The Grounding with Google Search feature in the Gemini API and AI Studio can be used to improve the accuracy and recency of responses from the model. In addition to more factual responses, when Grounding with Google Search is enabled, the Gemini API returns grounding sources (in-line supporting links) and Google Search Suggestions along with the response content. The Search Suggestions point users to the search results corresponding to the grounded response.
Grounding with Google Search only supports text prompts. It doesn't support multimodal (text-and-image, text-and-audio, etc.) prompts. Grounding with Google Search supports all of the available languages for Gemini models.
This guide will help you get started with Grounding with Google Search using one of the Gemini API SDKs or the REST API.
Configure a model to use Google Search
Why is Grounding with Google Search useful?
In generative AI, grounding refers to the process of connecting the model to verifiable sources of information. These sources might provide real-world workplace information or other specific context. Grounding helps with improving the accuracy, reliability, and usefulness of AI outputs.
Grounding is particularly important for prompts that require up-to-date information from the web. Using grounding, the model can access information beyond its knowledge cutoff date, get sources for the information, and answer questions that it couldn't have answered accurately otherwise.
Using Google AI Studio or the Gemini API, you can ground model output to Google Search. Grounding with Google Search provides the following benefits:
- Allows model responses that are tethered to specific content.
- Reduces model hallucinations, which are instances where the model generates content that isn't factual.
- Anchors model responses to sources a user can click through and open.
- Enhances the trustworthiness and applicability of the generated content.
When you use Grounding with Google Search, you're effectively connecting the model to reliable Search results from the internet. Since non-grounded model responses are based on learned patterns, you might not get factual responses to prompts about current events (for example, asking for a weather forecast or the final score of a recent football game). Since the internet provides access to new information, a grounded prompt can generate more up-to-date responses, with sources cited.
Here's an example comparing a non-grounded response and a grounded response generated using the API. (The responses were generated in October 2024.)
| Ungrounded Gemini | Grounding with Google Search |
|---|---|
| Prompt: Who won the Super Bowl this year? Response: The Kansas City Chiefs won Super Bowl LVII this year (2023). |
Prompt: Who won the Super Bowl this year? Response: The Kansas City Chiefs won Super Bowl LVIII this year, defeating the San Francisco 49ers in overtime with a score of 25 to 22. |
In the ungrounded response, the model refers to the Kansas City Chiefs' 2023 Super Bowl win. In the grounded response, the model correctly references their more recent 2024 win.
The following image shows how a grounded response looks in AI Studio.
Google Search Suggestions
To use Grounding with Google Search, you have to display Google Search Suggestions, which are suggested queries included in the metadata of the grounded response. To learn more about the display requirements, see Use Google Search Suggestions.
Dynamic retrieval
Some queries are likely to benefit more from Grounding with Google Search than others. The dynamic retrieval feature gives you additional control over when to use Grounding with Google Search.
If the dynamic retrieval mode is unspecified, Grounding with Google Search is always triggered. If the mode is set to dynamic, the model decides when to use grounding based on a threshold that you can configure. The threshold is a floating-point value in the range [0,1] and defaults to 0.3. If the threshold value is 0, the response is always grounded with Google Search; if it's 1, it never is.
How dynamic retrieval works
You can use dynamic retrieval in your request to choose when to turn on Grounding with Google Search. This is useful when the prompt doesn't require an answer grounded in Google Search and the model can provide an answer based on its own knowledge without grounding. This helps you manage latency, quality, and cost more effectively.
Before you invoke the dynamic retrieval configuration in your request, understand the following terminology:
Prediction score: When you request a grounded answer, Gemini assigns a prediction score to the prompt. The prediction score is a floating point value in the range [0,1]. Its value depends on whether the prompt can benefit from grounding the answer with the most up-to-date information from Google Search. Thus, if a prompt requires an answer grounded in the most recent facts on the web, it has a higher prediction score. A prompt for which a model-generated answer is sufficient has a lower prediction score.
Here are examples of some prompts and their prediction scores.
Prompt Prediction score Comment "Write a poem about peonies" 0.13 The model can rely on its knowledge and the answer doesn't need grounding. "Suggest a toy for a 2yo child" 0.36 The model can rely on its knowledge and the answer doesn't need grounding. "Can you give a recipe for an asian-inspired guacamole?" 0.55 Google Search can give a grounded answer, but grounding isn't strictly required; the model knowledge might be sufficient. "What's Agent Builder? How is grounding billed in Agent Builder?" 0.72 Requires Google Search to generate a well-grounded answer. "Who won the latest F1 grand prix?" 0.97 Requires Google Search to generate a well-grounded answer. Threshold: In your API request, you can specify a dynamic retrieval configuration with a threshold. The threshold is a floating point value in the range [0,1] and defaults to 0.3. If the threshold value is zero, the response is always grounded with Google Search. For all other values of threshold, the following is applicable:
- If the prediction score is greater than or equal to the threshold, the answer is grounded with Google Search. A lower threshold implies that more prompts have responses that are generated using Grounding with Google Search.
