Claude Opus 5 still needed iterations to build a custom racing game
mattshumer_ · x · 2026-07-29
A user says a car-racing game built from a prompt worked much better after a few iterations, even though Claude Opus 5 could not one-shot it after 18+ hours.
The post highlights two concrete takeaways:
- the demo includes custom code only, with no external assets;
- the author’s independent harnesses use build, verify, and critique loops (“gauntlet loops”) that materially improved final product quality.
It’s a small but useful data point for people experimenting with agentic coding workflows.
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