Grok vs. GPT-5.6 Sol: AI Index Score & Pricing Revealed

Grok 4.6 and GPT-5.6 Sol both score 61 on the Artificial Analysis Intelligence Index. What's interesting is their pricing: Grok costs $2 per million input tokens and $6 per million output tokens, while Sol is $5 for input and $30 for output. This makes Grok significantly cheaper for some tasks. However, Sol offers a much larger context window at 1.05 million tokens, more than double Grok's 500,000 tokens. Benchmark results are split, with Grok leading in some knowledge-work and coding tests. Sol performs better on DeepSWE and Terminal-Bench. The bottom line is that no single model wins every category, so buyers must weigh cost against specific performance needs. This means choosing an AI model now depends on your specific application and budget.