- If the prediction score is less than the threshold, the model might still generate the answer, but it isn't grounded with Google Search.
To learn how to set the dynamic retrieval threshold using an SDK or the REST API, see the appropriate code example.
If you're using AI Studio, you can set the dynamic retrieval threshold by clicking Edit grounding.
To find a good threshold that suits your business needs, you can create a representative set of queries that you expect to encounter. Then you can sort the queries according to the prediction score in the response and select a good threshold for your use case.
A grounded response
If your prompt successfully grounds to Google Search, the response will include
groundingMetadata. A grounded response might look something like this
(parts of the response have been omitted for brevity):
{
"candidates": [
{
"content": {
"parts": [
{
"text": "Carlos Alcaraz won the Gentlemen's Singles title at the 2024 Wimbledon Championships. He defeated Novak Djokovic in the final, winning his second consecutive Wimbledon title and fourth Grand Slam title overall. \n"
}
],
"role": "model"
},
...
"groundingMetadata": {
"searchEntryPoint": {
"renderedContent": "\u003cstyle\u003e\n.container {\n align-items: center;\n border-radius: 8px;\n display: flex;\n font-family: Google Sans, Roboto, sans-serif;\n font-size: 14px;\n line-height: 20px;\n padding: 8px 12px;\n}\n.chip {\n display: inline-block;\n border: solid 1px;\n border-radius: 16px;\n min-width: 14px;\n padding: 5px 16px;\n text-align: center;\n user-select: none;\n margin: 0 8px;\n -webkit-tap-highlight-color: transparent;\n}\n.carousel {\n overflow: auto;\n scrollbar-width: none;\n white-space: nowrap;\n margin-right: -12px;\n}\n.headline {\n display: flex;\n margin-right: 4px;\n}\n.gradient-container {\n position: relative;\n}\n.gradient {\n position: absolute;\n transform: translate(3px, -9px);\n height: 36px;\n width: 9px;\n}\n@media (prefers-color-scheme: light) {\n .container {\n background-color: #fafafa;\n box-shadow: 0 0 0 1px #0000000f;\n }\n .headline-label {\n color: #1f1f1f;\n }\n .chip {\n background-color: #ffffff;\n border-color: #d2d2d2;\n color: #5e5e5e;\n text-decoration: none;\n }\n .chip:hover {\n background-color: #f2f2f2;\n }\n .chip:focus {\n background-color: #f2f2f2;\n }\n .chip:active {\n background-color: #d8d8d8;\n border-color: #b6b6b6;\n }\n .logo-dark {\n display: none;\n }\n .gradient {\n background: linear-gradient(90deg, #fafafa 15%, #fafafa00 100%);\n }\n}\n@media (prefers-color-scheme: dark) {\n .container {\n background-color: #1f1f1f;\n box-shadow: 0 0 0 1px #ffffff26;\n }\n .headline-label {\n color: #fff;\n }\n .chip {\n background-color: #2c2c2c;\n border-color: #3c4043;\n color: #fff;\n text-decoration: none;\n }\n .chip:hover {\n background-color: #353536;\n }\n .chip:focus {\n background-color: #353536;\n }\n .chip:active {\n background-color: #464849;\n border-color: #53575b;\n }\n .logo-light {\n display: none;\n }\n .gradient {\n background: linear-gradient(90deg, #1f1f1f 15%, #1f1f1f00 100%);\n }\n}\n\u003c/style\u003e\n\u003cdiv class=\"container\"\u003e\n \u003cdiv class=\"headline\"\u003e\n \u003csvg class=\"logo-light\" width=\"18\" height=\"18\" viewBox=\"9 9 35 35\" fill=\"none\" xmlns=\"http://www.w3.org/2000/svg\"\u003e\n \u003cpath fill-rule=\"evenodd\" clip-rule=\"evenodd\" d=\"M42.8622 27.0064C42.8622 25.7839 42.7525 24.6084 42.5487 23.4799H26.3109V30.1568H35.5897C35.1821 32.3041 33.9596 34.1222 32.1258 35.3448V39.6864H37.7213C40.9814 36.677 42.8622 32.2571 42.8622 27.0064V27.0064Z\" fill=\"#4285F4\"/\u003e\n \u003cpath fill-rule=\"evenodd\" clip-rule=\"evenodd\" d=\"M26.3109 43.8555C30.9659 43.8555 34.8687 42.3195 37.7213 39.6863L32.1258 35.3447C30.5898 36.3792 28.6306 37.0061 26.3109 37.0061C21.8282 37.0061 18.0195 33.9811 16.6559 29.906H10.9194V34.3573C13.7563 39.9841 19.5712 43.8555 26.3109 43.8555V43.8555Z\" fill=\"#34A853\"/\u003e\n \u003cpath fill-rule=\"evenodd\" clip-rule=\"evenodd\" d=\"M16.6559 29.8904C16.3111 28.8559 16.1074 27.7588 16.1074 26.6146C16.1074 25.4704 16.3111 24.3733 16.6559 23.3388V18.8875H10.9194C9.74388 21.2072 9.06992 23.8247 9.06992 26.6146C9.06992 29.4045 9.74388 32.022 10.9194 34.3417L15.3864 30.8621L16.6559 29.8904V29.8904Z\" fill=\"#FBBC05\"/\u003e\n \u003cpath fill-rule=\"evenodd\" clip-rule=\"evenodd\" d=\"M26.3109 16.2386C28.85 16.2386 31.107 17.1164 32.9095 18.8091L37.8466 13.8719C34.853 11.082 30.9659 9.3736 26.3109 9.3736C19.5712 9.3736 13.7563 13.245 10.9194 18.8875L16.6559 23.3388C18.0195 19.2636 21.8282 16.2386 26.3109 16.2386V16.2386Z\" fill=\"#EA4335\"/\u003e\n \u003c/svg\u003e\n \u003csvg class=\"logo-dark\" width=\"18\" height=\"18\" viewBox=\"0 0 48 48\" xmlns=\"http://www.w3.org/2000/svg\"\u003e\n \u003ccircle cx=\"24\" cy=\"23\" fill=\"#FFF\" r=\"22\"/\u003e\n \u003cpath d=\"M33.76 34.26c2.75-2.56 4.49-6.37 4.49-11.26 0-.89-.08-1.84-.29-3H24.01v5.99h8.03c-.4 2.02-1.5 3.56-3.07 4.56v.75l3.91 2.97h.88z\" fill=\"#4285F4\"/\u003e\n \u003cpath d=\"M15.58 25.77A8.845 8.845 0 0 0 24 31.86c1.92 0 3.62-.46 4.97-1.31l4.79 3.71C31.14 36.7 27.65 38 24 38c-5.93 0-11.01-3.4-13.45-8.36l.17-1.01 4.06-2.85h.8z\" fill=\"#34A853\"/\u003e\n \u003cpath d=\"M15.59 20.21a8.864 8.864 0 0 0 0 5.58l-5.03 3.86c-.98-2-1.53-4.25-1.53-6.64 0-2.39.55-4.64 1.53-6.64l1-.22 3.81 2.98.22 1.08z\" fill=\"#FBBC05\"/\u003e\n \u003cpath d=\"M24 14.14c2.11 0 4.02.75 5.52 1.98l4.36-4.36C31.22 9.43 27.81 8 24 8c-5.93 0-11.01 3.4-13.45 8.36l5.03 3.85A8.86 8.86 0 0 1 24 14.14z\" fill=\"#EA4335\"/\u003e\n \u003c/svg\u003e\n \u003cdiv class=\"gradient-container\"\u003e\u003cdiv class=\"gradient\"\u003e\u003c/div\u003e\u003c/div\u003e\n \u003c/div\u003e\n \u003cdiv class=\"carousel\"\u003e\n \u003ca class=\"chip\" href=\"https://vertexaisearch.cloud.google.com/grounding-api-redirect/AWhgh4x8Epe-gzpwRBvp7o3RZh2m1ygq1EHktn0OWCtvTXjad4bb1zSuqfJd6OEuZZ9_SXZ_P2SvCpJM7NaFfQfiZs6064MeqXego0vSbV9LlAZoxTdbxWK1hFeqTG6kA13YJf7Fbu1SqBYM0cFM4zo0G_sD9NKYWcOCQMvDLDEJFhjrC9DM_QobBIAMq-gWN95G5tvt6_z6EuPN8QY=\"\u003ewho won wimbledon 2024\u003c/a\u003e\n \u003c/div\u003e\n\u003c/div\u003e\n"
},
"groundingChunks": [
{
"web": {
