米OpenAIは2月5日（現地時間）、「GPT-5.3-Codex」を発表した。推論と専門知識にすぐれるフラグシップモデル「GPT-5.2」と、それをコーディングに特化させた「GPT-5.2-Codex」を一つのモデルにまとめて、さらに25％高速化。

Anthropicが「Claude Opus 4.6」を発表した直後、OpenAIは「GPT-5.3-Codex」を公開した。GPT-5.2-Codexのコーディング能力とGPT-5.2の推論・専門知識を統合し、性能を強化。複数エージェントの操作や管理を円滑にする機能も盛り込まれている。

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