Copilot CLI has higher context window than GitHub Copilot extension

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/[email protected]"
  ]
}

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.

@zhzy0077

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

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

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

Yup, why isnt this being fixed?

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

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.

Is this issue still present?

Is this issue still present?

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

Is this issue still present?

144k context in 1.4.0

yes it's officially fixed. so no plugin is needed.

No, this most definitely isn't fixed:

Context
106,508 tokens
74% used

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Copilot CLI has higher context window than GitHub Copilot extension #16861

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Copilot CLI has higher context window than GitHub Copilot extension #16861

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github-actions commented on Mar 10, 2026

Zakariaaben commented on Mar 16, 2026

ayqazi commented on Mar 18, 2026

SadE54 commented on Mar 23, 2026

krasen1234 commented on Mar 27, 2026

jcubic commented on Mar 27, 2026

mdarocha commented on Mar 27, 2026

jensenojs commented on Apr 7, 2026

SadE54 commented on Apr 7, 2026

pnacovsky commented on Apr 8, 2026

zhzy0077 commented on Apr 8, 2026

aysbg commented on Apr 23, 2026

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