"uri": "https://vertexaisearch.cloud.google.com/grounding-api-redirect/AWhgh4whET1ta3sDETZvcicd8FeNe4z0VuduVsxrT677KQRp2rYghXI0VpfYbIMVI3THcTuMwggRCbFXS_wVvW0UmGzMe9h2fyrkvsnQPJyikJasNIbjJLPX0StM4Bd694-ZVle56MmRA4YiUvwSqad1w6O2opmWnw==",
"title": "wikipedia.org"
}
},
{
"web": {
"uri": "https://vertexaisearch.cloud.google.com/grounding-api-redirect/AWhgh4wR1M-9-yMPUr_KdHlnoAmQ8ZX90DtQ_vDYTjtP2oR5RH4tRP04uqKPLmesvo64BBkPeYLC2EpVDxv9ngO3S1fs2xh-e78fY4m0GAtgNlahUkm_tBm_sih5kFPc7ill9u2uwesNGUkwrQlmP2mfWNU5lMMr23HGktr6t0sV0QYlzQq7odVoBxYWlQ_sqWFH",
"title": "wikipedia.org"
}
},
{
"web": {
"uri": "https://vertexaisearch.cloud.google.com/grounding-api-redirect/AWhgh4wsDmROzbP-tmt8GdwCW_pqISTZ4IRbBuoaMyaHfcQg8WW-yKRQQvMDTPAuLxJh-8_U8_iw_6JKFbQ8M9oVYtaFdWFK4gOtL4RrC9Jyqc5BNpuxp6uLEKgL5-9TggtNvO97PyCfziDFXPsxylwI1HcfQdrz3Jy7ZdOL4XM-S5rC0lF2S3VWW0IEAEtS7WX861meBYVjIuuF_mIr3spYPqWLhbAY2Spj-4_ba8DjRvmevIFUhRuESTKvBfmpxNSM",
"title": "cbssports.com"
}
},
{
"web": {
"uri": "https://vertexaisearch.cloud.google.com/grounding-api-redirect/AWhgh4yzjLkorHiUKjhOPkWaZ9b4cO-cLG-02vlEl6xTBjMUjyhK04qSIclAa7heR41JQ6AAVXmNdS3WDrLOV4Wli-iezyzW8QPQ4vgnmO_egdsuxhcGk3-Fp8-yfqNLvgXFwY5mPo6QRhvplOFv0_x9mAcka18QuAXtj0SPvJfZhUEgYLCtCrucDS5XFc5HmRBcG1tqFdKSE1ihnp8KLdaWMhrUQI21hHS9",
"title": "jagranjosh.com"
}
},
{
"web": {
"uri": "https://vertexaisearch.cloud.google.com/grounding-api-redirect/AWhgh4y9L4oeNGWCatFz63b9PpP3ys-Wi_zwnkUT5ji9lY7gPUJQcsmmE87q88GSdZqzcx5nZG9usot5FYk2yK-FAGvCRE6JsUQJB_W11_kJU2HVV1BTPiZ4SAgm8XDFIxpCZXnXmEx5HUfRqQm_zav7CvS2qjA2x3__qLME6Jy7R5oza1C5_aqjQu422le9CaigThS5bvJoMo-ZGcXdBUCj2CqoXNVjMA==",
"title": "apnews.com"
}
}
],
"groundingSupports": [
{
"segment": {
"endIndex": 85,
"text": "Carlos Alcaraz won the Gentlemen's Singles title at the 2024 Wimbledon Championships."
},
"groundingChunkIndices": [
0,
1,
2,
3
],
"confidenceScores": [
0.97380733,
0.97380733,
0.97380733,
0.97380733
]
},
{
"segment": {
"startIndex": 86,
"endIndex": 210,
"text": "He defeated Novak Djokovic in the final, winning his second consecutive Wimbledon title and fourth Grand Slam title overall."
},
"groundingChunkIndices": [
1,
0,
4
],
"confidenceScores": [
0.96145374,
0.96145374,
0.96145374
]
}
],
"webSearchQueries": [
"who won wimbledon 2024"
]
}
}
],
...
}
If the response doesn't include groundingMetadata, this means the response
wasn't successfully grounded. There are several reasons this could happen,
including low source relevance or incomplete information within the
model response.
When a grounded result is generated, the metadata contains URIs that redirect
to the publishers of the content that was used to generate the grounded result.
These URIs contain the vertexaisearch subdomain, as in this truncated example:
https://vertexaisearch.cloud.google.com/grounding-api-redirect/.... The
metadata also contains the publishers' domains. The provided URIs remain
accessible for 30 days after the grounded result is generated.
The renderedContent field within searchEntryPoint is the provided code for
implementing Google Search Suggestions. See
Use Google Search Suggestions
to learn more.