[changelog] [Added] Forge LLMs (Preview) now supports Claude Opus 4.8
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Assessment
- Difficulty
- 2/5
- Estimated time
- 1-3 hours
- Newbie friendliness
- 74/100
- Issue type
- Feature
- Clarity
- Mostly clear
- Activity status
- Quiet
- Tech stack
- typescript
- Domain
- ai-infra-agents
Research direction
Start with src/llm.ts and inspect the model map and status list. Compare them with the linked Forge supported-models documentation, confirm the model IDs for Claude Opus 4.7, Claude Sonnet 5, and Claude Opus 4.8, and reconcile the full batch. Done means the shim accepts every newly supported model without adding a behavior-change footer.
Written by the indexing model from the issue text.
Description
guid: CHANGE-3356
pubDate: Mon, 20 Jul 2026 05:49:25 GMT
category: Added (Preview)
link: https://developer.atlassian.com/platform/forge/changelog/#CHANGE-3356
What's changing
Support for the Claude Opus 4.8 model is now available in Forge LLMs (Preview). See the supported models list.
Parity impact for forge-sim
This touches the @forge/llm shim. forge-sim maintains an explicit supported-models allowlist in src/llm.ts (the model map + status list, currently topping out at claude-opus-4-6). If the shim rejects a model name that real Forge now accepts, that's a parity gap (throwing where Forge succeeds).
The map is already behind on recent bumps — it lacks claude-opus-4-7 (CHANGE-3334), claude-sonnet-5 (CHANGE-3352, tracked in #9), and now claude-opus-4-8. Worth reconciling the whole batch against the live supported-models doc in one pass, and confirming the model-id string Atlassian uses (claude-opus-4-8 vs a dated variant).
Additive change (new model row), so no forge-spec behavior-change footer needed.
- Dominant language
- TypeScript
- Stars
- 5
- Forks
- 2
- PR merge metrics
- No merged PRs in 30d
Contributor guide
No contributing guide indexed for this repository
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
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