GPT-5 Codex
No content available for this output.
GPT-5 Codex vs GPT OSS 20B
Compare GPT-5 Codex and GPT OSS 20B, both from OpenAI, tested across 50 shared challenges. Updated February 2026.
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GPT-5 CodexvsGPT OSS 20B
45 challenges
Why GPT-5 Codex?
2 months newerSep 2025
Why GPT OSS 20B?
No standout advantages
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GPT-5 CodexGPT OSS 20B
12 / 45
Estimate Complexityreasoning
Tests an AI's ability to make educated estimates based on technical knowledge
GPT OSS 20B
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2 / 45
AI Board Game Logicreasoning
Tests an AI's ability to understand game rules and strategy
GPT-5 Codex
No content available for this output.
GPT OSS 20B
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3 / 45
Logic Puzzlereasoning
Tests an AI's ability to solve a simple but potentially confusing logic puzzle
GPT-5 Codex
No content available for this output.
GPT OSS 20B
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4 / 45
Math Misconception Testreasoning
Tests an AI's understanding of number representation
GPT-5 Codex
No content available for this output.
GPT OSS 20B
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5 / 45
Stochastic Consistency Testanalysis
Tests an AI's randomness and creativity
GPT-5 Codex
No content available for this output.
GPT OSS 20B
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6 / 45
SVG Layout Challengeimage generation
Tests an AI's ability to generate vector graphics
GPT-5 Codex
No content available for this output.
GPT OSS 20B
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7 / 45
Xbox Controller SVG Artimage generation
Tests an AI's ability to create detailed SVG illustrations of gaming hardware
GPT-5 Codex
No content available for this output.
GPT OSS 20B
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8 / 45
Generate a Stand-Up Routineconversation
Tests an AI's humor and creative writing ability
GPT-5 Codex
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GPT OSS 20B
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9 / 45
Realistic AI Interviewconversation
Tests an AI's ability to simulate personalities and predict future trends
GPT-5 Codex
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GPT OSS 20B
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10 / 45
Satirical Fake News Headlineconversation
Tests an AI's humor and understanding of current events
GPT-5 Codex
No content available for this output.
GPT OSS 20B
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11 / 45
Character Voice Testconversation
Tests an AI's ability to write in distinct character voices
GPT-5 Codex
No content available for this output.
GPT OSS 20B
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12 / 45
Minimalist Landing Pageweb design
Tests an AI's ability to generate a complete, working landing page
GPT-5 Codex
GPT OSS 20B
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12 of 45