Answers — AI Grounding

Requires API Key: Get one at https://api.search.brave.com

Plan: Included in the Answers plan. See https://api-dashboard.search.brave.com/app/subscriptions/subscribe

When to Use

| Use Case | Skill | Why | |--|--|--| | Quick factual answer (raw context) | llm-context | Single search, returns raw context for YOUR LLM | | Fast AI answer with citations | answers (single-search) | streaming, citations | | Thorough multi-search deep research | answers (research mode) | Iterative deep research, synthesized cited answer |

This endpoint (/res/v1/chat/completions) supports two modes:

• Single-search (default): Fast AI-grounded answer from a single search. Supports enable_citations.
• Research (enable_research=true): Multi-iteration deep research with progress events and synthesized cited answer.

Quick Start (cURL)

Blocking (Single-Search)

curl -X POST "https://api.search.brave.com/res/v1/chat/completions" \
  -H "Content-Type: application/json" \
  -H "X-Subscription-Token: ${BRAVE_SEARCH_API_KEY}" \
  -d '{
    "messages": [{"role": "user", "content": "How does the James Webb Space Telescope work?"}],
    "model": "brave",
    "stream": false
  }'

Streaming with Citations (Single-Search)

curl -X POST "https://api.search.brave.com/res/v1/chat/completions" \
  -H "Content-Type: application/json" \
  -H "X-Subscription-Token: ${BRAVE_SEARCH_API_KEY}" \
  -d '{
    "messages": [{"role": "user", "content": "What are recent breakthroughs in fusion energy?"}],
    "model": "brave",
    "stream": true,
    "enable_citations": true
  }'

Research Mode

curl -X POST "https://api.search.brave.com/res/v1/chat/completions" \
  -H "Content-Type: application/json" \
  -H "X-Subscription-Token: ${BRAVE_SEARCH_API_KEY}" \
  -d '{
    "messages": [{"role": "user", "content": "Compare quantum computing approaches"}],
    "model": "brave",
    "stream": true,
    "enable_research": true,
    "research_maximum_number_of_iterations": 3,
    "research_maximum_number_of_seconds": 120
  }'

Endpoint

POST https://api.search.brave.com/res/v1/chat/completions

Authentication: X-Subscription-Token: <API_KEY> header (or Authorization: Bearer <API_KEY>)

SDK Compatible: Works with OpenAI SDK via base_url="https://api.search.brave.com/res/v1"

Two Modes

| Feature | Single-Search (default) | Research (enable_research=true) | |--|--|--| | Speed | Fast | Slow | | Searches | 1 | Multiple (iterative) | | Streaming | Optional (stream=true/false) | Required (stream=true) | | Citations | enable_citations=true (streaming only) | Built-in (in <answer> tag) | | Progress events | No | Yes (<progress> tags) | | Blocking response | Yes (stream=false) | No |

Parameters

Standard Parameters

| Parameter | Type | Required | Default | Description | |--|--|--|--|--| | messages | array | Yes | - | Single user message (exactly 1 message) | | model | string | Yes | - | Use "brave" | | stream | bool | No | true | Enable SSE streaming | | country | string | No | "US" | Search country (2-letter country code or ALL) | | language | string | No | "en" | Response language | | safesearch | string | No | "moderate" | Search safety level (off, moderate, strict) | | max_completion_tokens | int | No | null | Upper bound on completion tokens | | enable_citations | bool | No | false | Include inline citation tags (single-search streaming only) | | web_search_options | object | No | null | OpenAI-compatible; search_context_size: low, medium, high |

Research Parameters

| Parameter | Type | Required | Default | Description | |--|--|--|--|--| | enable_research | bool | No | false | Enable research mode | | research_allow_thinking | bool | No | true | Enable extended thinking | | research_maximum_number_of_tokens_per_query | int | No | 8192 | Max tokens per query (1024-16384) | | research_maximum_number_of_queries | int | No | 20 | Max total search queries (1-50) | | research_maximum_number_of_iterations | int | No | 4 | Max research iterations (1-5) | | research_maximum_number_of_seconds | int | No | 180 | Time budget in seconds (1-300) | | research_maximum_number_of_results_per_query | int | No | 60 | Results per search query (1-60) |

Constraints (IMPORTANT)

| Constraint | Error | |--|--| | enable_research=true requires stream=true | "Blocking response doesn't support 'enable_research' option" | | enable_research=true incompatible with enable_citations=true | "Research mode doesn't support 'enable_citations' option" | | enable_citations=true requires stream=true | "Blocking response doesn't support 'enable_citations' option" |

