Grawlix

Route GitHub Copilot Chat through the Grawlix proxy with a single organization-issued API key — Anthropic, OpenAI, and Gemini models, all behind one key.

The extension registers Grawlix as a Copilot language-model provider, so you pick a (Grawlix) model in the Copilot Chat model picker and requests route through your organization's proxy. You authenticate with one Grawlix API key; the underlying Anthropic / OpenAI / Gemini keys stay in the proxy and never reach your machine.

Setup

Install the extension.
Run Grawlix: Manage from the Command Palette (Ctrl/Cmd + Shift + P) and enter your organization-issued Grawlix API key. It's stored in VS Code's OS-backed Secret Storage.
Open Copilot Chat and choose a (Grawlix) model from the model picker.

Copilot Ask and Edit work with Grawlix models. Inline code completions (grey ghost text) are unaffected and continue to run on GitHub's infrastructure.

Models

Every model supports tool calling and image input.

Model	Provider	Context window	Max output
Claude Fable 5	Anthropic	1M	128K
Claude Opus 5	Anthropic	1M	128K
Claude Opus 4.8	Anthropic	1M	128K
Claude Sonnet 5	Anthropic	1M	128K
Claude Sonnet 4.6	Anthropic	1M	128K
GPT-5.6 Sol	OpenAI	1.05M	128K
GPT-5.6 Terra	OpenAI	1.05M	128K
GPT-5.6 Luna	OpenAI	1.05M	128K
GPT-5.5 Pro	OpenAI	1.05M	128K
GPT-5.5	OpenAI	1.05M	128K
GPT-5.4	OpenAI	1.05M	128K
GPT-5.4 mini	OpenAI	400K	128K
GPT-5.3 Codex	OpenAI	400K	128K
Gemini 3.1 Pro (Preview)	Gemini	1M	64K
Gemini 3.6 Flash	Gemini	1M	64K
Gemini 3.5 Flash	Gemini	1M	64K
Gemini 3.5 Flash-Lite	Gemini	1M	64K

GPT-5.5 Pro does not stream: its answer appears all at once when the request completes, rather than token by token. It also ignores the low setting of grawlix.reasoningEffort, treating it as medium (the lowest rung it accepts).

Models appear in the picker with a (Grawlix) suffix. The exact list available to you depends on your organization's proxy configuration.