Grok 3 vs GPT-5.1-Codex-Mini

Compare Grok 3 by xAI against GPT-5.1-Codex-Mini by OpenAI, context windows of 128K vs 400K, tested across 28 shared challenges. Updated March 2026.

Which is better, Grok 3 or GPT-5.1-Codex-Mini?

Grok 3 and GPT-5.1-Codex-Mini are both competitive models. Context windows: 128K vs 400K tokens. Compare their real outputs side by side below.

Key Differences Between Grok 3 and GPT-5.1-Codex-Mini

Grok 3 is made by xai while GPT-5.1-Codex-Mini is from openai. Grok 3 has a 128K token context window compared to GPT-5.1-Codex-Mini's 400K.

Our Verdict
GPT-5.1-Codex-Mini
GPT-5.1-Codex-Mini
Grok 3
Grok 3Runner-up

No community votes yet. On paper, GPT-5.1-Codex-Mini has the edge — newer, bigger context window.

Too close to call

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