grok-4.3 edges gpt-5.4-nano on execution, not flash

Grok-4.3 scored 33.8 against GPT-5.4 Nano's 33.4 in a head-to-head evaluation, with the split revealing distinct strengths. GPT-5.4 Nano outperformed in writing tasks, including Python log redaction and customer email composition, demonstrating superior attention to detail and editorial tone. Grok-4.3's edge came from execution in other areas, though the narrow margin highlights a competitive gap in language-focused applications.

The score says nail biter — 33.8 to 33.4 — but the split is revealing. gpt 5.4 nano took both writing adjacent tasks: python log redaction fix and release delay customer email . In the log redaction task, B was simply more careful: it preserved separators and existing quotes better, and it dealt more explicitly with quoted JSON style values. In the customer email, B also had the stronger editorial instinct, matching the requested candid tone and laying out options more cleanly. But grok 4.3 w...