Kilo Code

Kilo Code is a VS Code extension with a native "Anthropic Messages" custom-provider mode, so no OpenAI-shaped translation is involved.

Setup

Settings (gear icon) → Providers → Custom provider.
Provider API = Anthropic Messages.
Base URL = https://api.inert.lol/v1.
API key = your Inert key.
Type the model IDs manually: fable-5 and opus-5.

Warning

Include the /v1. Kilo appends only /messages to whatever you enter, so the bare host 404s.

Note

Model auto-detect is disabled for Anthropic-type custom providers. Kilo never calls GET /v1/models in this mode, so typed IDs are the only path.

OpenAI Compatible mode

Provider API = OpenAI Compatible with the same https://api.inert.lol/v1 base also works, and that mode does auto-fetch the model list from GET /v1/models.

Notes

This config persists to kilo.jsonc. It's unrelated to "Kilo Gateway", Kilo's own hosted proxy, which is a different product from the custom provider mode above.

A "resource not found" error means the Base URL is missing /v1, or carries an extra path segment.

Next steps

PiAnother agent harness with a provider override.