What are the key differences between GPT-4o and OpenAI Codex?

Compare GPT-4o and OpenAI Codex side by side on Lunoo to see detailed feature differences, AI scores, and expert analysis.

How are GPT-4o and OpenAI Codex scored?

GPT-4o has an AI score of 9.22/10 and OpenAI Codex has an AI score of 8.88/10. Scores are based on category fit, feature coverage, pricing signals, public reception, and recency.

GPT-4o vs OpenAI Codex 2026 - Compared

GPT-4o

OpenAI Codex

WINNER GPT-4o

GPT-4o edges ahead with a score of 9.2/10 compared to 8.9/10 for OpenAI Codex. While both are highly rated in their resp...

emoji_events WINNER

GPT-4o

9.22 Excellent

Multimodal AI Get GPT-4o open_in_new

OpenAI Codex

8.88 Great

Coding Assistant Get OpenAI Codex open_in_new

psychology AI Verdict

GPT-4o edges ahead with a score of 9.2/10 compared to 8.9/10 for OpenAI Codex. While both are highly rated in their respective fields, GPT-4o demonstrates a slight advantage in our AI ranking criteria. A detailed AI-powered analysis is being prepared for this comparison.

emoji_events Winner: GPT-4o

verified Confidence: Low

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description Overview

GPT-4o

GPT-4o represents a significant leap in OpenAI's language model capabilities. It boasts dramatically improved speed, responsiveness, and multimodal understanding (text, audio, vision). Its ability to engage in natural, real-time conversations with nuanced emotional awareness sets it apart. While still under development, GPT-4o is rapidly becoming the gold standard for generative AI applications ac...

OpenAI Codex

OpenAI Codex turns natural-language instructions into coding work, helping developers create and modify software in multiple programming languages. The name now refers to a coding agent rather than only the earlier code-generating model. Depending on its environment and permissions, it can examine project files, make edits and run commands to check its work. OpenAI describes these environments in...