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Ollama

Ollama Chat Completions API

Generate chat completions using the OpenAI-compatible chat endpoint with multi-turn conversation support.

Documentation Provider Profile APIs.io OpenAPI GitHub

Ollama Chat Completions API is one of 13 APIs that Ollama publishes on the APIs.io network, described by a machine-readable OpenAPI specification.

Tagged areas include Chat Completions. The published artifact set on APIs.io includes an OpenAPI specification, API documentation, a getting-started guide, and authentication docs.

This API exposes 2 operations across 2 paths, and defines 17 schemas. It is described by OpenAPI 3.2.0, at version 0.1.0.

Requests are made against a single base URL, http://localhost:11434/v1.

2 operations 2 paths 17 schemas 2 POST

Metadata

The identity and technical contract details declared by the specification.

Specification
OpenAPI 3.2.0
API Version
0.1.0
Base URL
http://localhost:11434/api
Authentication
HTTP Bearer
Contact
Ollama Team
License
MIT
Resource Areas
1

Authentication & Security 1

Ollama Chat Completions API declares 1 security scheme for authenticating requests. It accepts HTTP bearer tokens (bearerAuth). By default, every request must be authenticated.

  • bearerAuth — API key authentication. The key is accepted but not validated by Ollama. Use any value such as ollama.

Paths & Operations 2

Across 2 paths, the API surfaces 2 operations — 2 POST. Each is listed below with its method, path, parameters, and response codes.

Chat Completions 2

Generate chat completions using the OpenAI-compatible chat endpoint with multi-turn conversation support.

POST
/chat/completions
Ollama Create chat completion
createChatCompletion body → 200400404
POST
/api/chat
Ollama Generate a chat completion
generateChatCompletion body → 200400404

Schemas 17

The contract defines 17 schemas that model the data the API accepts and returns. The most detailed are ModelOptions (14 properties), ChatCompletionRequest (13 properties), ChatResponse (12 properties), ChatRequest (10 properties). Each schema is shown below with its type and property counts.

ContentPart
object
A content part within a multimodal message.
3 properties 1 required
ChatCompletionStreamResponse
object
A streaming chat completion chunk.
5 properties
UsageStats
object
Token usage statistics for the request.
3 properties
ChatCompletionRequest
object
Request body for creating a chat completion in OpenAI-compatible format.
13 properties 2 required
ChatCompletionResponse
object
Response object from a chat completion request.
6 properties
ChatCompletionMessage
object
A message in the chat conversation.
5 properties 1 required
OpenAIToolDefinition
object
A tool definition in OpenAI-compatible format.
2 properties 2 required
OpenAIToolCall
object
A tool call generated by the model.
3 properties
ChatCompletionChoice
object
A single chat completion choice.
3 properties
Logprob
object
Log probability information for a generated token.
4 properties
ChatRequest
object
Request body for generating a chat completion from a conversation.
10 properties 2 required
ChatResponse
object
Response object from a chat completion request. When streaming, partial objects are returned until done is true.
12 properties
ToolCall
object
A tool call requested by the model during function calling.
1 property
ToolDefinition
object
A definition of a tool that the model may call during conversation for function calling.
2 properties 2 required
ChatMessage
object
A message in a chat conversation, containing a role, content, and optional images or tool calls.
5 properties 2 required
ErrorResponse
object
An error response returned when a request fails.
1 property
ModelOptions
object
Runtime options that control text generation behavior. These override the model's default parameter values.
14 properties

Specification

The full machine-readable OpenAPI contract behind this narrative.

Source

ollama-chat-completions-api-openapi.yml Raw ↑

Other APIs Ollama publishes across the network.

Ollama OpenAI Compatibility API
AE Profile APIs.io
Ollama Anthropic Compatibility API
AE Profile APIs.io
Ollama Cloud API
AE Profile APIs.io
Ollama Blobs API
AE Profile APIs.io
Ollama Completions API
AE Profile APIs.io
Ollama Embeddings API
AE Profile APIs.io
Ollama Generate API
AE Profile APIs.io
Ollama Images API
AE Profile APIs.io
Ollama Models API
AE Profile APIs.io
Ollama Responses API
AE Profile APIs.io
Ollama Running Models API
AE Profile APIs.io
Ollama Version API
AE Profile APIs.io
#Chat Completions
← Back to O APIs
API Details
ID
ollama:ollama-chat-completions-api
Base URL
http://localhost:11434/api
Docs
https://docs.ollama.com/api/introduction
Provider
Ollama
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