Unverified50% confidenceFactExact time

Codex (the 2025 Agent product) is powered under the hood by reasoning models such as o3 and o4-mini

1

Sources

50%

Confidence

Medium-term (~90 days)

Relevance

10/6/2026

First Seen

Valid until: 1/4/2027

Sources

Codex Beginner's Guide: Four Forms & A Deep Comparison of the Top 3 AI Coding Tools

Related Entities

Codexproduct o3model o4-minimodel

Related Claims

UnverifiedCodex's architecture is a combination of a frontend shell and a model inference backend, and the decoupling of the frontend and backend makes it technically possible to replace the underlying model.67% similar

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