OpenAI: gpt-oss-120b

apache-2.0120B

gpt-oss-120b is an open-weight, 117B-parameter Mixture-of-Experts (MoE) language model from OpenAI designed for high-reasoning, agentic, and general-purpose production use cases.

Intelligence
Reasoning
Speed
Context
131K
Max output
66K
Input price
$0.15/1M tokens
Output price
$0.6/1M tokens

Capabilities

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

Details

Model IDopenai/gpt-oss-120b
Provider OpenRouter
Creator OpenAI
Familygpt-oss
Licenseapache-2.0
Statusactive
Typechat
Input modalitiestext
Output modalitiestext
Open weightYes
Parameters120B
Architecture—
Context window131K tokens
Max input—
Max output66K tokens
Reasoning tokensYes
Knowledge cutoff
Release date
Sourceofficial

Tools

Function Callingfunction_calling
Call external functions and APIs

Pricing

Input
$0.15
Output
$0.6
Cache write
—
Cache read
$0.08
Batch in
—
Batch out
—

Family Comparison: gpt-oss

ModelContextMax outPricing
OpenAI: gpt-oss-120b (free)131K131K—
OpenAI: gpt-oss-20b (free)131K33K—
OpenAI: gpt-oss-20b131K33K$0.02$0.09
OpenAI: gpt-oss-20b (batch)131K118K$0.02$0.11
OpenAI: gpt-oss-120b (batch)131K118K$0.03$0.14
OpenAI: gpt-oss-safeguard-20b131K66K$0.08$0.3
OpenAI: gpt-oss-120b131K66K$0.15$0.6

API

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

OpenAI: gpt-oss-120b

openai/gpt-oss-120b

gpt-oss-120b is an open-weight, 117B-parameter Mixture-of-Experts (MoE) language model from OpenAI designed for high-reasoning, agentic, and general-purpose production use cases.

Changes · 18 entries
openai/gpt-oss-120bupdateca7a400Nov 2, 2026, 03:02 AM
pricinginput$0.039→$0.15output$0.18→$0.6cached input$0.075
max_output_tokens131072→65536
openai/gpt-oss-120bupdateb92059eOct 15, 2026, 06:37 AM
pricinginput$0.037→$0.15output$0.17→$0.6
max_output_tokens117964→65536
openai/gpt-oss-120bupdate0d5a9a1Oct 14, 2026, 06:38 AM
pricinginput$0.15→$0.037output$0.6→$0.17
max_output_tokens65536→117964
openai/gpt-oss-120bupdate29d19afOct 13, 2026, 06:43 AM
pricinginput$0.037→$0.15output$0.17→$0.6
max_output_tokens117964→65536
openai/gpt-oss-120bupdate6e8bf55Sep 30, 2026, 06:40 AM
pricinginput$0.15→$0.037output$0.6→$0.17
max_output_tokens65536→117964
openai/gpt-oss-120bupdate2ae168fSep 18, 2026, 06:37 AM
pricinginput$0.037→$0.15output$0.17→$0.6cached input$0.03→$0.075
max_output_tokens117964→65536
openai/gpt-oss-120bupdatee3d7dedAug 31, 2026, 04:13 AM
pricinginput$0.03→$0.037
max_output_tokens131072→117964
openai/gpt-oss-120bupdate3cddff5Aug 13, 2026, 02:54 AM
pricinginput$0.037→$0.03cached input$0.03
openai/gpt-oss-120bupdate20c73acJul 17, 2026, 02:34 AM
pricinginput$0.036→$0.037output$0.18→$0.17
openai/gpt-oss-120bupdate105275dJul 10, 2026, 12:00 AM
pricinginput$0.03→$0.036output$0.15→$0.18
openai/gpt-oss-120bupdate88d97e5Jun 30, 2026, 04:49 AM
pricinginput$0.039→$0.03output$0.18→$0.15
openai/gpt-oss-120bupdate9e091d8May 23, 2026, 05:20 PM
pricingoutput$0.19→$0.18
openai/gpt-oss-120bupdate73d11c6May 18, 2026, 03:39 AM
pricingoutput$0.18→$0.19
openai/gpt-oss-120bupdatebc0fb7dMay 2, 2026, 02:14 AM
pricingoutput$0.19→$0.18
openai/gpt-oss-120bupdatec8065d6Apr 25, 2026, 10:39 AM
max_output_tokens131072
openai/gpt-oss-120bupdate1cd659eMar 24, 2026, 04:19 AM
capabilitiesjson modeyes
openai/gpt-oss-120bupdate2b100acMar 23, 2026, 05:30 AM
model_typechat
parameters120
release_date2025-08-05
taglinegpt-oss-120b is an open-weight, 117B-parameter Mixture-of...
tools["function_calling"]
openai/gpt-oss-120bcreate7f5c66fMar 21, 2026, 05:16 AM