# Help with Custom GPT ↔ Weaviate Cloud Integration (HTTP 400 Error)
**URL:** https://forum.weaviate.io/t/help-with-custom-gpt-weaviate-cloud-integration-http-400-error/21958
**Category:** Support
**Tags:** integration
**Created:** [September 10, 2025, 12:39pm UTC](https://forum.weaviate.io/t/help-with-custom-gpt-weaviate-cloud-integration-http-400-error/21958 "2025-09-10T12:39:43Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@Will78](https://forum.weaviate.io/u/Will78)
#### Post date: [September 10, 2025, 12:39pm UTC](https://forum.weaviate.io/t/help-with-custom-gpt-weaviate-cloud-integration-http-400-error/21958/1 "2025-09-10T12:39:43Z")
### Description
Hello everyone,
I am currently working on connecting my custom GPT to Weaviate Cloud in order to retrieve contextual content. However, I consistently encounter an HTTP 400 Bad Request error when calling my weaviate collection.
From what I understand, the issue seems related to the plugin request syntax. I have reviewed the available examples, but unfortunately, I am still unable to make it work.
If anyone could kindly share a working syntax example (or point me to relevant documentation), it would be greatly appreciated.
Thank you in advance for your support!
### Server Setup Information
- Weaviate Server Version:
- Deployment Method:
- Multi Node? Number of Running Nodes:
- Client Language and Version:
- Multitenancy?:
### Any additional Information
---
### Author:  [@DudaNogueira](https://forum.weaviate.io/u/DudaNogueira)
#### Post date: [September 10, 2025, 3:38pm UTC](https://forum.weaviate.io/t/help-with-custom-gpt-weaviate-cloud-integration-http-400-error/21958/2 "2025-09-10T15:38:25Z")
hi @Will78 !!
Welcome to our community 🤗
You can do that by providing a generative provider at query time and point it’s baseurl elsewhere you can answer the request with your custom GPT/Generative model
For example:
```python
from weaviate import classes as wvc
collection = client.collections.create(
"Test",
)
collection.data.insert({"title": "Something to test"})
collection.generate.bm25(
query="Some Test",
generative_provider=wvc.generate.GenerativeConfig.openai(
base_url="https://webhook.site/432cd01d-f8e1-418f-81d0-c172d19bc646"
),
grouped_task="Translate to Portuguese",
)
```
and this is the payload you will get sent to [https://webhook.site/432cd01d-f8e1-418f-81d0-c172d19bc646](https://webhook.site/432cd01d-f8e1-418f-81d0-c172d19bc646)
```json
{
"messages": [
{
"role": "user",
"content": "Translate to Portuguese: [{\"title\":\"Something to test\"}]"
}
],
"model": "gpt-5-mini",
"frequency_penalty": 0,
"max_completion_tokens": 127980,
"presence_penalty": 0,
"top_p": 1
}
```
Ps: Using here `generate.bm25` for the sake of simplicity, but it will work with all different search methods.
Let me know if this helps!
---
### Author:  [@Will78](https://forum.weaviate.io/u/Will78)
#### Post date: [September 15, 2025, 10:18am UTC](https://forum.weaviate.io/t/help-with-custom-gpt-weaviate-cloud-integration-http-400-error/21958/3 "2025-09-15T10:18:19Z")
Hello @DudaNogueira , my workflow is this one: OpenAi (CustomGPT)→ Weaviate Cloud, meaning that I am using the standard ChatGPT interface to query weaviate. I understand that, you provide me a way to do the opposite if I am right. Here is an example of an YAML code I have included without success into the actions of my ChatGpt plugin. Please note that the authentication seems to be ok as included into the plugin itself.
{
“openapi”: “3.1.0”,
“info”: {
“title”: “Get hr data”,
“description”: “Retrieves current hr data.”,
“version”: “v1.0.0”
},
“servers”: [
{
“url”: “[https://xxxxxxxxx.gcp.weaviate.cloud](https://xxxxxxxxx.gcp.weaviate.cloud)”
}
],
“paths”: {
“/v1/graphql”: {
“post”: {
“description”: “Retrieve eaviate content”,
“operationId”: “PolicyChunk”,
“parameters”: [
{
“name”: “chunk\_text”,
“in”: “query”,
“description”: “The policy”,
“required”: true,
“schema”: {
“type”: “string”
}
}
],
“deprecated”: false
}
}
},
“components”: {
“schemas”: {}
}
}