Is Claude Fable 5 good at Coding?
Claude Fable 5 ranks #5 of 58 for Coding — excellent. The top pick for this task is claude-sonnet-5-high.
Claude Fable 5 on each Coding sub-task
| Bug Fixing | 100.0/100 | #2 |
| Code Review & Security | 100.0/100 | #2 |
| Secure Implementation | 98.0/100 | #35 |
| Code Quality and Testing Test | 94.2/100 | #1 |
| Code Review and Risk Test | 86.0/100 | #2 |
| API and Data Code Test | 78.0/100 | #11 |
| Refactoring | 78.0/100 | #44 |
Real examples, graded
WinFix off-by-one Python bug 100/100
“The model provides a perfect, minimal fix that addresses the root cause of the off-by-one errors. It correctly leverages Python's slicing mechanics to satisfy the 1-indexed inclusive contract without changing the public API. The explanation is concise and accurate, and the provided tests validate the expected edge cases.”
WinJavaScript debounce implementation 100/100
“The model provides a flawless, production-ready implementation of debounce with cancel and flush support. It correctly handles edge cases like preserving the latest arguments and 'this' context, and avoids memory leaks by nullifying references after execution.”
WinStale React state update 100/100
“The model perfectly diagnoses the root cause (state snapshot/stale closure and batching) and provides the exact minimal fix required (functional updater). The explanation is exceptionally clear and accurate.”
WeakJavaScript debounce implementation 94/100
“The model correctly implements the requested debounce function with cancel support, properly handling closures for `this` and arguments. However, it introduces slight scope creep by adding an unrequested `flush` method. Furthermore, the `flush` method is subtly incorrect as it fails to use the arguments from the pending call, instead relying on arguments passed directly to `flush`. Since `flush` was not requested, this is only a minor deduction.”
WeakFailing test diagnosis 26/100
“The constructed example is mathematically incorrect and the explanation of float arithmetic is completely wrong.”
WeakRace condition in a job worker (Northwind) 98/100
“The model perfectly identifies the high-severity concurrency issue and provides a robust, multi-layered fix including atomic database updates, idempotency keys, and a reaper for stuck jobs. The only minor flaw is implying MySQL supports `UPDATE ... RETURNING`, but the overall logic, explanation, and fallback are excellent.”
Frequently asked
Is Claude Fable 5 good at Coding?
Claude Fable 5 ranks #5 of 58 models we tested for Coding, scoring excellent.
What is Claude Fable 5's strongest Coding skill?
Its best sub-task here is Bug Fixing.
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Prompt × model results
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