ChatGPT and Codex May Share a Usage Limit Starting in December

A hidden warning in the ChatGPT web app says ChatGPT and Codex will share one usage limit under a subscription plan, possibly tied to ongoing Chat and Work integration.
A new hidden warning has appeared in the ChatGPT web app about shared usage limits. It is shown when users subscribe to a plan.
“Starting in December, ChatGPT and Codex will share a single usage limit within your subscription plan.”
The change is likely related to ongoing work on merging Chat and Work.
If the warning is accurate, paid users may receive a shared resource pool for ChatGPT and tools such as Codex instead of separate limits for each product.
Why it matters
AnalysisA shared limit could change how paid users allocate capacity between conversational AI, coding, and agent workflows.
Discuss in community
Share your questions and insights with developers
Related in Ecosystem
Practical guides, core terminology, and agent skills
OpenAI cuts ChatGPT Pro usage limits from 20x to 10x Plus
After October 29, OpenAI will reduce ChatGPT Pro usage limits from 20 times to 10 times the Plus subscription volume while keeping the $200 monthly price unchanged.
OpenAI doubles usage limits for ChatGPT Pro and Business Premium
The changes affect Pro 100, Pro 200, Pro 500 and Business Premium plans, and the reduction for Pro 200 has been cancelled.
ChatGPT Updates: Plugin Development and Codex Workflows
Comprehensive engineering guide to creating, packaging, testing, and submitting plugins for ChatGPT and Codex: manifest specification, MCP servers, lifecycle hooks, custom marketplaces, and OpenAI review.
Codex Skills for Beginners: Automating AI Agent Workflows
A comprehensive hands-on guide to building and executing Codex Skills: SKILL.md anatomy, explicit vs. auto-triggering, skills vs. scripts vs. tools, Skills API, and safety boundaries.