GPT‑5.3‑Codex Takes #1 Quality Spot on Microsoft Foundry Leaderboard

Microsoft’s Foundry leaderboard reshuffled right after the launch of GPT‑5.3‑Codex. The model jumped straight to the top in the Quality category, while a combined “podium” metric ranked GPT‑5‑Nano as the overall efficiency leader. Both shifts highlight how quickly new releases reshape the model rankings.