Integration · Developer tools

Connect Claude & ChatGPT to the OpenAI API

Give your AI access to your own OpenAI API account. It can generate text with an OpenAI model of your choice, create embeddings, run content through moderation and search the files in your vector stores. It can also look up stored responses, files and batch jobs, so you can check on work you already run through the API.

Connect OpenAI (ChatGPT) free

Free plan, no credit card. Takes about a minute.

Try asking

“Ask gpt-5.4-mini to write three subject lines for this newsletter.”
The AI sends the prompt to the OpenAI Responses API with that model and returns the generated text.
“Search our product docs vector store for the refund policy.”
It runs a search on the vector store and returns the most relevant passages from your files.
“Check these five customer comments for harmful content.”
It sends the texts to the moderation endpoint and reports which ones are flagged and why.

What your AI can do

Text generation

Call the Responses and Chat Completions APIs with the model, instructions and tools you choose, and continue earlier conversations.

Embeddings and moderation

Create embedding vectors for text and check text against OpenAI's moderation categories.

Files and vector stores

List and inspect uploaded files, create vector stores, attach files and search them for relevant passages.

“Which models can our API key use?”
It lists the models available to your OpenAI account.
“How is the batch job from yesterday doing?”
It lists your batch jobs and reads the status and request counts of the one you mean.
“Add the uploaded price list file to our support vector store.”
It attaches the already-uploaded file to the vector store so it gets indexed for search.

53 tools for OpenAI (ChatGPT)

These tools are switched on when you connect. You can switch any of them off, or require your approval before it runs.

add_conversation_itemsChanges dataAdd up to 20 items, such as user or assistant messages, to a conversation by `conversation_id`.
add_file_to_vector_storeChanges dataAttach an already-uploaded file (`file_id`) to a vector store so it is chunked and indexed for search.
cancel_batchMoves moneyCancel an in-progress batch job by `batch_id`. Requests already completed are still billed.
cancel_file_batchMoves moneyCancel a file batch (batch id). Financial or irreversible action; may require approval. API summary: Cancel vector store file batch.
cancel_responseDeletesCancel a response (response id). Destructive action; may require approval.
create_batchVisible to othersCreate a new batch. Required: input file id, endpoint or completion window. Has effects visible outside this system. API summary: Create batch.
create_chat_completionChanges dataGenerate a reply with the Chat Completions API from a `model` and a `messages` list of {role, content}. Usage is billed to your OpenAI account.
create_compactChanges dataCreate a new compact. Required: model. API summary: Compact conversation.
create_conversationChanges dataCreate a conversation that can hold items across several responses; pass its ID as `conversation` when generating a response.
create_editChanges dataCreate a new edit. Required: images or prompt. API summary: Create image edit.
create_embeddingChanges dataCreate embedding vectors for text in `input` (a string or list of strings) with an embedding `model` such as text-embedding-3-small. Usage is billed to your OpenAI account.
create_generationChanges dataCreate a new generation. Required: prompt. API summary: Create image.
create_input_tokenDeletesCreate a new input token. Destructive action; may require approval. API summary: Get input token counts.
create_speechChanges dataCreate a new speech. Required: model, input or voice. API summary: Create speech.
create_vector_storeChanges dataCreate a vector store with a `name` and optional already-uploaded `file_ids` to index for file search. Storage is billed to your OpenAI account.
create_vector_store_file_batchVisible to othersCreate a new file batch for a vector store. Has effects visible outside this system. API summary: Create vector store file batch.
delete_completionDeletesPermanently delete a completion by completion id. Destructive action; may require approval. API summary: Delete chat completion.
delete_conversationDeletesDelete a conversation by `conversation_id`. Per the API, the items in it are not deleted. This cannot be undone.
delete_fileDeletesPermanently delete an uploaded file by `file_id`. This cannot be undone.
delete_message_productDeletesPermanently delete a product by product id. Destructive action; may require approval. API summary: Delete an item.
delete_modelDeletesPermanently delete a model by model. Destructive action; may require approval. API summary: Delete a fine-tuned model.
delete_responseDeletesPermanently delete a stored response by `response_id`. This cannot be undone.
delete_vector_storeDeletesPermanently delete a vector store by vector store id. Destructive action; may require approval. API summary: Delete vector store.
download_documentDownload the document for a document. API summary: Retrieve file content.
generate_responseChanges dataGenerate text with an OpenAI model via the Responses API: pass `model` and `input` (text or message items), optionally `instructions`, `tools` like web_search, or `previous_response_id` to continue a thread. Usage is billed to your OpenAI account.
get_batchGet one batch job by `batch_id`, including status and output file IDs.
get_chat_completionGet a stored chat completion by `completion_id`.
get_conversationGet a conversation by `conversation_id`, including its metadata.
get_fileGet metadata for an uploaded file by `file_id`: name, size, purpose and status.
get_message_productGet one product for a message by product id. API summary: Retrieve an item.
get_modelGet basic details for one model by `model` ID.
get_responseGet a stored response by `response_id`, including its output text, status and token usage.
get_vector_storeGet one vector store by `vector_store_id`.
get_vector_store_documentGet one document for a vector store by document id. API summary: Retrieve vector store file.
get_vector_store_file_batchGet one file batch for a vector store by batch id. API summary: Retrieve vector store file batch.
list_batchesList your Batch API jobs with their status and request counts.
list_chat_completionsList stored chat completions (only those created with store=true), optionally filtered by model or metadata.
list_completion_messagesList messages for a completion. Optional filters: order. Results are paginated. API summary: Get chat messages.
list_conversation_itemsList the items (messages, tool calls, outputs) in a conversation by `conversation_id`.
list_filesList files uploaded to your OpenAI account, optionally filtered by `purpose` (assistants, batch, fine-tune, vision, user_data).
list_modelsList the models available to your OpenAI account, with their IDs and owners.
list_response_input_itemsList the input items that were sent to create a stored response, by `response_id`.
list_vector_store_filesList the files attached to a vector store by `vector_store_id`, with their indexing status.
list_vector_storesList your vector stores (knowledge bases used by file search), with file counts and status.
moderate_contentChanges dataCheck text (or text and image inputs) against OpenAI's moderation categories and get flagged categories and scores.
remove_file_from_vector_storeDeletesRemove a file from a vector store by `vector_store_id` and `file_id`. The file itself is not deleted.
retrieve_vector_store_file_contentList documents for a document. API summary: Retrieve vector store file content.
search_file_batch_documentsSearch documents for a file batch by order, before or filter. Use this to find existing documents before creating a new document. Results are paginated. API summary: List vector store files in a batch.
search_vector_storeChanges dataSearch the indexed files in a vector store by `vector_store_id` with a natural-language `query` and get the most relevant chunks.
update_completionChanges dataUpdate an existing completion identified by completion id. API summary: Update chat completion.
update_messageChanges dataUpdate an existing message identified by message id. API summary: Update a conversation.
update_vector_storeChanges dataUpdate an existing vector store identified by vector store id. API summary: Modify vector store.
update_vector_store_documentChanges dataUpdate an existing document identified by document id. API summary: Update vector store file attributes.

