GPT-5.1-Codex-Mini vs xAI: Grok 4
Compare GPT-5.1-Codex-Mini by OpenAI against xAI: Grok 4 by xAI, context windows of 400K vs 256K, tested across 53 shared challenges. Updated April 2026.
Which is better, GPT-5.1-Codex-Mini or xAI: Grok 4?
GPT-5.1-Codex-Mini and xAI: Grok 4 are both competitive models. GPT-5.1-Codex-Mini costs $1.5/M input tokens vs $3/M for xAI: Grok 4. Context windows: 400K vs 256K tokens. Compare their real outputs side by side below.
Key Differences Between GPT-5.1-Codex-Mini and xAI: Grok 4
GPT-5.1-Codex-Mini is made by openai while xAI: Grok 4 is from xai. GPT-5.1-Codex-Mini has a 400K token context window compared to xAI: Grok 4's 256K. On pricing, GPT-5.1-Codex-Mini costs $1.5/M input tokens vs $3/M for xAI: Grok 4.
No community votes yet. On paper, GPT-5.1-Codex-Mini has the edge — bigger model tier, newer, bigger context window.
Style Comparison
xAI: Grok 4 uses 7.0x more emoji
vs
Ask them anything yourself
Some models write identically. You are paying for the brand.
178 models fingerprinted across 32 writing dimensions. Free research.
185x
price gap between models that write identically
178
models
12
clone pairs
32
dimensions
279 AI models invented the same fake scientist.
We read every word. 250 models. 2.14 million words. This is what we found.
