GPT-5 vs Grok 4

Verdict

GPT-5 and Grok 4 are both proprietary large language models, but they differ in several key dimensions. GPT-5 leads in performance with an Arena Elo of 1450 compared to Grok 4's 1420, and offers a significantly larger context window of 400,000 tokens versus 256,000 tokens. Pricing also favors GPT-5 at $1.25/$10 per 1M input/output tokens, while Grok 4 costs $3/$15 per 1M. Both models excel at natural language understanding, generation, reasoning, and coding tasks, but GPT-5's advantage in context length makes it better suited for processing extremely long documents or maintaining coherence across lengthy conversations. Choose GPT-5 if you need the highest performance, longest context handling, and most cost-effective solution for enterprise or high-volume applications. Choose Grok 4 if you prefer xAI's ecosystem or have specific use cases where the 256K context window suffices and the pricing structure aligns with your budget.