> ## Documentation Index > Fetch the complete documentation index at: https://openai-hd4n6.mintlify.site/llms.txt > Use this file to discover all available pages before exploring further. # Create thread > Create a thread. ## OpenAPI ````yaml api-definition.yaml post /threads openapi: 3.0.0 info: title: OpenAI API description: >- The OpenAI REST API. Please see https://platform.openai.com/docs/api-reference for more details. version: 2.3.0 termsOfService: https://openai.com/policies/terms-of-use contact: name: OpenAI Support url: https://help.openai.com/ license: name: MIT url: https://github.com/openai/openai-openapi/blob/master/LICENSE servers: - url: https://api.openai.com/v1 security: - ApiKeyAuth: [] tags: - name: Assistants description: Build Assistants that can call models and use tools. - name: Audio description: Turn audio into text or text into audio. - name: Chat description: >- Given a list of messages comprising a conversation, the model will return a response. - name: Completions description: >- Given a prompt, the model will return one or more predicted completions, and can also return the probabilities of alternative tokens at each position. - name: Embeddings description: >- Get a vector representation of a given input that can be easily consumed by machine learning models and algorithms. - name: Evals description: Manage and run evals in the OpenAI platform. - name: Fine-tuning description: Manage fine-tuning jobs to tailor a model to your specific training data. - name: Batch description: Create large batches of API requests to run asynchronously. - name: Files description: >- Files are used to upload documents that can be used with features like Assistants and Fine-tuning. - name: Uploads description: Use Uploads to upload large files in multiple parts. - name: Images description: Given a prompt and/or an input image, the model will generate a new image. - name: Models description: List and describe the various models available in the API. - name: Moderations description: >- Given text and/or image inputs, classifies if those inputs are potentially harmful. - name: Audit Logs description: List user actions and configuration changes within this organization. paths: /threads: post: tags: - Assistants summary: Create thread description: Create a thread. operationId: createThread requestBody: content: application/json: schema: $ref: '#/components/schemas/CreateThreadRequest' responses: '200': description: OK content: application/json: schema: $ref: '#/components/schemas/ThreadObject' components: schemas: CreateThreadRequest: type: object description: | Options to create a new thread. If no thread is provided when running a request, an empty thread will be created. additionalProperties: false properties: messages: description: >- A list of [messages](/docs/api-reference/messages) to start the thread with. type: array items: $ref: '#/components/schemas/CreateMessageRequest' tool_resources: type: object description: > A set of resources that are made available to the assistant's tools in this thread. The resources are specific to the type of tool. For example, the `code_interpreter` tool requires a list of file IDs, while the `file_search` tool requires a list of vector store IDs. properties: code_interpreter: type: object properties: file_ids: type: array description: > A list of [file](/docs/api-reference/files) IDs made available to the `code_interpreter` tool. There can be a maximum of 20 files associated with the tool. default: [] maxItems: 20 items: type: string file_search: type: object properties: vector_store_ids: type: array description: > The [vector store](/docs/api-reference/vector-stores/object) attached to this thread. There can be a maximum of 1 vector store attached to the thread. maxItems: 1 items: type: string vector_stores: type: array description: > A helper to create a [vector store](/docs/api-reference/vector-stores/object) with file_ids and attach it to this thread. There can be a maximum of 1 vector store attached to the thread. maxItems: 1 items: type: object properties: file_ids: type: array description: > A list of [file](/docs/api-reference/files) IDs to add to the vector store. There can be a maximum of 10000 files in a vector store. maxItems: 10000 items: type: string chunking_strategy: type: object description: >- The chunking strategy used to chunk the file(s). If not set, will use the `auto` strategy. oneOf: - type: object title: Auto Chunking Strategy description: >- The default strategy. This strategy currently uses a `max_chunk_size_tokens` of `800` and `chunk_overlap_tokens` of `400`. additionalProperties: false properties: type: type: string description: Always `auto`. enum: - auto x-stainless-const: true required: - type - type: object title: Static Chunking Strategy additionalProperties: false properties: type: type: string description: Always `static`. enum: - static x-stainless-const: true static: type: object additionalProperties: false properties: max_chunk_size_tokens: type: integer minimum: 100 maximum: 4096 description: >- The maximum number of tokens in each chunk. The default value is `800`. The minimum value is `100` and the maximum value is `4096`. chunk_overlap_tokens: type: integer description: > The number of tokens that overlap between chunks. The default value is `400`. Note that the overlap must not exceed half of `max_chunk_size_tokens`. required: - max_chunk_size_tokens - chunk_overlap_tokens required: - type - static x-oaiExpandable: true metadata: $ref: '#/components/schemas/Metadata' x-oaiExpandable: true oneOf: - required: - vector_store_ids - required: - vector_stores nullable: true metadata: $ref: '#/components/schemas/Metadata' ThreadObject: type: object title: Thread description: >- Represents a thread that contains [messages](/docs/api-reference/messages). properties: