Codex Completes Tasks After Quota Exhaustion, Powering Hardcore 10k-Line C Generation

OpenAI Codex continues to execute and complete ongoing tasks even after hitting its usage limits, a design choice that successfully supported an incredibly hardcore AI coding experiment.

已确认

When reaching usage limits, Codex does not immediately interrupt the current run. Instead, it allows the active target prompt to finish the next step or run the entire task to completion. This marks a key difference from tools like Claude Code, which @JFPuget noted will directly halt tasks when quotas are exhausted.
@jdjohnson previously experienced a direct task stoppage due to exhausted limits while running a long task with sub-agents in Fable, losing 5 hours of progress. He highly praised Codex's mechanism for gracefully completing the current step before enforcing the limit.
@yacineMTB leveraged this feature to accomplish a hardcore challenge: he completely exhausted his Codex quota around 3 AM, yet the prompt task continued executing into the next day.

为什么重要

This mechanism is crucial for long, complex programming tasks. According to @yacineMTB, he was using a custom memory inspection tool based on the Dolphin 模拟器, requiring the AI to generate a C language header file of up to 1 万行.
This header file needed to perfectly match the state of a "Marth vs Marth" game on the "Final Destination" map in Super Smash Bros. Without this protection against quota exhaustion, such extreme generation tasks—requiring massive compute and time—would face a high risk of losing all progress.

2026-08-02 ~ 2026-08-04 · 5 related posts

Primary sources

A custom Dolphin-memory tool is generating a 10,000-line C header file bit-for-bit — yacineMTB · 2026-08-04 02:01 (UTC+08:00)
Codex Finishes Current Step After Hitting Usage Limits, Saving Long Tasks — jdjohnson · 2026-08-02 21:11 (UTC+08:00)

[source] Codex Finishes Current Step After Hitting Usage Limits, Saving Long Tasks — jdjohnson · 2026-08-02
A Codex prompt kept running after the user burned through all credits — yacineMTB · 2026-08-04
[source] A custom Dolphin-memory tool is generating a 10,000-line C header file bit-for-bit — yacineMTB · 2026-08-04
AI + Emulator Memory Tool Generates 10,000 Lines of Bit-Identical C Code — yacineMTB · 2026-08-04
Codex keeps running after credits expire, unlike Claude Code — JFPuget · 2026-08-04