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OpenAI GPT OSS 120B

openai/gpt-oss-120b
gpt-oss-120b is an open-source, 117-billion-parameter Mixture-of-Experts (MoE) language model from OpenAI designed for high-reasoning, agentic, and general-purpose production use cases. It activates 5.1 billion parameters per forward pass and is optimized to run on a single H100 GPU with native MXFP4 quantization. The model supports configurable reasoning depth, full chain-of-thought access, and native tool usage, including function calling, browsing, and structured output generation.
Price
Input$0.1 per million tokens
Output$0.5 per million tokens

Use the following code example to integrate our API:

1from openai import OpenAI
2
3client = OpenAI(
4    api_key="<Your API Key>",
5    base_url="https://api.highwayapi.ai/openai"
6)
7
8response = client.chat.completions.create(
9    model="openai/gpt-oss-120b",
10    messages=[
11        {"role": "system", "content": "You are a helpful assistant."},
12        {"role": "user", "content": "Hello, how are you?"}
13    ],
14    max_tokens=131072,
15    temperature=0.7
16)
17
18print(response.choices[0].message.content)

Information

Provider
Quantification
bf16

Supported Features

Context length
131072
Maximum output
131072
Function call
Support
Structured output
Support
Reasoning
Support
serverless
Support
Input Capabilities
text, image
Output Capabilities
text
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