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Cerebras Systems Chat API

The Chat API from Cerebras Systems — 1 operation(s) for chat.

Cerebras Systems Chat API is one of 5 APIs that Cerebras Systems publishes on the APIs.io network, described by a machine-readable OpenAPI specification.

Tagged areas include Chat. The published artifact set on APIs.io includes an OpenAPI specification, an API reference, API documentation, and authentication docs.

This API exposes 1 operation across 1 path, and defines 47 schemas. It is described by OpenAPI 3.2.0, at version 0.2.0.

Requests are made against the base URL https://api.cerebras.ai.

1 operations 1 paths 47 schemas 1 POST

Metadata

The identity and technical contract details declared by the specification.

Specification
OpenAPI 3.2.0
API Version
0.2.0
Base URL
https://api.cerebras.ai
Authentication
HTTP Bearer
Resource Areas
1

Authentication & Security 1

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

Paths & Operations 1

Across 1 path, the API surfaces 1 operation — 1 POST. Each is listed below with its method, path, parameters, and response codes.

Chat 1
POST
/v1/chat/completions
Chat
chat_v1_chat_completions_post 3 params body → 200422

Schemas 47

The contract defines 47 schemas that model the data the API accepts and returns. The most detailed are ChatCompletionRequest (31 properties), ChatChunkResponse (9 properties), ChatCompletionResponse (9 properties), ChatChunkChoice (7 properties). Each schema is shown below with its type and property counts.

ValidationError
object
3 properties 3 required
AssistantToolCall
object
A tool call for an assistant.
4 properties 3 required
ReasoningEffort
string
ChoiceObjectFunction
object
A function for a choice object.
1 property 1 required
ResponseFormatJSONObject
object
A response format for a JSON object.
1 property 1 required
ResponseFormatText
object
A response format for text.
1 property 1 required
SystemMessageRequest
object
A message request from the system.
3 properties 1 required
ServiceTier
string
HTTPValidationError
object
1 property
Tool
object
A tool object
2 properties 2 required
ChoiceObject
object
A choice object.
2 properties 2 required
TopLogProbs
object
3 properties 2 required
ChunkAssistantToolCall
object
Streaming only. Represents a function call in an assistant tool call.
4 properties 2 required
ChatChunkChoice
object
7 properties 1 required
UserMessageRequest
object
A message request from the user.
3 properties 1 required
ChatCompletionRequest
object
Generic base class for chat completion requests.
31 properties 2 required
ImageUrl
object
Image URL
2 properties 1 required
ErrorChunkResponse
object
2 properties 2 required
DeveloperMessageRequest
object
A message request from the developer: Currently only for openai models, where they are functionally the same as system
3 properties 1 required
ChunkAssistantToolCallFunction
object
Streaming only. Represents a function in an assistant tool call.
2 properties
ImageUrlContent
object
Image URL content for a message.
2 properties 2 required
AssistantToolCallFunction
object
A function call for an assistant tool.
2 properties 2 required
PromptTokensDetails
object
1 property
TimeInfo
object
Time information for different phases of request processing. All times are measured in seconds.
5 properties
ToolChoice
string
A tool choice object.
ChatCompletionChoice
object
5 properties 2 required
ToolMessageRequest
object
A message request from a tool.
4 properties 2 required
CompletionTokensDetails
object
3 properties
ChatChunkResponse
object
9 properties 5 required
FunctionObject
object
A function object.
4 properties 1 required
ChatCompletionLogProbs
object
2 properties
Prediction
object
2 properties 2 required
StreamOptions
object
Options for streaming.
1 property
ChunkResponseMessage
object
5 properties
ChatCompletionResponse
object
9 properties 6 required
LogProbsContent
object
4 properties 3 required
ImageContent
object
Image URL content for a message.
2 properties 2 required
Parameters
object
Represents the parameters a function accepts. This model is designed to be flexible to accommodate any JSON Schema. The key-value pairs you provide will define…
JSONSchema
object
A JSON Schema object.
4 properties 1 required
ChatCompletionResponseMessage
object
4 properties 1 required
ResponseFormatJSONSchema
object
A response format for a JSON schema.
2 properties 2 required
TextContent
object
Text content for a message.
2 properties 2 required
CreateChatCompletionResponse
AssistantMessageRequest
object
A message request from an assistant.
5 properties
ReasoningFormat
string
ErrorChunkContent
object
5 properties
Usage
object
6 properties

Specification

The full machine-readable OpenAPI contract behind this narrative.

Source

cerebras-systems-chat-api-openapi.yml Raw ↑

Other APIs Cerebras Systems publishes across the network.

Cerebras Systems Completions API
Cerebras Systems Models API
Cerebras Systems Public Models API
Cerebras Systems Tcp Warming API
Where this information came from

This is an independent, third-party profile of Cerebras Systems Chat API, published by API Evangelist. We do not operate, host, resell, or support these APIs, and we are not affiliated with or endorsed by the company unless stated above. Everything here is built from publicly available information — the company's own site, developer portal, documentation, public repositories, and the specifications it publishes for public use. Nothing is obtained by breaching a system, defeating an access control, or using credentials.

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