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

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Assessment

Difficulty
2/5
Estimated time
1-3 hours
Newbie friendliness
68/100
Issue type
Feature
Clarity
Clearly specified
Activity status
Quiet
Tech stack
typescript
Domain
ai

Research direction

Start by locating the models.dev registry entry for the github-copilot provider and reviewing the existing claude-opus-4.6 definition with context: 144000. Add the separate 1M-context model entry so it appears in the GitHub Copilot model picker, matching the option exposed by VS Code.

Written by the indexing model from the issue text.

Description

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:
Image

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

Dominant language
TypeScript
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Avg merge
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Merged PRs (30d)
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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

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