4 405B?

Hermes 4 405B supports 131.1K tokens of context and up to 8.2K output tokens.

What is a cheaper alternative to Hermes 4 405B?

StepFun Flash is cheaper at $0.11 in / $0.32 out per 1M tokens.

Hermes 4 405B API Pricing (2026): $0.09 in / $0.37 out per 1M tokens

Hermes 4 405B pricing: $0.09 in / $0.37 out per 1M tokens. Tier-aware calculator, cheaper alternatives and Artificial Analysis benchmarks.