GitHub Copilot provider missing Claude Opus 4.6 (1M context) model

[anson627]

OpenCode's GitHub Copilot model picker does not include "Claude Opus 4.6 (1M context)" as a selectable option, while VS Code's GitHub Copilot does expose it.

Current behavior

The GitHub Copilot provider in OpenCode lists claude-opus-4.6 with 144K context only. There is no 1M context variant available.

Expected behavior

A separate "Claude Opus 4.6 (1M context)" model should appear in the model picker, matching what GitHub Copilot exposes in VS Code.

Root cause

The models.dev registry only defines a single claude-opus-4.6 entry under the github-copilot provider with context: 144000. The 1M context variant needs to be added as a separate model entry.

Screenshots

OpenCode — no 1M context option:

VS Code GitHub Copilot — shows "Claude Opus 4.6 (1M context)":

[anson627]

this is the root cause for anomalyco/opencode#5993

[cubercsl]

It appears this is still an internally-only model in your subscription and not GA yet. As far as I know, the model ID should be claude-opus-4.6-1m.

[keith-pw]

1M context might be available for the $39 GHCP plan, but for the broke plan it shouldn't be 144k? Atleast in VS Code it shows 200k for both Sonnet and Opus: