"We codex maxxed" twice in September. What's actually burning your credits?

A heavy user of Claude Code and Codex experienced significant credit consumption in September, exhausting 256K credits in two weeks and an additional 150K within ten days. This led to team members being "codex maxxed" and unable to continue sessions. Analysis revealed one session consumed 3.2B input tokens across 2,400 writes. Work on gpt-6-astra averaged $21 per session, significantly higher than gpt-5.6-terra at $1, with Astra accounting for 38% of the Codex bill in 31 person-days.