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ChatGPT Projects retain chats, files, and instructions as project context, while broader memory availability depends on settings and workspace policy.

Claude can search and reuse context from previous conversations for paid-plan users where chat search and memory are available.

Perplexity stores project-scoped memories, while Computer also documents persistent context across sessions.

Codex can retain local memories of earlier chats for later sessions on ChatGPT Plus, Pro, Business, Enterprise, and API, but memories are off by default and region-limited.

Claude Code retains context across sessions with CLAUDE.md instructions and auto memory that saves preferences and corrections without the user writing them.

Cursor retains cross-session context through user-written Rules in Agent chat, and Cursor 1.0 announced per-project Memories that store conversation facts for later reference.

GitHub Copilot Memory retains repository facts and personal coding preferences across sessions on Pro and Pro Plus.

Devin Desktop exposes memories and rules for reusable project context; exact persistence depends on configuration.

Replit checkpoints preserve Agent conversation context, project state, environment configuration, and Agent memory.