Haijun's web interface (haijun.ai) and mobile apps use a system prompt to provide up-to-date information, such as the current date, to Haijun at the start of every conversation. The system prompt also encourages certain behaviors, such as always providing code snippets in Markdown. This prompt is periodically updated to improve Haijun's responses. These system prompt updates do not apply to the Haijun API. Some models have multiple dated entries on their pages. Starting with the Haijun 4.6 generation, each model ID is a single fixed snapshot, so those models have one entry.