Claude Opus 4.5
No content available for this output.
Claude Opus 4.5 vs GPT-5 Codex
Compare Claude Opus 4.5 by Anthropic against GPT-5 Codex by OpenAI, tested across 50 shared challenges. Updated February 2026.
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Claude Opus 4.5vsGPT-5 Codex
45 challenges
Why Claude Opus 4.5?
Leads 1 of 1 benchmarks
Stronger on SWE-bench Verified80.9% vs 74.5%
2 months newerNov 2025
Why GPT-5 Codex?
No standout advantages
Favorites
Claude Opus 4.5GPT-5 Codex
12 / 45
Estimate Complexityreasoning
Tests an AI's ability to make educated estimates based on technical knowledge
GPT-5 Codex
No content available for this output.
Vote
2 / 45
AI Board Game Logicreasoning
Tests an AI's ability to understand game rules and strategy
Claude Opus 4.5
No content available for this output.
GPT-5 Codex
No content available for this output.
Vote
3 / 45
Logic Puzzlereasoning
Tests an AI's ability to solve a simple but potentially confusing logic puzzle
Claude Opus 4.5
No content available for this output.
GPT-5 Codex
No content available for this output.
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4 / 45
Math Misconception Testreasoning
Tests an AI's understanding of number representation
Claude Opus 4.5
No content available for this output.
GPT-5 Codex
No content available for this output.
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5 / 45
Stochastic Consistency Testanalysis
Tests an AI's randomness and creativity
Claude Opus 4.5
No content available for this output.
GPT-5 Codex
No content available for this output.
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6 / 45
SVG Layout Challengeimage generation
Tests an AI's ability to generate vector graphics
Claude Opus 4.5
No content available for this output.
GPT-5 Codex
No content available for this output.
Vote
7 / 45
Xbox Controller SVG Artimage generation
Tests an AI's ability to create detailed SVG illustrations of gaming hardware
Claude Opus 4.5
No content available for this output.
GPT-5 Codex
No content available for this output.
Vote
8 / 45
Generate a Stand-Up Routineconversation
Tests an AI's humor and creative writing ability
Claude Opus 4.5
No content available for this output.
GPT-5 Codex
No content available for this output.
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9 / 45
Realistic AI Interviewconversation
Tests an AI's ability to simulate personalities and predict future trends
Claude Opus 4.5
No content available for this output.
GPT-5 Codex
No content available for this output.
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10 / 45
Satirical Fake News Headlineconversation
Tests an AI's humor and understanding of current events
Claude Opus 4.5
No content available for this output.
GPT-5 Codex
No content available for this output.
Vote
11 / 45
Character Voice Testconversation
Tests an AI's ability to write in distinct character voices
Claude Opus 4.5
No content available for this output.
GPT-5 Codex
No content available for this output.
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12 / 45
Minimalist Landing Pageweb design
Tests an AI's ability to generate a complete, working landing page
Claude Opus 4.5
GPT-5 Codex
Vote
12 of 45