OpenAI wants a head-to-head with Claude Code—using your own work
Build 8881 targets successful Claude Code importers with a plugin that reruns an imported task in Codex for a direct comparison.
By Ryan Merket · Published
RUNTIMEWIRE INVESTIGATION — Original analysis
Original reporting by RuntimeWire, based on documents, reverse engineering.
Why it matters
Codex Replay would turn migration into an acquisition funnel: import successful Claude Code work, rerun it in Codex, and judge the switch on a task that already matters.
Reporting record
Finding
RuntimeWire established that Codex build 8881 contains a Claude Code-specific onboarding invitation that offers successful importers a Codex Replay plugin to rerun an imported coding task and compare results.
How we verified
Methods: documents, reverse engineering.
Static inspection of the uploaded openai-codex-electron archive, package version 26.908.40834, build 8881, found the invitation text, Claude Code eligibility predicate, codex-replay plugin installation flow, open_controller integration, and Codex Replay conversation handler.
RuntimeWire statically extracted and inspected the user-supplied archive, traced UI components, imports, eligibility checks, plugin-installation actions, and conversation handlers, and conducted public-source checks. The archive was not executed or modified, and no feature flags, plugins, account endpoints, purchases, or imported-task runs were tested.
Tested versions:
- Codex desktop client 26.908.40834 (build 8881)
Reproduction
RuntimeWire partially reproduced the finding.
Unpack / reverse the silly app.asar file for node and go fishing.
File hashes
app.asar - 2bd5b96a48232f3ccf3df6be50965920699ea3a1b4512dcdd770e209fd1f009e
Company response
RuntimeWire requested comment; the company had not responded by publication time.
OpenAI is building a Codex feature that invites developers to rerun work imported from Claude Code and compare the result, turning the migration process into a product trial built around a user's own coding task.
RuntimeWire found the feature, called Codex Replay, in production build 8881 of OpenAI's Codex desktop client, inspected on September 14th. The bundled interface tells eligible users: "Replay a task you imported from another agent and compare the results."…
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