Expired75% confidenceFactTime unknown
The model behind Codex is Codex One, which is based on the O3 reasoning model and has been fine-tuned for software engineering tasks.
5
Sources
75%
Confidence
Medium-term (~90 days)
Relevance
5/31/2026
First Seen
Valid until: 8/29/2026(expired)
Sources
OpenAI Codex Deep Dive: How Does the Async AI Coding Agent Actually Perform?
bilibiliKrillinAI小林
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UnverifiedCodex introduced a goal-driven mode that uses a small model as a 'judge' to determine whether a task has been completed69% similarUnverifiedCodex的计划模式机制理论基础来自大语言模型领域的思维链推理（Chain-of-Thought Reasoning）67% similarUnverifiedCodex uses a reasoning model optimized with reinforcement learning and excels at multi-step logical reasoning and code debugging.67% similarVerifiedCodex 2.0's tool-calling system adopts the ReAct (Reasoning + Acting) pattern, in which the model alternates between reasoning and acting.66% similarUnverifiedCodex represents a paradigm shift from "language model" to "Action Model," introducing a perception-planning-execution loop whose core components include tool invocation, memory management, and feedback loops.66% similar
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