OpenAIGPT-5.5 ProVSOpenAIGPT-5.6 Terra
Our Take
Standardized reasoning and coding benchmarks are currently pending verification for one or both of these models. We recommend testing GPT-5.5 Pro and GPT-5.6 Terra directly in their respective provider playgrounds to see which fits your specific prompt styles best.
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Benchmarks & Scores
Coding (swe-bench-pro)
N/Aexcellent at multi-file repositories, autonomous agents, and industrial codebases
Reasoning (gpqa-diamond)Winner (+3.3%)
96.2%graduate-level science QA
Cost & Context
Cost (per 1M tokens)
$67.50Input: $30.00 | Output: $180.00Context Window
1.05M tokensBenchmarks & Scores
Coding (swe-bench-pro)
63.4%excellent at multi-file repositories, autonomous agents, and industrial codebases
Reasoning (gpqa-diamond)
92.9%graduate-level science QA
Cost & Context
Cost (per 1M tokens)12.0x cheaper
$5.63Input: $2.50 | Output: $15.00Context Window
1.05M tokensFrequently Asked Questions about GPT-5.5 Pro vs GPT-5.6 Terra
GPT-5.6 Terra is cheaper than GPT-5.5 Pro. GPT-5.6 Terra has a blended cost of $5.63/1M tokens, which is about 12.0x cheaper than GPT-5.5 Pro at $67.50/1M tokens.
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