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OpenAI’s Codex now available to ChatGPT Plus users

ChatGPT Plus-tier gets access to Codex!
Wider availability for Codex likely means even more pressure on the coding market. (Picture: Chatgpt.com)
Caught this morning, there seems to be a new option in the sidebar at Chatgpt.com for the new Codex coding model — meaning it has expanded access.

Codex is the latest coding agent from OpenAI that runs on a modified o3-model.

Super-coding agent
It can generate several instances of code from your prompts, and even run them in a sandbox to select the best/most efficient version.

OpenAI says it can complete tasks autonomously that would otherwise take hours or days to finish, and they are using it themselves to offload repetitive tasks.

The Plus membership for ChatGPT is $20 a month, and Codex launched as a «research preview» in May for Pro users, who fork out $200 a month.

Update: It appears Codex now also has Internet acccess, which is off by default and comes with a stern warning.

See also: teknotum on the Codex launch, and the announcement thread on X.

Author Tor FosheimPosted on 4. June 20254. June 2025Tags AI, chatgpt, coding, openai, work

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