OpenAI GPT OSS

apache-2.0120B

`gpt-oss-120b`is our most powerful open-weight model, which fits into a single H100 GPU (117B parameters with 5.1B active parameters).

Intelligence
Reasoning
Speed
Context
131K
Max output
40K
Input price
$0.35/1M tokens
Output price
$0.75/1M tokens

Capabilities

Reasoning & Interaction
Reasoning
Tool Calling
Output Control
Structured Output
JSON Mode
Infrastructure
Streaming
Batch Processing
Prompt Caching

Details

Model IDgpt-oss-120b
Provider Cerebras
Creator OpenAI
Familygpt-oss
Licenseapache-2.0
Statusactive
Typechat
Input modalitiestext
Output modalitiestext
Open weightYes
Parameters120B
Architecture—
Context window131K tokens
Max input—
Max output40K tokens
Reasoning tokensYes
Knowledge cutoff
Release date—
Sourceofficial

Tools

Function Callingfunction_calling
Call external functions and APIs

Endpoints

Chat CompletionsPOST
Generate chat responses with messageshttps://api.cerebras.ai/v1/chat/completions
CompletionsPOST
Legacy text completionhttps://api.cerebras.ai/v1/completions

Pricing

Input
$0.35
Output
$0.75
Cache write
—
Cache read
—
Batch in
—
Batch out
—

API

GET/v1/models/cerebras/gpt-oss-120b