OpenAI GPT-5.6 Luna VS xAI Grok 4.5
⚖️Our Take
Both models perform almost identically, with an average score gap of just 1.4%. We recommend choosing GPT-5.6 Luna as it is the more cost-effective option (being 1.3x cheaper) without sacrificing any real-world capability.
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Benchmarks & Scores
Coding (swe-bench-pro)
62.7%excellent at multi-file repositories, autonomous agents, and industrial codebases
Reasoning (gpqa-diamond)
92.3%graduate-level science QA
Cost & Performance
Cost (per 1M tokens)1.3x cheaper
$2.25Input: $1.00 | Output: $6.00Context WindowLarger
1.05M tokensBenchmarks & Scores
Coding (swe-bench-pro)Winner (+2.0%)
64.7%excellent at multi-file repositories, autonomous agents, and industrial codebases
Reasoning (gpqa-diamond)Winner (+0.7%)
93%graduate-level science QA
Cost & Performance
Cost (per 1M tokens)
$3.00Input: $2.00 | Output: $6.00Context Window
500k tokensFrequently Asked Questions about GPT-5.6 Luna vs Grok 4.5 comparison
GPT-5.6 Luna is cheaper than Grok 4.5. GPT-5.6 Luna has a blended cost of $2.25/1M tokens, which is about 1.3x cheaper than Grok 4.5 at $3.00/1M tokens.
Grok 4.5 is better for coding tasks on this benchmark. It scores 64.7% on swe-bench-pro (excellent at multi-file repositories, autonomous agents, and industrial codebases) compared to GPT-5.6 Luna which scores 62.7%.
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