Tested: GPT-5.4 Nano Outperforms Opus in Planning
Lonely_Sir5876 · reddit · 2026-07-07
User tests claim that using GPT-5.4 Nano via API (rather than Codex or as an agent)—with both verbosity and reasoning set to High—outperforms Opus, Sonnet, and open-source models in generating implementation plans, analyzing code, and proposing solutions.
The author provides a reproducible method: top up around $5, connect to the API via a non-agent chat client, and attach the code files. A single run costs only a few cents, with an overall rating of 10/10.
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