OpenAI SDK Usage

Blocking (Single-Search)

from openai import OpenAI

client = OpenAI(
    base_url="https://api.search.brave.com/res/v1",
    api_key="your-brave-api-key",
)

response = client.chat.completions.create(
    model="brave",
    messages=[{"role": "user", "content": "How does the James Webb Space Telescope work?"}],
    stream=False,
)
print(response.choices[0].message.content)

Streaming with Citations (Single-Search)

from openai import OpenAI

client = OpenAI(
    base_url="https://api.search.brave.com/res/v1",
    api_key="your-brave-api-key",
)

stream = client.chat.completions.create(
    model="brave",
    messages=[{"role": "user", "content": "What are the current trends in renewable energy?"}],
    stream=True,
    extra_body={"enable_citations": True}
)

for chunk in stream:
    if chunk.choices[0].delta.content:
        print(chunk.choices[0].delta.content, end="")

Research Mode

from openai import AsyncOpenAI

client = AsyncOpenAI(
    base_url="https://api.search.brave.com/res/v1",
    api_key="your-brave-api-key",
)

stream = await client.chat.completions.create(
    model="brave",
    messages=[{"role": "user", "content": "Compare quantum computing approaches"}],
    stream=True,
    extra_body={
        "enable_research": True,
        "research_maximum_number_of_iterations": 3,
        "research_maximum_number_of_seconds": 120
    }
)

async for chunk in stream:
    if chunk.choices[0].delta.content:
        print(chunk.choices[0].delta.content, end="", flush=True)

Response Format

Blocking Response (stream=false, single-search only)

Standard OpenAI-compatible JSON:

{
  "id": "chatcmpl-...",
  "object": "chat.completion",
  "choices": [{"message": {"role": "assistant", "content": "The James Webb Space Telescope works by..."}, "index": 0, "finish_reason": "stop"}],
  "usage": {"prompt_tokens": 10, "completion_tokens": 50, "total_tokens": 60}
}

Streaming Response

SSE response with OpenAI-compatible chunks:

data: {"id":"chatcmpl-...","object":"chat.completion.chunk","choices":[{"delta":{"content":"Based on"},"index":0}]}

data: {"id":"chatcmpl-...","object":"chat.completion.chunk","choices":[{"delta":{"content":" recent research"},"index":0}]}

data: [DONE]

Streaming Tags by Mode

Single-Search (with enable_citations=true)

| Tag | Purpose | |--|--| | <citation> | Inline citation references | | <usage> | JSON cost/billing data |

Research Mode

| Tag | Purpose | Keep? | |--|--|--| | <queries> | Generated search queries | Debug | | <analyzing> | URL counts (verbose) | Debug | | <thinking> | URL selection reasoning | Debug | | <progress> | Stats: time, iterations, queries, URLs analyzed, tokens | Monitor | | <blindspots> | Knowledge gaps identified | Yes | | <answer> | Final synthesized answer (only the final answer is emitted; intermediate drafts are dropped) | Yes | | <usage> | JSON cost/billing data (included at end of streaming response) | Yes |

Usage Tag Format

The <usage> tag contains JSON-stringified cost and token data:

<usage>{"X-Request-Requests":1,"X-Request-Queries":8,"X-Request-Tokens-In":15000,"X-Request-Tokens-Out":2000,"X-Request-Requests-Cost":0.005,"X-Request-Queries-Cost":0.032,"X-Request-Tokens-In-Cost":0.075,"X-Request-Tokens-Out-Cost":0.01,"X-Request-Total-Cost":0.122}</usage>

Use Cases

• Chat interface integration: Drop-in OpenAI SDK replacement with web-grounded answers. Set base_url="https://api.search.brave.com/res/v1".
• Deep research / comprehensive topic research: Use research mode (enable_research=true) for complex questions needing multi-source synthesis (e.g., "Compare approaches to nuclear fusion").
• OpenAI SDK drop-in: Same SDK, same streaming format — just change base_url and api_key. Works with both sync and async clients.
• Cited answers: Enable enable_citations=true in single-search mode for inline citation tags, or use research mode which automatically includes citations in its answer.

Notes

• Timeout: Set client timeout to at least 30s for single-search, 300s (5 min) for research
• Single message: The messages array must contain exactly 1 user message
• Cost monitoring: Parse the <usage> tag from streaming responses to track costs