Exa’s Search API returns a list of webpages and their contents based on a natural language search query. Results are optimized for LLM consumption, enabling higher-quality completions with clean, token efficient data.
Recommended: Try our Coding Agent Quickstart — get a working search call in under a minute, then come back here for the full reference.
Key Benefits
- Token efficient: Use
highlights to get key excerpts relevant to your query, reducing token usage by 10x compared to full text, without adding latency.
- Specialized index coverage: State of the art search performance on people, company, and code using Exa’s in-house search indexes.
- Incredible speed: From
auto for highest quality to fast for sub-second latency to instant for sub-200ms latency, Exa provides the fastest search available without compromising on quality—enabling real-time workflows like autocomplete and live suggestions.
Request Fields
The query parameter is required for all search requests. The remaining fields are optional. See the API Reference for complete parameter details.
| Field | Type | Notes | Example |
|---|
| query | string | The search query. Supports long, semantically rich descriptions for finding niche content. | ”blog post about embeddings and vector search” |
| type | string | Search method: auto (highest quality), fast (low latency), instant (lowest latency), deep (deep web research with structured outputs). | “auto” |
| systemPrompt | string | Deep-search-only instructions that guide both search planning and the final synthesized result. | ”Prefer official sources and avoid duplicate results” |
| numResults | int | Number of results to return (1-100). Defaults to 10. | 10 |
| highlights | bool/obj | Return token-efficient excerpts most relevant to your query. You can also request full text if needed—see the API Reference. | { "maxCharacters": 4000 } |
| maxAgeHours | int | Maximum age of indexed content in hours. If older, fetches with livecrawl. 0 = always livecrawl, -1 = never livecrawl (cache only). | 24 |
| category | string | Target specific content types: company, people, tweet, news | ”company” |
Search Types
The type parameter selects the search method:
-
auto (default): Exa’s highest quality search. Intelligently combines neural and other search methods.
-
fast: Low latency search using optimized versions of the search models. A good middle ground when you need speed without sacrificing too much quality.
-
instant: Lowest latency search optimized for real-time applications like autocomplete or live suggestions.
-
deep: Deep web research with structured outputs. Best for complicated queries that require multi steps of search, reasoning, and structured json outputs.
Token Efficiency
Choosing the right content mode can significantly reduce token usage while maintaining answer quality.
| Mode | Best For |
|---|
| text | Deep analysis, when you need full context, comprehensive research |
| highlights | Factual questions, specific lookups, multi-step agent workflows |
| summary | Quick overviews, structured extraction, when you control the output size |
{
"query": "What is the current Fed interest rate?",
"contents": {
"highlights": { "maxCharacters": 4000 }
},
// Real-time info requires livecrawl; this may increase latency
"maxAgeHours": 0
}
maxCharacters to cap token usage.
{
"query": "detailed analysis of transformer architecture innovations",
"contents": {
"text": { "maxCharacters": 15000 }
},
"numResults": 5
}
Content Freshness
Control whether results come from Exa’s index or are freshly crawled using maxAgeHours:
maxAgeHours: 24: Use cache if less than 24 hours old, otherwise livecrawl. Good for daily-fresh content.maxAgeHours: 1: Use cache if less than 1 hour old. Good for near real-time data.maxAgeHours: 0: Always livecrawl (ignore cache). Use when cached data is unacceptable.maxAgeHours: -1: Never livecrawl (cache only). Maximum speed, historical/static content.- Omit (recommended): Default behavior — livecrawl as fallback if no cache exists.
{
"query": "latest announcements from OpenAI",
"includeDomains": ["openai.com"],
"maxAgeHours": 72,
"contents": {
"highlights": {
"maxCharacters": 4000
}
}
}
Deep Output Schema
For deep search variants (deep, deep-reasoning), you can pass outputSchema (or output_schema in Python SDK) to control output.content format.
type: "text": return plain text output (optionally guided with a description)type: "object": return structured JSON output
Do not include citation or confidence fields in outputSchema/output_schema. Deep search already returns grounding and citations automatically in output.grounding.
- Redundant: duplicates data that is already returned, increasing tokens and latency.
- Less reliable: model-generated citation fields inside
output.content are generally less reliable than built-in grounding.
Simpler schemas perform better. Defining clear primitive/object/array fields works best, while string properties that try to embed JSON blobs usually perform poorly.
{
"query": "what's the fastest web search api",
"type": "deep",
"outputSchema": {
"type": "text",
"description": "Short one to two sentence answer"
}
}
{
"query": "top aerospace companies",
"type": "deep",
"outputSchema": {
"type": "object",
"required": ["companies"],
"properties": {
"companies": {
"type": "array",
"description": "A list of aerospace companies",
"items": {
"type": "object",
"required": ["company_name", "ceo_name", "stock_price"],
"properties": {
"company_name": {
"type": "string",
"description": "The name of the aerospace company"
},
"ceo_name": {
"type": "string",
"description": "The name of the company's CEO"
},
"stock_price": {
"type": "number",
"description": "Current stock price of the company"
}
}
}
}
}
}
}
- Maximum nesting depth:
2
- Maximum total properties:
10
Deep System Prompt
For deep search variants (deep, deep-reasoning, deep-max), you can also pass systemPrompt (or system_prompt in Python SDK) to guide both how the agent searches and how it synthesizes the final returned result.
Use this for instructions like:
- prefer official or primary sources
- emphasize novelty or avoid duplicate findings
- keep the answer concise or highly structured
Use outputSchema/output_schema for shape, and systemPrompt/system_prompt for behavior.
{
"query": "compare the latest frontier AI model releases",
"type": "deep-reasoning",
"systemPrompt": "Prefer official sources and avoid duplicate results",
"outputSchema": {
"type": "object",
"required": ["models"],
"properties": {
"models": {
"type": "array",
"items": {
"type": "object",
"required": ["name", "notable_claims"],
"properties": {
"name": { "type": "string" },
"notable_claims": { "type": "array", "items": { "type": "string" } }
}
}
}
}
}
}
Category Filters
Use category to target specific content types where Exa has specialized coverage:
| Category | Best For |
|---|
company | Company pages, LinkedIn company profiles |
people | Multi-source data on people, LinkedIn profiles |
research paper | Academic papers, arXiv, peer-reviewed research |
news | Current events, journalism |
tweet | Posts from X/Twitter |
personal site | Blogs, personal pages (Exa’s unique strength) |
financial report | SEC filings, earnings reports |
{
"query": "agtech companies in the US that have raised series A",
"type": "auto",
"category": "company",
"numResults": 10,
"contents": {
"highlights": {
"maxCharacters": 4000
}
}
}
