GPT-5.1 Codex Max
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GPT-5.1 Codex Max vs xAI: Grok 4
Compare GPT-5.1 Codex Max by OpenAI against xAI: Grok 4 by xAI, tested across 38 shared challenges. Updated February 2026.
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GPT-5.1 Codex MaxvsxAI: Grok 4
38 challenges
Why GPT-5.1 Codex Max?
5 months newerDec 2025
Why xAI: Grok 4?
No standout advantages
Favorites
GPT-5.1 Codex MaxxAI: Grok 4
12 / 38
Estimate Complexityreasoning
Tests an AI's ability to make educated estimates based on technical knowledge
xAI: Grok 4
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Vote
2 / 38
Logic Puzzlereasoning
Tests an AI's ability to solve a simple but potentially confusing logic puzzle
GPT-5.1 Codex Max
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xAI: Grok 4
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3 / 38
Stochastic Consistency Testanalysis
Tests an AI's randomness and creativity
GPT-5.1 Codex Max
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xAI: Grok 4
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4 / 38
SVG Layout Challengeimage generation
Tests an AI's ability to generate vector graphics
GPT-5.1 Codex Max
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xAI: Grok 4
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5 / 38
Xbox Controller SVG Artimage generation
Tests an AI's ability to create detailed SVG illustrations of gaming hardware
GPT-5.1 Codex Max
No content available for this output.
xAI: Grok 4
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6 / 38
Realistic AI Interviewconversation
Tests an AI's ability to simulate personalities and predict future trends
GPT-5.1 Codex Max
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xAI: Grok 4
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7 / 38
Satirical Fake News Headlineconversation
Tests an AI's humor and understanding of current events
GPT-5.1 Codex Max
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xAI: Grok 4
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8 / 38
Character Voice Testconversation
Tests an AI's ability to write in distinct character voices
GPT-5.1 Codex Max
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xAI: Grok 4
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9 / 38
Minimalist Landing Pageweb design
Tests an AI's ability to generate a complete, working landing page
GPT-5.1 Codex Max
xAI: Grok 4
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10 / 38
Pokémon Battle UI Recreationweb design
Recreate an interactive, nostalgic Pokémon battle UI in a single HTML file.
GPT-5.1 Codex Max
No content available for this output.
xAI: Grok 4
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11 / 38
Mario Level UI Recreationweb design
Recreate an interactive, classic Mario level in a single HTML file.
GPT-5.1 Codex Max
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xAI: Grok 4
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12 / 38
Linear App Cloneweb design
Tests an AI's ability to replicate an existing UI with Tailwind CSS
GPT-5.1 Codex Max
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xAI: Grok 4
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12 of 38