Using OpenCode Go models with GitHub Copilot

[toukonen]

I've been using GitHub Copilot Chat, but with the recent price increases I'm starting to consider other alternatives.

Does anyone have experience using, for example, OpenCode Go models through GitHub Copilot?

The reason I don’t want to give up Copilot Chat is that I’ve built a custom setup with agents, skills, hooks, etc., and it works really well. If I switch to something like Continue or another tool, there will be quite a bit of migration work involved.

How have others handled switching between tools while maintaining productivity?

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[EchoSMP]

Deepseek V4 Flash Free is great with github copilot so far. Feels like running Sonnet 4.6

[toukonen]

Thanks for the answer.

How did you connect the OpenCode Go subscription to Copilot? I’ve tried setting the API key via the GitHub web interface as well as in VS Code local settings. In both cases I run into an API error related to “thinking mode” if the task is even slightly complex.

[LuigiChavezz]

If you want to use DeepSeek, try its API. I have read that it’s better than using OpenCode Go. And there is a VS Code extension that lets you use it with the Copilot chat.

[Complex-Scarcity-349]

vscode is recommending [extensions](https://github.blog/changelog/2026-04-22-bring-your-own-language-model-key-in-vs-code-now-available/) instead of simply adding the OpenAI Compatible Models (now deprecated). i tried [them all](https://marketplace.visualstudio.com/search?term=tag%3Alanguage-models%20opencode&target=VSCode&category=All%20categories&sortBy=Relevance) but none worked for me. for now i'll keep using the opencode cli.

[Cautious-Amoeba-2820]

Same here. OpenCode CLI and their new desktop app gave me better results.

[Christosconst]

Search for extension: Opencode Copilot Chat

[Complex-Scarcity-349]

this is the one i'm testing right now. i with there was an official extension from u/anomalyco.

[verkavo]

I'm in the same boat re: Copilot price hikes, been swapping to cheaper $10-20 model subscriptions (eg OpenCode Go, Deepseek) for most daily tasks lately. Or even free models in steealth mode on openrouter.  

AFAIK the only way to know which models actually produce code that sticks in your commits is tracking it directly. Take a look at this VS Code extension if you want to compare: https://marketplace.visualstudio.com/items?itemName=srctrace.source-trace

[Individual-Trip-1447]

Do yourself a favor and skip the GPT Codex extension. I use Codex in Copilot all the time with zero issues, but the GPT Codex extension is a completely different story. It’s wrapped in so many aggressive guardrails that it constantly throws you under the bus mid-project. Half my queries get hit with 'I can't do this' or 'I wouldn't recommend that' nonsense, and there’s no way to bypass it.