docs: clarify frontier model families

[keloide]

Summary

Clarifies that the Frontier floor explicitly includes Claude Opus 5+ and GPT-5.6-family models. The policy remains the same: both are already above the stated version floors.

Files changed

• docs/AI-CONTRIBUTOR.md

Track

Developer

LLM

Model: GPT-5 (via Codex; canonical id not exposed)
Tier: Frontier
Thinking: high

Implementation method (required)

Method: not-applicable — documentation-only contributor-policy clarification.

CR references

None.

Verification

• Required checks ran clean, or the exact CI-owned alternative is stated below.

• Gate A output below is for the current committed head.

• Final review-impl below is clean for the current committed head.

• Both anchors cite existing analogous code at the same seam.

• git diff --check upstream/main...HEAD — passed.

• Independent /review-impl documentation review — no findings.

• Markdown-only scope — Cargo and Tilt checks are not applicable.

Gate A

Gate G PASS (router/grant architecture: strict router vs permissive grant boundary intact)
Gate A PASS head=f7781ecbe18536c8fed5e8577f5b415ff7cfbf11 base=98660dbd682407990048bea4ef4d68a0fee292de

Anchored on

• docs/AI-CONTRIBUTOR.md:43 — existing hedged declaration format for a GPT-5.6 variant when a harness does not expose a canonical identifier.
• docs/AI-CONTRIBUTOR.md:369 — existing contributor-prompt guidance that keeps GPT-5.6 variant examples aligned with the tier policy.

Final review-impl

Final review-impl PASS head=f7781ecbe18536c8fed5e8577f5b415ff7cfbf11

Claimed parse impact

None.

Scope Expansion

None.

Validation Failures

None.

CI Failures

None.

Summary by CodeRabbit

• Documentation
  • Updated Frontier model guidance to include Anthropic’s claude-opus-5+ and OpenAI’s gpt-5.6 family.
  • Clarified handling for model variants, separators, and vendor suffixes such as gpt-5.6-sol.
  • Expanded the self-contained contributor prompt with the latest qualification requirements.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro Plus

Run ID: 93188a86-661b-4bae-961f-6cdd23cb028b

📥 Commits

Reviewing files that changed from the base of the PR and between 98660db and f7781ec.

📒 Files selected for processing (1)

• docs/AI-CONTRIBUTOR.md

---

📝 Walkthrough

Walkthrough

The Frontier model documentation now includes Claude Opus 5+, GPT-5.6, and GPT-5.6 variants. It also clarifies version separator normalization and vendor suffix handling in both the model table and the self-contained prompt.

Changes

Frontier model policy

Layer / File(s)	Summary
Frontier model requirements docs/AI-CONTRIBUTOR.md	The Frontier model table and self-contained prompt now include Claude Opus 5+, GPT-5.6, and variants such as gpt-5.6-sol. They also define separator normalization and vendor suffix handling.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Possibly related PRs

• phase-rs/phase#6579: Updates the same Frontier-tier model requirements and qualification rules.
• phase-rs/phase#6584: Updates Frontier model versions and variant qualification rules.
• phase-rs/phase#7207: Updates Frontier model identification and version normalization rules.

Suggested reviewers: matthewevans

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the documentation change to clarify Frontier model families.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands.}

[matthewevans]

This PR changes docs/AI-CONTRIBUTOR.md, a protected instruction document. The repository hard-stop path blocks maintainer handling of an external-contributor PR that modifies this file.

Please remove docs/AI-CONTRIBUTOR.md from this PR. Route any policy changes directly to the maintainers for separate review.