Set up in three steps

1
Pick the app
Create a free HeyMyApps account and choose OpenAI (ChatGPT) from the app list.
2
Paste your key
Paste an OpenAI API key. Sign in at platform.openai.com, open Settings > API keys and click Create new secret key, then copy the key, which is shown only once. API usage is billed to your OpenAI API account, separately from any ChatGPT subscription.
3
Add the link to your AI
You get a personal MCP link. Add it to Claude, ChatGPT or Cursor:
1. Click your name, then Settings › Connectors › Add custom connector.
2. Paste your link as the Remote MCP server URL.
3. Switch it on from the + menu in a chat.

Questions

What can the AI do in the OpenAI API?

It can generate responses and chat completions, create embeddings, run moderation checks, list models, and work with stored responses, conversations, files, vector stores and batch jobs. It can create vector stores and conversations, attach files, and delete files, responses and conversations.

Does the AI see my OpenAI API key?

No. Your OpenAI API key is encrypted at rest and never shown to the AI. After you save it, it is not shown again, not even to you. The AI only sees the results of the tools it calls.

Can I control what the AI is allowed to do?

Yes. You choose which tools are switched on. Generating text and embeddings uses paid API credit, and deleting files or responses is permanent, so these tools can require your approval before they run. Every tool call is logged.

Does it work with ChatGPT?

Yes. In ChatGPT go to Settings › Apps & Connectors › Advanced and turn on Developer mode, then add your HeyMyApps link. Developer mode needs a paid ChatGPT plan: Plus, Pro, Business or Enterprise. The same link also works in Claude (Settings › Connectors › Add custom connector), Cursor and other MCP clients.

What does it cost?

HeyMyApps has a free plan with no credit card required. Paid plans bill per completed task. OpenAI bills your API usage to your own OpenAI account.

Is this the same as my ChatGPT subscription?

No. This connects the OpenAI API with an API key from platform.openai.com. API usage is billed separately from a ChatGPT Plus, Pro, Business or Enterprise subscription, and it does not give access to your ChatGPT chat history.