id: description: The identifier, which can be referenced in API endpoints. type: string object: description: The object type, which is always `thread`. type: string enum: - thread x-stainless-const: true created_at: description: The Unix timestamp (in seconds) for when the thread was created. type: integer tool_resources: type: object description: > A set of resources that are made available to the assistant's tools in this thread. The resources are specific to the type of tool. For example, the `code_interpreter` tool requires a list of file IDs, while the `file_search` tool requires a list of vector store IDs. properties: code_interpreter: type: object properties: file_ids: type: array description: > A list of [file](/docs/api-reference/files) IDs made available to the `code_interpreter` tool. There can be a maximum of 20 files associated with the tool. default: [] maxItems: 20 items: type: string file_search: type: object properties: vector_store_ids: type: array description: > The [vector store](/docs/api-reference/vector-stores/object) attached to this thread. There can be a maximum of 1 vector store attached to the thread. maxItems: 1 items: type: string nullable: true metadata: $ref: '#/components/schemas/Metadata' required: - id - object - created_at - tool_resources - metadata x-oaiMeta: name: The thread object beta: true example: | { "id": "thread_abc123", "object": "thread", "created_at": 1698107661, "metadata": {} } CreateMessageRequest: type: object additionalProperties: false required: - role - content properties: role: type: string enum: - user - assistant description: > The role of the entity that is creating the message. Allowed values include: - `user`: Indicates the message is sent by an actual user and should be used in most cases to represent user-generated messages. - `assistant`: Indicates the message is generated by the assistant. Use this value to insert messages from the assistant into the conversation. content: oneOf: - type: string description: The text contents of the message. title: Text content - type: array description: >- An array of content parts with a defined type, each can be of type `text` or images can be passed with `image_url` or `image_file`. Image types are only supported on [Vision-compatible models](/docs/models). title: Array of content parts items: oneOf: - $ref: '#/components/schemas/MessageContentImageFileObject' - $ref: '#/components/schemas/MessageContentImageUrlObject' - $ref: '#/components/schemas/MessageRequestContentTextObject' x-oaiExpandable: true minItems: 1 x-oaiExpandable: true attachments: type: array items: type: object properties: file_id: type: string description: The ID of the file to attach to the message. tools: description: The tools to add this file to. type: array items: oneOf: - $ref: '#/components/schemas/AssistantToolsCode' - $ref: '#/components/schemas/AssistantToolsFileSearchTypeOnly' x-oaiExpandable: true description: >- A list of files attached to the message, and the tools they should be added to. required: - file_id - tools nullable: true metadata: $ref: '#/components/schemas/Metadata' Metadata: type: object description: > Set of 16 key-value pairs that can be attached to an object. This can be useful for storing additional information about the object in a structured format, and querying for objects via API or the dashboard. Keys are strings with a maximum length of 64 characters. Values are strings with a maximum length of 512 characters. additionalProperties: type: string x-oaiTypeLabel: map nullable: true MessageContentImageFileObject: title: Image file type: object description: >- References an image [File](/docs/api-reference/files) in the content of a message. properties: type: description: Always `image_file`. type: string enum: - image_file x-stainless-const: true image_file: type: object properties: file_id: description: >- The [File](/docs/api-reference/files) ID of the image in the message content. Set `purpose="vision"` when uploading the File if you need to later display the file content. type: string detail: type: string description: >- Specifies the detail level of the image if specified by the user. `low` uses fewer tokens, you can opt in to high resolution using `high`. enum: - auto - low - high default: auto required: - file_id required: - type - image_file MessageContentImageUrlObject: title: Image URL type: object description: References an image URL in the content of a message. properties: type: type: string enum: - image_url description: The type of the content part. x-stainless-const: true image_url: type: object properties: url: type: string description: >- The external URL of the image, must be a supported image types: jpeg, jpg, png, gif, webp. format: uri detail: type: string description: >- Specifies the detail level of the image. `low` uses fewer tokens, you can opt in to high resolution using `high`. Default value is `auto` enum: - auto - low - high default: auto required: - url required: - type - image_url MessageRequestContentTextObject: title: Text type: object description: The text content that is part of a message. properties: type: description: Always `text`. type: string enum: - text x-stainless-const: true text: type: string description: Text content to be sent to the model required: - type - text AssistantToolsCode: type: object title: Code interpreter tool properties: type: type: string description: 'The type of tool being defined: `code_interpreter`' enum: - code_interpreter x-stainless-const: true required: - type AssistantToolsFileSearchTypeOnly: type: object title: FileSearch tool properties: type: type: string description: 'The type of tool being defined: `file_search`' enum: - file_search x-stainless-const: true required: - type securitySchemes: ApiKeyAuth: type: http scheme: bearer ````