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STACKIT

GPT-OSS 120B API

STACKIT
About

Build advanced reasoning agents with GPT-OSS 120B, a specialized AI model optimized for complex logic and chain-of-thought tasks. This model delivers cost-effective pricing at $0.49/1M input and $0.71/1M output tokens, native tool calling support, open weights architecture. Access GPT-OSS 120B via the STACKIT API with up to 8K output tokens.

Capabilities

Input Modalities

text

Output Modalities

text
Reasoning
Yes
Structured Output
No
Tool Use
Yes
WeightsOpen
Temperature
Adjustable
Attachment
Not Supported
Limits
Context Window
131K

Tokens

Input Limit
131K

Tokens

Max Output
8K

Tokens

Pricing

Standard (per 1M tokens)

Input
$0.49
Output
$0.71
Frequently Asked Questions

GPT-OSS 120B by STACKIT costs $0.49 per 1M input tokens and $0.71 per 1M output tokens.

Model Details
ID
openai/gpt-oss-120b
Provider
STACKIT
Family
gpt
Release Date
Aug 5, 2025
Knowledge Cutoff
N/A
API Integration
NPM Package
@ai-sdk/openai-compatible
Environment Variables
STACKIT_API_KEY
API Base URL
https://api.openai-compat.model-serving.eu01.onstackit.cloud/v1
Documentation