gpt-oss-120b

reasoningapache-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
131K

Capabilities

vision
tool call
structured output
reasoning
json mode
streaming
fine tuning
batch

Details

Provider OpenAI
Creator openai
Familygpt-oss
Licenseapache-2.0
Parameters120B
Statusactive
Input modalitiestext
Output modalitiestext
Architecture—
Knowledge cutoff
Training data cutoff—
Release date—
Deprecation date—
Typereasoning
Reasoning tokensYes
Max input—
Open weightYes
Sourceofficial
Last updated

Tools

Function Callingfunction_calling
Call external functions and APIs
Code Interpretercode_interpreter
Execute code in a sandbox
MCPmcp
Connect to Model Context Protocol servers
Web Searchweb_search
Search the web for information

Endpoints

ResponsesPOST
Stateful multi-turn conversationshttps://api.openai.com/v1/responses
BatchPOST
Async batch processing at lower costhttps://api.openai.com/v1/batches

Price across providers

ProviderInputOutputSince launch
DeepInfracheapest$0.04$0.17↓5%
OpenRoutercheapest$0.04$0.17↓5%
Cloudflare AI Gateway$0.04$0.19—
Novita AI$0.05$0.25—
Groq$0.15$0.6—
SambaNova Cloud$0.22$0.59—
Cerebras$0.35$0.75—
Vercel AI Gateway$0.35$0.75—

Family Comparison: gpt-oss

ModelContextMax outPricing
gpt-oss-120b131K131K
gpt-oss-20b131K131K

API

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

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).

gpt-oss-120b
Changes · 9 entries
gpt-oss-120bupdate118451aSep 24, 2026, 07:08 AM
description\→`gpt-oss-120b`is our most powerful open-weight model, whi...
gpt-oss-120bupdatee8ec634Mar 24, 2026, 07:27 PM
knowledge_cutoff2024-05→2024-06
gpt-oss-120bupdatefa2bbbbMar 24, 2026, 05:22 AM
capabilitiesjson modeno→yes
gpt-oss-120bupdatef43e286Mar 24, 2026, 04:45 AM
capabilitiesfine tuningyes→nojson modeyes→novisionnobatchyes
gpt-oss-120bupdate1cd659eMar 24, 2026, 04:19 AM
knowledge_cutoff2024-06→2024-05
capabilitiesfine tuningyesjson modeyes
page_urlhttps://platform.openai.com/docs/models/gpt-oss-120b→https://developers.openai.com/api/docs/models/gpt-oss-120b
gpt-oss-120bupdateb301ebeMar 23, 2026, 11:47 PM
knowledge_cutoff2024-05→2024-06
gpt-oss-120bupdate2b100acMar 23, 2026, 05:30 AM
licenseapache-2.0
parameters120
page_urlhttps://platform.openai.com/docs/models/gpt-oss-120b
open_weightyes
gpt-oss-120bupdateb50649fMar 21, 2026, 11:58 PM
descriptiongpt-oss-120b is an open-weight, 117B-parameter Mixture-of...→\
capabilitiesstreamingyes
knowledge_cutoff2024-05
model_typereasoning
reasoning_tokensyes
reasoning4
taglineMost powerful open-weight model, fits into an H100 GPU
tools["function_calling","code_interpreter","mcp","web_search"]
endpoints["responses","batch"]
snapshots["gpt-oss-120b"]
gpt-oss-120bcreate7f5c66fMar 21, 2026, 05:16 AM