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Project	Deployment	Actions	Updated (UTC)
docs	Skipped		Jun 9, 2026 5:24pm

PR Summary

Medium Risk
Changes Anthropic request shaping for a new flagship model; incorrect thinking routing would break calls or drop effort levels, but the diff is small and mirrors existing Opus 4.8 behavior.

Overview
Adds claude-fable-5 to the Anthropic model catalog with pricing ($10/$1 cached/$50 per M), 1M context, 128k max output, and adaptive-thinking effort levels low through max (default high). The entry intentionally omits nativeStructuredOutputs and temperature, aligned with Fable’s always-on adaptive thinking.

Updates supportsAdaptiveThinking() in anthropic/core.ts so fable-5 uses thinking.type: "adaptive" plus output_config.effort instead of extended budget_tokens thinking—avoiding API rejection and ensuring xhigh/max effort levels actually apply.

^{Reviewed by Cursor Bugbot for commit 3bfe234. Configure here.}

Greptile Summary

This PR registers claude-fable-5 as a new Anthropic model and wires it into the adaptive-thinking routing path in core.ts. The changes are additive and narrowly scoped, touching only the model registry and one routing predicate.

• models.ts: Adds the claude-fable-5 entry at the top of the Anthropic model list with $10/$1/$50 per-million-token pricing, a 1 M-token context window, 128 k max output, and the five-level thinking ladder (low → max, default high). temperature and nativeStructuredOutputs are deliberately absent, matching the Opus 4.8/4.7 pattern for adaptive-only models.
• core.ts: Adds normalizedModel.includes('fable-5') to supportsAdaptiveThinking() so Fable 5 is routed to { type: 'adaptive' } + output_config.effort rather than the budget_tokens path, and updates both the function's docblock and the buildThinkingConfig docblock to list Fable 5 alongside Opus 4.8/4.7.

Confidence Score: 5/5

Safe to merge — the change is additive, touches only the model registry and one routing predicate, and the adaptive-thinking path for Fable 5 is identical to the established Opus 4.8/4.7 path.

The new model entry is consistent with all existing adaptive-only entries, the substring match in supportsAdaptiveThinking follows the same convention used for every other model, and the deliberate omission of temperature and nativeStructuredOutputs is documented and correct. No existing routing logic is altered.

No files require special attention.

Important Files Changed

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[Request with model: claude-fable-5] --> B{thinkingLevel set\nand ≠ 'none'?}
    B -- No --> C[Send payload without\nthinking config\nFable 5 defaults to adaptive]
    B -- Yes --> D[buildThinkingConfig]
    D --> E{supportsAdaptiveThinking?\nfable-5 ✓}
    E -- true --> F["thinking: { type: 'adaptive' }\noutput_config: { effort: level }"]
    E -- false --> G["thinking: { type: 'enabled', budget_tokens: N }"]
    F --> H[Anthropic API]
    G --> H
    C --> H

_{Reviews (2): Last reviewed commit: "docs(anthropic): note Fable 5 in buildTh..." | Re-trigger Greptile}

@greptile

@cursor review