Copilot CLI has higher context window than GitHub Copilot extension

[zhzy0077]

Question

Problem

opencode appears to use static GitHub Copilot model limits that are lower than the live Copilot CLI /models response.

Examples from the same account:

• claude-opus-4.6: live CLI 200000, opencode/models.dev 128000
• claude-sonnet-4.6: live CLI 200000, opencode/models.dev 128000
• claude-haiku-4.5: live CLI 144000, opencode/models.dev 128000

This looks like opencode is using static catalog metadata instead of live Copilot model metadata.

Plugins

I forked https://github.com/zhzy0077/opencode-copilot-auth and simply add below and re login to use.

{
  "plugin": [
    "@zhzy0077/opencode-copilot-cli-auth@0.0.15"
  ]
}

[github-actions]

This issue might be a duplicate of existing issues. Please check:

• What is the specific context size of Github Copilot, is it only 128K? #16129: Same question about GitHub Copilot's context size being limited to 128K
• Is there a way to increase Context limit for Github Copilot Provider? #5993: Same report of context limit being lower than what the live Copilot provider actually supports
• [FEATURE]: dynamic model list for copilot plugin #13470: Feature request specifically about using the live Copilot /models endpoint instead of static catalog metadata
• Refreshing the model database doesn't load the latest models from GitHub Copilot #15605: Same root cause — static model catalog not reflecting live Copilot model data

If your issue is distinct from the above, please add clarifying details about how it differs.

[Zakariaaben]

why are you requesting access to so much things as repo and org read access, gists read write access etc ? @zhzy0077

[ayqazi]

This is a serious issue for copilot actually, as compaction occurs when it doesn't really need to, wasting valuable premium requests.

[SadE54]

Latest 1.3 seems to have changed the behavior a little . Now it seems Opencode can see ~142000 tokens , instead of 200000 😅

[krasen1234]

Yup, why isnt this being fixed?

[jcubic]

It seems this is a limitation of GitHub Copilot. To fix this, you need to contact GitHub.

[mdarocha]

I got copilot to quickly whip up a plug-in that I believe fixes this issue:

https://github.com/mdarocha/dotfiles/blob/main/config/llm-agents/opencode/plugins/copilot-fix-models.js

At first glance the values seem correct with this plugin. It also adds model multipliers to the model name in the picker.

The only issue is that it breaks device code flow auth for copilot (since it overwrites the building copilot plugin) - I've fixed that by patching the opencode source.

[jensenojs]

Is this issue still present?

[SadE54]

Is this issue still present?

It seems to be fixed in the last version (1.3.17)