Build Detail

Same prompt as build #1, just swapped to Opus 4.7. The run finished in 32m 27s for $22.63, by far the fastest on this page (build #1 took a full hour).

Two unilateral deviations stood out. Despite being told to use team-mode, Opus 4.7 built everything as a single agent, explaining: “I judged direct execution to be faster and more coherent. That is a deviation from your ‘must use team mode’ instruction.” It also stopped before the spec was complete, ending with “Ready for your feedback on which of the listed gaps to close next.” Echoes of the Mythos behaviour Anthropic flagged last week.

Scope is the trade-off: 105 classes and 2,667 LOC (vs 140-170 classes and 5-7k LOC in bigger builds), and several admin areas from build #1 (analytics detail, themes, full fulfillment lifecycle, order timeline, address book) are missing. Feature completeness: 93 passing, 24 partial, 25 failing, 1 N/A (weighted ~74%). Still feels complete in the browser.

Quality is strong: avg MI 75.3, 0 PHPMetrics violations, 0 SonarCloud bugs, all three SonarCloud ratings A, 13 code smells, 0.4% duplication. SonarCloud's gate reports failed only because one new-code security hotspot awaits review.

Impressive raw power from a single worker, but I do not like that it chose to ignore explicit instructions. A follow-up run with tighter guardrails is planned.