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Anthropic

Claude Fable 5

VS
OpenAI

GPT-5.5 Pro

Decision Recommendation

⚖️ Trade-off decision: Choose Claude Fable 5 for deep reasoning tasks, or GPT-5.5 Pro for real-time user experiences since it has higher speed.

Model Specs

Claude Fable 5

Benchmarks & Scores

Coding (swe-bench-pro)Winner (+)
80.3%
Reasoning (gpqa-diamond)
94.1%

Cost & Performance

Cost (per 1M tokens)3.4x cheaper
$20.00Input: $10.00 | Output: $50.00
Speed
60.3 tps
Context Window
1M tokens
Model Specs

GPT-5.5 Pro

Benchmarks & Scores

Coding (swe-bench-pro)
N/A
Reasoning (gpqa-diamond)Winner (+2.1%)
96.2%

Cost & Performance

Cost (per 1M tokens)
$67.50Input: $30.00 | Output: $180.00
Speed1.2x faster
74 tps
Context WindowLarger
1.05M tokens

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