Project Memory in ChatGPT: default vs. project-only and what enters context in 2026
Understand how ChatGPT Project memory modes affect instructions, files, chats, and outside context, including plan differences and tests for isolation.
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Context windows, tokens, memory, files, long conversations and ways to provide information to AI.
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Prompt caching in practice: how to separate static and variable context without breaking the cache
Prompt caching reduces cost and latency when calls reuse the same prefix. See how to separate static and variable content and measure cache hits without relying on guesswork.
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RAG or long context: when to send all documents, when to use retrieval, and when to combine the two
A practical matrix to choose between long context, RAG and hybrid architecture considering corpus, update, question type, citations, cost, latency and maintenance.
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Why does AI forget instructions in long conversations? Context window, context rot and clutter-free memory
When an AI starts to ignore old rules, the problem may be context limits, degradation within the window itself, conflicting instructions or misunderstood memory.
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