fix: [missing-model] cloudflare-ai-gateway: anthropic/claude-fable-5.1

[github-actions]

Summary

Adds the missing Cloudflare AI Gateway entry for anthropic/claude-fable-5.1 and curates its reasoning controls so the next catalog sync keeps them. The lab model already reasons (models/anthropic/claude-fable-5-1.toml); the gateway had no provider file and no reasoning_options in curation.toml, which is what the sync diagnostic reported.

Changes

• Added providers/cloudflare-ai-gateway/models/anthropic/claude-fable-5.1.toml
  • base_model = "anthropic/claude-fable-5-1"
  • structured_output = true (same as sibling Anthropic models on this host)
  • reasoning_options: effort low | medium | high | xhigh | max
  • cost: input 10, output 50, cache_read 0.25, cache_write 12.5 (USD / MTok)
  • limit.context = 1_000_000
  • provider.npm = "@ai-sdk/anthropic"
• Updated providers/cloudflare-ai-gateway/curation.toml with the same effort set, structured_output, wire-path/note sources so regeneration retains the fix

Evidence

Claim	Source	What it establishes
Model ID / lab base	Models overview; existing models/anthropic/claude-fable-5-1.toml	Claude API ID claude-fable-5-1; catalog id anthropic/claude-fable-5.1 resolves to lab anthropic/claude-fable-5-1 (dot→dash, same as other CF Anthropic ids)
Adaptive thinking always on; effort is the control	Effort; Fable 5.1 overview	Supported levels include low/medium/high/xhigh/max; wire path output_config.effort; no on/off toggle for Fable 5.1
Pricing	Anthropic pricing	$10 / $50 input/output; cache write $12.50 (5m); cache read $0.25 (0.025× base on Fable 5.1)
Host pattern	First-party providers/anthropic/models/claude-fable-5-1.toml; CF peers claude-fable-5, claude-opus-4.8, claude-opus-5; relays OpenRouter/Vercel/Kilo	Same effort set and Anthropic npm on this gateway

Validation

• Cross-checked lab metadata, first-party Anthropic provider entry, Cloudflare AI Gateway Anthropic peers, and Anthropic docs (effort + pricing).
• Did not run bun validate or live Cloudflare catalog/API calls in this environment.

Review notes

• Costs match Anthropic list rates and peer hosts; a later Cloudflare catalog sync may replace cost/limit.context from live pricing if the feed differs.
• No toggle: Fable 5.1 adaptive thinking is always on; control is effort-only (unlike CF claude-sonnet-5, which documents a thinking toggle).
• No budget_tokens: extended thinking budgets are not the Fable 5.1 control surface.

Closes #6216

Automated by the issue fixer: https://github.com/anomalyco/models.dev/actions/runs/33784388041