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

OpenAI GPT OSS

gpt-oss-120b

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

Changes · 6 entries
gpt-oss-120bupdateca7a400Nov 2, 2026, 03:02 AM
endpoints["chat_completions"]→["chat_completions","completions"]
gpt-oss-120bupdate118451aSep 24, 2026, 07:08 AM
endpoints["chat_completions"]→["chat_completions","completions"]
gpt-oss-120bupdate1cd659eMar 24, 2026, 04:19 AM
capabilitiesjson modeyes
gpt-oss-120bupdate2b100acMar 23, 2026, 05:30 AM
parameters120 billion→120
reasoning_tokensyes
open_weightyes
tools["function_calling"]
gpt-oss-120bupdate7a4f1f6Mar 22, 2026, 05:43 AM
namegpt-oss-120b→OpenAI GPT OSS
capabilitiesvisionyesprompt cachingyes
model_typechat
statusactive
endpoints["chat_completions"]
model_card_urlhttps://openai.com/index/gpt-oss-model-card/
tokens_per_second3000
parameters120 billion
precisionFP16/FP8 (weights only)
huggingface_urlhttps://huggingface.co/openai/gpt-oss-120b
gpt-oss-120bcreate7f5c66fMar 21, 2026, 05:16 AM