OpenAI Codex · one session · 25 and 26 October 2026

How Codex built Twinclue

Eight turns of one Codex session, replayed from its raw logs. You can see every message Codex wrote, every command it ran, every file it edited and every test run. Open a turn to replay it.

Codex built slices 1 to 5c. When the plan's usage limit was reached, another AI coding assistant built the later slices under the same rules. CODEX.md in the repository lists every commit and who built it.

• Message
• Command
• Non-zero exit
• Green test run
• File edit
• Codex runtime error