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How Codex works under the hood: App Server, remote access, and building your own

BACKGROUND
1 SIGNALFIRST DETECTED 30 March 2026
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14 May
Now in preview: Codex mobile in the ChatGPT mobile app.

<table> <tr><td> <a href="https://www.reddit.com/r/ChatGPT/comments/1tddpsz/now_in_preview_codex_mobile_in_the_chatgpt_mobile/"> <img alt="Now in preview: Codex mobile in the

OPINION · WHAT · ChatGPTOPEN STORY
9 May
How OpenAI runs its Codex coding agent safely at scale

<table> <tr><td> <a href="https://www.reddit.com/r/OpenAI/comments/1t8aezx/how_openai_runs_its_codex_coding_agent_safely_at/"> <img alt="How OpenAI runs its Codex coding agent

OPINION · HOW · OpenAIOPEN STORY
14 May
Work with Codex from anywhere | OpenAI

<table> <tr><td> <a href="https://www.reddit.com/r/ChatGPT/comments/1td9x84/work_with_codex_from_anywhere_openai/"> <img alt="Work with Codex from anywhere | OpenAI"

OPINION · WHAT · ChatGPTOPEN STORY
9 May
How OpenAI runs its Codex coding agent safely at scale

<table> <tr><td> <a href="https://www.reddit.com/r/ChatGPT/comments/1t8afhg/how_openai_runs_its_codex_coding_agent_safely_at/"> <img alt="How OpenAI runs its Codex coding agent

OPINION · HOW · ChatGPTOPEN STORY
26 Apr
made a tool to run multiple codex cli profiles at once

<!-- SC_OFF --><div class="md"><p>codex cli stores everything in one folder so you can only use one account at a time. if you have multiple openai accounts for different projects

OPINION · WHERE · OpenAIOPEN STORY
16 Apr
Codex for (almost) everything

&#32; submitted by &#32; <a href="https://www.reddit.com/user/madredditscientist"> /u/madredditscientist </a> <br /> <span><a

OPINION · WHAT · OpenAIOPEN STORY
4 Feb
Unlocking the Codex harness: how we built the App Server

Learn how to embed the Codex agent using the Codex App Server, a bidirectional JSON-RPC API powering streaming progress, tool use, approvals, and diffs.

REPORT · HOW · OpenAI NewsOPEN STORY
22 Sept
I built a way to test what Codex just changed from my phone: my Mac builds it and streams the simulator to me

<table> <tr><td> <a href="https://www.reddit.com/r/OpenAI/comments/1wnib22/i_built_a_way_to_test_what_codex_just_changed/"> <img alt="I built a way to test what Codex just changed

OPINION · HOW · OpenAIOPEN STORY
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