Give Copilot CLI a try if you haven't in a while! The team's been working really hard to improve the harness, and we're taking as much community feedback as we can get! Let me know if you run into any problems :)

https://github.com/github/copilot-cli

I feel your pain. I used to work for a bank and the security team only approved Copilot use.

OpenCode can use Copilot natively: https://opencode.ai/docs/providers/#github-copilot

I got Claude Code running with Copilot APIs via the LiteLLM proxy, but it was a pain in the butt. Just use OpenCode.

If you can use the Copilot CLI, it's highly likely you can use OpenCode with the same API key. It's worth doing a little research.

The CLI tool matters. If you're not using opencode/claude you're missing out. But the latest OpenAI models are really quite good.