feat: suspend Claude Fable 5 access on all providers

[smakosh]

Deactivate the claude-fable-5 model on both the Anthropic and AWS
Bedrock provider mappings so requests return a clear 410 and routing
skips it. Migrate the anthropic/bedrock refusal billing tests to an
active model, and add a changelog entry announcing the suspension.

Summary by CodeRabbit

• Chores
  • Claude Fable 5 model access is now suspended effective immediately
  • Direct requests to the deactivated model will receive an HTTP 410 response
  • The system automatically routes around the disabled model and skips it in fallback logic
  • Users should switch to alternative gateway models

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: ee5bfb22-980f-4b09-a2a9-04290f9e6c4c

📥 Commits

Reviewing files that changed from the base of the PR and between 0a70074 and 4a757df.

📒 Files selected for processing (3)

• apps/gateway/src/api.spec.ts
• apps/ui/src/content/changelog/2026-06-13-claude-fable-5-access-suspended.md
• packages/models/src/models/anthropic.ts

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Walkthrough

Claude Fable 5 model access is suspended effective 2026-06-13 across Anthropic and AWS Bedrock. The model is marked as deactivated in the model registry, documented in a user-facing changelog, and tests depending on the model are migrated to claude-opus-4-8 with recalculated billing assertions.

Changes

Claude Fable 5 Model Suspension

Layer / File(s)	Summary
Model deactivation in registry packages/models/src/models/anthropic.ts	Claude Fable 5 entries for both Anthropic and AWS Bedrock providers are marked with deactivatedAt: new Date("2026-06-13").
Changelog and user-facing documentation apps/ui/src/content/changelog/2026-06-13-claude-fable-5-access-suspended.md	New changelog entry documents the suspension: HTTP 410 responses for direct requests, automatic skip in routing/fallback logic, recommended alternatives, and notification of when access will be restored.
Test suite migration to claude-opus-4-8 apps/gateway/src/api.spec.ts	Anthropic and AWS Bedrock refusal-billing tests (non-streaming refusal without output, refusal with partial output, and streaming refusal) are updated from claude-fable-5 to claude-opus-4-8; billing cost expectation for partial-output refusal is recalculated to match the new model's pricing.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~12 minutes

Possibly related PRs

• theopenco/llmgateway#2631: Both PRs modify packages/models/src/models/anthropic.ts's claude-fable-5 configuration—feat(models): add Bedrock Claude Fable 5 #2631 adds the AWS Bedrock provider entry, while the main PR updates the same claude-fable-5 providers to set deactivatedAt for temporary suspension.
• theopenco/llmgateway#2609: Both PRs modify the packages/models/src/models/anthropic.ts anthropicModels mapping for claude-fable-5—fix(models): add 1h cache write price to Claude Fable 5 #2609 adds cacheWriteInputPrice1h, while the main PR deactivates the model via deactivatedAt for Anthropic and AWS Bedrock.
• theopenco/llmgateway#2642: The main PR's apps/gateway/src/api.spec.ts updates (switching Anthropic refusal-billing tests to claude-opus-4-8 and recalculating expected partial-output billing) directly align with refusal billing test suite behavior and expectations.

🚥 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 directly and clearly summarizes the main change: suspending Claude Fable 5 model access across all providers, which is the primary objective documented in the PR description.
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.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch claude/fable-5-access-suspension-in7stx

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