SpaceXAI: Grok 4.6 vs OpenAI: GPT-5.6 Sol

For a sample job of 1 million input tokens and 250,000 output tokens, Grok 4.6 costs $3.50 and GPT-5.6 Sol costs $4.50, so Grok 4.6 is about 1.3 times cheaper for the same work.

GPT-5.6 Sol reads up to 1,050,000 tokens at once, roughly 1,575 pages of text, against about 750 pages for Grok 4.6.

On our blended benchmark score GPT-5.6 Sol leads 80.2 to 75.3.

Across the 20 tasks where they differ, Grok 4.6 scores higher on 7 (Code Completion, Code Documentation, Regex Writing and others), GPT-5.6 Sol on 13 (SQL Generation, Code Review, Code Refactoring and others).

Grok 4.6 was released in August 2026 and GPT-5.6 Sol in July 2026.

Pick Grok 4.6 if you need lower cost; pick GPT-5.6 Sol if you need long documents or benchmark performance.

Costs use current list prices per million tokens; page counts assume about 0.75 words per token and 500 words per page.