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Weights & Biases

gpt-oss-120b API

Weights & Biases
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 $0.03/1M input and $0.17/1M output tokens, native tool calling support, open weights architecture. Access gpt-oss-120b via the Weights & Biases API with up to 131K output tokens.

Capabilities

Input Modalities

text

Output Modalities

text
Reasoning
Yes
Structured Output
Yes
Tool Use
Yes
WeightsOpen
Temperature
Adjustable
Attachment
Not Supported
Limits
Context Window
131K

Tokens

Input Limit
131K

Tokens

Max Output
131K

Tokens

Pricing

Standard (per 1M tokens)

Input
$0.03
Output
$0.17

Caching (per 1M tokens)

Read
$0.03
Frequently Asked Questions

gpt-oss-120b by Weights & Biases costs $0.03 per 1M input tokens and $0.17 per 1M output tokens. Cached reads cost $0.03 per 1M tokens.

Model Details
ID
openai/gpt-oss-120b
Provider
Weights & Biases
Family
gpt-oss
Release Date
Aug 5, 2025
Knowledge Cutoff
N/A
API Integration
NPM Package
@ai-sdk/openai-compatible
Environment Variables
WANDB_API_KEY
API Base URL
https://api.inference.wandb.ai/v1
Documentation