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Hands-on: Claude Opus 4.6 nails non‑agentic coding; GPT‑5.3 Codex lacks API

A 48-hour hands-on found Claude Opus 4.6 delivering perfect non-agentic coding results while GPT‑5.3 Codex looks strong in benchmarks but still lacks API access for validation. In this test-run, Opus 4.6 hit 100% across 11 single-shot coding tasks (including 3D layout, SVG composition, and legal-move chess) and contradicted popular benchmark narratives, while Codex couldn’t be reproduced due to no API access yet per this report [I Spent 48 Hours Testing Claude Opus 4.6 & GPT-5.3 Codex](https://medium.com/@info.booststash/i-spent-48-hours-testing-claude-opus-4-6-gpt-5-3-codex-004adc046312)[^1]. [^1]: Adds: hands-on results, examples, benchmark context, and note on GPT‑5.3 Codex API unavailability.