GPT-5.3 Instant reduces hallucinations by 26.8% on web queries and 19.7% on internal knowledge — OpenAI's most-used model now prioritizes accuracy and fewer refusals over raw performance gains.
Microsoft has made GPT-5.3 Instant available in Microsoft 365 Copilot, introducing a new model option designed to deliver faster response times for users across Microsoft 365 Copilot and Microsoft ...
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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