GPT-4.5 vs xAI: Grok 4.3
Compare GPT-4.5 by OpenAI against xAI: Grok 4.3 by xAI, context windows of 128K vs 1.0M, tested across 24 shared challenges. Updated May 2026.
Which is better, GPT-4.5 or xAI: Grok 4.3?
GPT-4.5 and xAI: Grok 4.3 are both competitive models. GPT-4.5 costs $75/M input tokens vs $1.25/M for xAI: Grok 4.3. Context windows: 128K vs 1000K tokens. Compare their real outputs side by side below.
Key Differences Between GPT-4.5 and xAI: Grok 4.3
GPT-4.5 is made by openai while xAI: Grok 4.3 is from xai. GPT-4.5 has a 128K token context window compared to xAI: Grok 4.3's 1000K. On pricing, GPT-4.5 costs $75/M input tokens vs $1.25/M for xAI: Grok 4.3.
Per 1M tokens
xAI: Grok 4.3 is cheaper on both — 60× input, 60× output
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
xAI: Grok 4.3 is 60x cheaper per token — worth considering if cost matters.
Style Comparison
GPT-4.5 uses 3.8x more transitions
