Add Fable 5.1 and Gemini 3.8 release dates

[DanielButler1]

Summary

• set Claude Fable 5.1 release date to September 1, 2026
• set the tracked Gemini 3.8 Flash release date to September 2, 2026

Validation

• pnpm validate:data
• pnpm validate:pricing
• pnpm validate:gateway
• git diff --check

Summary by CodeRabbit

• Data Updates
  • Added release dates for Claude Fable 5.1 and Gemini 3.8 Flash.
• Chores
  • Prepared a patch release containing the updated model metadata.

[vercel]

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Project	Deployment	Actions	Updated
phaseo	Ready	Preview	Sep 1, 2026 10:37pm UTC

[github-actions]

Dependency Review

✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.

Scanned Files

None

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Team

Run ID: 1e117d75-1c66-4d45-a1b2-d4014fa1c198

📥 Commits

Reviewing files that changed from the base of the PR and between a9d9e1c and 01dfc55.

📒 Files selected for processing (3)

• .changeset/date-fable51-gemini38.md
• packages/data/catalog/src/data/models/anthropic/claude-fable-5.1/model.json
• packages/data/catalog/src/data/models/google/gemini-3.8-flash/model.json

---

📝 Walkthrough

Walkthrough

The catalog now records release dates for Claude Fable 5.1 and Gemini 3.8 Flash. A patch changeset documents both metadata updates.

Changes

Model release dates

Layer / File(s)	Summary
Model metadata and package release tracking packages/data/catalog/src/data/models/anthropic/claude-fable-5.1/model.json, packages/data/catalog/src/data/models/google/gemini-3.8-flash/model.json, .changeset/date-fable51-gemini38.md	The model metadata now uses release timestamps of 2026-09-01T00:00:00 and 2026-09-02T00:00:00. A patch changeset documents the updates.

Estimated code review effort: 1 (Trivial) | ~2 minutes

✨ Finishing Touches 💡 1

🛠️ Fix failing CI checks 💡

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/release-dates-fable51-gemini38-20260901

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[chatgpt-codex-connector]

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Reviewed commit: 01dfc5513b

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[chatgpt-codex-connector]

Keep the unconfirmed Gemini release date unset

This assigns a concrete release date to a hidden, rumoured placeholder even though the same record states that Google has not confirmed its release date, has no sources, and remains unverified. Catalog consumers can therefore treat September 2 as an actual release date despite there being no provenance for it; leave this null until the date is verified, or update the source and verification metadata with authoritative evidence.

AGENTS.md reference: packages/data/catalog/AGENTS.md:L10-L10

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