inference

Inference

OpenAI GPT OSS 120B

Text

Model overview

Price

$0.15 - $0.60

Input - Output

Parameters

5.1B - 117B

Active - Total

Context window

131K

Release date

Aug 2025

OpenAI 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. It activates 5.1B parameters per forward pass. The model supports configurable reasoning depth, full chain-of-thought access, and structured output generation.

OpenAI

License: apache-2.0

openai/gpt-oss-120b

Use this model

import openai
import weave
# Weave autopatches OpenAI to log LLM calls to W&B
weave.init("<team>/<project>")
client = openai.OpenAI(
    # The custom base URL points to W&B Inference
    base_url='https://api.inference.wandb.ai/v1',
    # Get your API key from https://wandb.ai/authorize
    # Consider setting it in the environment as OPENAI_API_KEY instead for safety
    api_key="<your-apikey>",
    # Team and project are required for usage tracking
    project="<team>/<project>",
)
response = client.chat.completions.create(
    model="openai/gpt-oss-120b",
    messages=[
        {"role": "system", "content": "You are a helpful assistant."},
        {"role": "user", "content": "Tell me a joke."}
    ],
)
print(response.choices[0].message.content)

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