Non-engineer prefers Claude Code (Opus 5.5) over Codex for new projects
Shiro, a non-engineer who built a SaaS using AI, now relies on Claude Code (Opus 5.5) for new projects instead of OpenAI’s Codex. The shift came after Opus 5.5 relaxed usage limits on the Pro plan, making it easier to handle development tasks without hitting caps. Shiro highlights Opus 5.5’s ability to infer intent better than GPT-6 Astra, reducing back-and-forth exchanges and delivering…
Key points
- Claude Code (Opus 5.5) now feels more reliable for Shiro due to looser Pro plan limits
- Opus 5.5 outperforms GPT-6 Astra for Shiro’s workflow by inferring intent more accurately
- Shiro still uses Codex for legacy projects but prefers Opus 5.5 for new builds
Shiro still uses Codex for maintaining existing projects but notes AI’s rapid evolution means tools may change quickly. Their key takeaway: the focus should be on clarifying project goals rather than picking the ‘best’ AI. A prior article details how their SaaS secured ¥34,800/month in contracts within its first month, despite early failures with Codex.
Model pages: GPT-6 Astra → · Opus 5.5 →
The story so far
2 episodes →- Non-engineer prefers Claude Code (Opus 5.5) over Codex for new projectsthis story
Why I, a non-engineer, started entrusting new projects to Claude Code (Opus 5.5)
note.com · 29 September 2026
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