Expired65% confidenceEventTime unknown
ThePrimeagen tested Claude Opus 4.6 and GPT 5.3 Codex on the same day, pitting them against each other in a coding battle using identical tasks.
3
Sources
65%
Confidence
Medium-term (~90 days)
Relevance
6/2/2026
First Seen
Valid until: 8/31/2026(expired)
Sources
Related Entities
Related Claims
UnverifiedThe two projects tested had previously gone through one round of development using a combination of Claude Opus 4.5 and GPT-5.5.77% similarUnverifiedThe article compares GPT-5.2 Codex against Anthropic's Opus 4.5 through multiple real-world test cases including frontend generation, physics simulation, 3D scene rendering, and code refactoring.76% similarUnverifiedIn a domino physics simulation test, Opus 4.5 completed five formation designs with a single prompt, while GPT-5.2 Codex required two prompts to reach a basically usable state.73% similar
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