Linkup Flash - Linkup API Documentation

We’re releasing Linkup Flash, a new depth value for the Search endpoint. "flash" is our lowest-latency search mode: ranked sources and snippets in under 200 ms.

What’s new

"flash" uses a more direct search pipeline than "fast", "standard", or "deep":

"flash": lowest latency. One piece of information, one direct answer. No query reinterpretation, no scraping.
"fast": higher-quality one-shot retrieval in about a second. Still no agentic planning.
"standard": single-iteration agentic search for queries that span several topics or sources.
"deep": multi-iteration agentic search-and-scrape.

How to use

Set depth to "flash" in your API request:

curl --request POST \
  --url https://api.linkup.so/v1/search \
  --header 'Authorization: Bearer {{LINKUP_API_KEY}}' \
  --header 'Content-Type: application/json' \
  --data '{
  "q": "What changed in the latest EU AI Act guidance?",
  "depth": "flash",
  "outputType": "searchResults"
}'

from linkup import LinkupClient

client = LinkupClient(api_key="{{LINKUP_API_KEY}}")

response = client.search(
    query="What changed in the latest EU AI Act guidance?",
    depth="flash",
    output_type="searchResults",
)
print(response)

import { LinkupClient } from 'linkup-sdk';

const client = new LinkupClient({
  apiKey: '{{LINKUP_API_KEY}}',
});

const response = await client.search({
  query: "What changed in the latest EU AI Act guidance?",
  depth: "flash",
  outputType: "searchResults",
});
console.log(response);

"flash" and "fast" pass the query to the index as-is. Keep prompts short and keyword-shaped. For instruction-style prompts (scrape this URL, then search again), use "standard" or "deep".

When to use each depth

Depth	Best for	Latency
`"flash"`	Simple, focused queries: one piece of information, lowest latency	<200 ms
`"fast"`	Higher-quality one-shot lookups when ~1s is acceptable	~1s
`"standard"`	Instruction-style retrieval, several topics or one provided URL	1–3s
`"deep"`	Sequential search-then-scrape chains	5–30s

Pricing

"flash" costs $0.005 per call with outputType: "searchResults", the same as "fast" and "standard". "sourcedAnswer" and "structured" are $0.006 per call. For more details, see Search overview.