OpenAI GPT-5.6 Sol VS xAI Grok 4.20
Decision Recommendation
⚖️ Editorial Verdict: In our analysis, GPT-5.6 Sol is the premium intelligence choice, scoring 12.8% higher on coding benchmarks. However, this accuracy premium comes with a cost overhead: Grok 4.20 is 3.8x cheaper to run. If you are building high-volume, simple chatbots or processing massive amounts of text where budget is critical, Grok 4.20 offers excellent cost savings. For agentic reasoning, code refactoring, or complex logical tasks, the accuracy premium of GPT-5.6 Sol fully justifies the cost.
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Model Specs
GPT-5.6 Sol
Benchmarks & Scores
Coding (swe-bench-pro)Winner (+12.8%)
64.6%excellent at multi-file repositories, autonomous agents, and industrial codebases
Reasoning (gpqa-diamond)Winner (+4.6%)
94.6%graduate-level science QA
Cost & Performance
Cost (per 1M tokens)
$11.25Input: $5.00 | Output: $30.00Context WindowLarger
1.05M tokensModel Specs
Grok 4.20
Benchmarks & Scores
Coding (swe-bench-pro)
51.8%excellent at multi-file repositories, autonomous agents, and industrial codebases
Reasoning (gpqa-diamond)
90%graduate-level science QA
Cost & Performance
Cost (per 1M tokens)3.8x cheaper
$3.00Input: $2.00 | Output: $6.00Context Window
1M tokensFrequently Asked Questions about GPT-5.6 Sol vs Grok 4.20 comparison
Grok 4.20 is cheaper than GPT-5.6 Sol. Grok 4.20 has a blended cost of $3.00/1M tokens, which is about 3.8x cheaper than GPT-5.6 Sol at $11.25/1M 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 Grok 4.20 which scores 51.8%.
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