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Context window guides for ChatGPT, Claude and Gemini
Plain-English guides to AI context windows and token limits. Every page is dated, linked to its sources, and says where the numbers disagree.
ChatGPT context windowSize and limits by plan, and what to do when a chat fills up.Claude context windowWhat Anthropic says about the window, and what to do when it is full.Gemini context windowFree, Plus, Pro and Ultra windows, and how Gemini compares.Context window sizes by planChatGPT vs Claude vs Gemini in one table, with sources.How to check your context windowThree ways to see how full your chat is.'Conversation too long' fixWhy it happens and how to continue without losing work.What is context rot?Why long chats get worse, and how to avoid it.When to start a new chatSix signs and a 50 to 70 percent rule.Chat handoff promptCopy-and-paste prompt to move to a fresh chat.Free token counterEstimate tokens and window share for any text.Token counter extensions comparedA neutral comparison of the options.How ContextMeter worksA screenshot tour of the extension.