OpenAIGPT-5.5VSOpenAIGPT-5.6 Sol
Our Take
GPT-5.6 Sol is the clear winner here. It beats GPT-5.5 across the board because it offers superior reasoning and coding capabilities at the same cost. Unless you have specific platform restrictions, go with GPT-5.6 Sol—it is the optimal choice.
Was this recommendation helpful?
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 & Context
Cost (per 1M tokens)
$11.25Input: $5.00 | Output: $30.00Context Window
1.05M tokensBenchmarks & 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 & Context
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
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%.
Related Matchups
Explore similar comparisons for GPT-5.5 and GPT-5.6 Sol.
Do you want to find a model for your constraints?
Use our interactive model finder to filter LLMs by reasoning capability, coding performance, cost, and context length.