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Jan runs a local API server at localhost

2026-06-23 · 17:37 UTC ·@hasantoxr ·0 min read

Brief

Jan operates an OpenAI-compatible local API server on localhost:1337; by changing a single base URL in your application or agent setup you can run your existing workflow against local models instead of cloud providers. This requires no code rewriting, removes vendor lock-in, and eliminates per-token cloud billing while preserving current integrations.

Why it matters

Jan runs a local API server at localhost:1337 that implements the OpenAI-compatible API.

Key details

  • Switching one base URL in an app or agent routes the entire workflow to local models (no code rewrite required), avoiding vendor lock-in and per-token cloud billing.
  • The approach preserves existing integrations while replacing cloud model endpoints with a local server, enabling on-premise model usage.
Source evidence

Jan runs a local API server at localhost :1337

It's OpenAI-compatible. Change one base URL in your app or agent setup and your entire workflow runs on local models instead of cloud.

No code rewrite. No vendor lock-in. No per-token bill at the end of the month.