AnthropicClaude Fable 5VSOpenAIGPT-5.4 nano
Our Take
We recommend Claude Fable 5 if you need peak intelligence for reasoning and coding tasks, or the 43.2x cheaper GPT-5.4 nano to optimize your budget for high-volume pipelines. While Claude Fable 5 holds a clear performance lead, it carries a heavy price premium. Choose Claude Fable 5 for complex logic, or GPT-5.4 nano for budget efficiency.
▶WHY?
Benchmark Calculations & Evidence:
Coding Benchmarks: Both models were evaluated on the SWE-bench Pro benchmark. Claude Fable 5 scored 80.3%, while GPT-5.4 nano scored 52.4%.
Reasoning Benchmarks: Both models were evaluated on the GPQA Diamond benchmark. Claude Fable 5 scored 94.1%, while GPT-5.4 nano scored 82.8%.
Cost Efficiency: GPT-5.4 nano pricing ($0.2/M input, $1.25/M output) is 43.2x cheaper than Claude Fable 5 ($10/M input, $50/M output).
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Benchmarks & Scores
Coding (swe-bench-pro)Winner (+27.9%)
80.3%complex codebases, multi-file repositories, and architectural planning
Reasoning (gpqa-diamond)Winner (+11.3%)
94.1%graduate-level science QA
Cost & Context
Cost (per 1M tokens)
$20.00Input: $10.00 | Output: $50.00Context WindowLarger
1.05M tokensBenchmarks & Scores
Coding (swe-bench-pro)
52.4%complex codebases, multi-file repositories, and architectural planning
Reasoning (gpqa-diamond)
82.8%graduate-level science QA
Cost & Context
Cost (per 1M tokens)43.2x cheaper
$0.46Input: $0.20 | Output: $1.25Context Window
400k tokensFrequently Asked Questions about Claude Fable 5 vs GPT-5.4 nano
GPT-5.4 nano is cheaper than Claude Fable 5. GPT-5.4 nano has a blended cost of $0.46/1M tokens, which is about 43.2x cheaper than Claude Fable 5 at $20.00/1M tokens.
Claude Fable 5 is better for coding tasks on this benchmark. It scores 80.3% on swe-bench-pro (complex codebases, multi-file repositories, and architectural planning) compared to GPT-5.4 nano which scores 52.4%.
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