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)":