Claude Tag
Claude Tag is a feature that allows users to tag and organize conversations with Claude for easier retrieval and management.
Background
Claude Tag is Anthropic's solution for prompt caching — a feature that allows developers to mark reusable portions of a conversation (like system instructions, long reference documents, or few-shot examples) with a tag so the API can reuse previously computed outputs instead of reprocessing the same text from scratch. This cuts latency and token costs significantly for repetitive or lengthy prompts. Prompt caching is already available in several major LLM APIs (OpenAI, Google, Mistral) and is becoming standard infrastructure for production AI applications, especially those that need fast, consistent responses without repeatedly paying full price for static context.