GPT-5.4 raises cost for heavy workloads; base rates start at $2.50 per million input tokens and $15 per million output tokens ...
GPT-5.3-Codex moved to No. 1 in Quality on the Microsoft Foundry AI Model Leaderboard soon after release, while a cross-metric 'podium' scoring method put GPT-5-Nano on top overall for efficiency.
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