Sam Altman’s GPT-5.6 vs Elon Musk’s Grok 4.5 in the ultimate AI faceoff

Sam Altman calls his latest GPT-5.6 model “magical and real”. Meanwhile, Elon Musk is proud to present Grok 4.5 as an AI model that scores almost as high as Anthropic’s Claude Fable 5 on benchmarks while costing one-fourth its price! Two flagship-tier AI models from two frontier software developers. But which one suits your needs better?

Let’s begin with GPT-5.6. OpenAI’s GPT-5.6 series model finally releases to the public following the delays over national security reviews. The latest version of the model powering ChatGPT promises to be as capable as Anthropic’s Claude Opus 4.7, and is divided in three tiers – Sol, Terra and Luna, with Sol being the most capable one.