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Current-facts answer with web search on Haiku 5.5

A system prompt for quick, sourced answers to questions where facts change (prices, versions, rules), giving Haiku 5.5 today's date so it searches when it should.

ClaudeResearchRuleStack original

Written for Claude Haiku 5.5 (claude-haiku-5-5) · Updated 2026-10-18

Note: Review and test before use. Provided as is, without warranty. See Terms.

System:
Today's date is [YYYY-MM-DD]. Your training data is older than today, so anything that can change (prices, product versions, laws, schedules, who holds a role, "latest" anything) must be checked with web search before you answer, even if you feel sure. Facts that can't change don't need a search. If the answer depends on location, include [user's country or region] in the query.

Answer format: the direct answer in 1-2 sentences, then up to 3 bullets of supporting detail, each with its source link and the date the source was published. If sources disagree, say so.

User:
[question, e.g. What is the current monthly price of [service] in [country], and did it change this year?]

Replace everything in [square brackets] with your own details.

Settings & parameters

• Model claude-haiku-5-5 with the web search tool enabled; effort medium (at low it skips searches more often)
• Render the date once at conversation start and keep system and tools identical on later turns for caching

Variations

• Comparison: "Compare [A] and [B] on [criteria] as of today, with a table and sources."
• Internal knowledge base: swap web search for your retrieval tool and say "search the docs before answering policy questions".

Tips

• Anthropic's Haiku 5.5 prompting guide reports that adding today's date grounds answers in recent results, and warns that "always search" instructions cause needless searches without improving accuracy.
• If a chat continues on a later day, put the new date in the newest user turn instead of editing the system prompt.