OpenAI GPT-5.5 Pro VS OpenAI GPT-5.6 Terra
Decision Recommendation
⚖️ Editorial Verdict: In our analysis, GPT-5.6 Terra is the premium intelligence choice, scoring 63.4% higher on coding benchmarks. It also maintains strong cost efficiency. If you are building high-volume, simple chatbots or processing massive amounts of text where budget is critical, GPT-5.5 Pro offers excellent cost savings. For agentic reasoning, code refactoring, or complex logical tasks, the accuracy premium of GPT-5.6 Terra fully justifies the cost.
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Model 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)Winner (+3.3%)
96.2%graduate-level science QA
Cost & Performance
Cost (per 1M tokens)
$67.50Input: $30.00 | Output: $180.00Context Window
1.05M tokensModel Specs
GPT-5.6 Terra
Benchmarks & 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 & Performance
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 comparison
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.
GPT-5.6 Terra is better for coding tasks on this benchmark. It scores 63.4% 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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