OpenAI GPT-5.5 VS OpenAI GPT-5.6 Sol
Decision Recommendation
👑 Editorial Verdict: GPT-5.6 Sol strictly dominates GPT-5.5 across all compared dimensions. It is not only more cost-effective (blended cost of $11.25 vs $11.25 per 1M tokens) but also delivers superior coding accuracy (64.6% vs 58.6% on SWE-bench). Unless you have platform lock-in, GPT-5.6 Sol is the clear and optimal choice for all development workloads.
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Model Specs
GPT-5.5
Benchmarks & Scores
Coding (swe-bench-pro)
58.6%excellent at multi-file repositories, autonomous agents, and industrial codebases
Reasoning (gpqa-diamond)
93.6%graduate-level science QA
Cost & Performance
Cost (per 1M tokens)
$11.25Input: $5.00 | Output: $30.00Context Window
1.05M tokensModel Specs
GPT-5.6 Sol
Benchmarks & Scores
Coding (swe-bench-pro)Winner (+6.0%)
64.6%excellent at multi-file repositories, autonomous agents, and industrial codebases
Reasoning (gpqa-diamond)Winner (+1.0%)
94.6%graduate-level science QA
Cost & Performance
Cost (per 1M tokens)
$11.25Input: $5.00 | Output: $30.00Context Window
1.05M tokensFrequently Asked Questions about GPT-5.5 vs GPT-5.6 Sol comparison
Both GPT-5.5 and GPT-5.6 Sol cost the same, with a blended cost of $11.25 per 1 million tokens.
GPT-5.6 Sol is better for coding tasks on this benchmark. It scores 64.6% on swe-bench-pro (excellent at multi-file repositories, autonomous agents, and industrial codebases) compared to GPT-5.5 which scores 58.6%.
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