Anthropic Claude Sonnet 5 VS OpenAI GPT-5.5 Pro
Decision Recommendation
⚖️ Editorial Verdict: In our analysis, GPT-5.5 Pro is the premium intelligence choice, scoring 63.2% higher on coding benchmarks. However, this accuracy premium comes with a cost overhead: Claude Sonnet 5 is 16.9x cheaper to run. If you are building high-volume, simple chatbots or processing massive amounts of text where budget is critical, Claude Sonnet 5 offers excellent cost savings. For agentic reasoning, code refactoring, or complex logical tasks, the accuracy premium of GPT-5.5 Pro fully justifies the cost.
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Model Specs
Claude Sonnet 5
Benchmarks & Scores
Coding (swe-bench-pro)
63.2%excellent at multi-file repositories, autonomous agents, and industrial codebases
Reasoning (gpqa-diamond)
N/Agraduate-level science QA
Cost & Performance
Cost (per 1M tokens)16.9x cheaper
$4.00Input: $2.00 | Output: $10.00Context Window
1.05M tokensModel Specs
GPT-5.5 Pro
Benchmarks & Scores
Coding (swe-bench-pro)
N/Aexcellent at multi-file repositories, autonomous agents, and industrial codebases
Reasoning (gpqa-diamond)
96.2%graduate-level science QA
Cost & Performance
Cost (per 1M tokens)
$67.50Input: $30.00 | Output: $180.00Context WindowLarger
1.05M tokensFrequently Asked Questions about Claude Sonnet 5 vs GPT-5.5 Pro comparison
Claude Sonnet 5 is cheaper than GPT-5.5 Pro. Claude Sonnet 5 has a blended cost of $4.00/1M tokens, which is about 16.9x cheaper than GPT-5.5 Pro at $67.50/1M tokens.
Claude Sonnet 5 is better for coding tasks on this benchmark. It scores 63.2% on swe-bench-pro (excellent at multi-file repositories, autonomous agents, and industrial codebases) compared to GPT-5.5 Pro which scores N/A.
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