OpenAI: gpt-oss-120b

openai/gpt-oss-120b

OpenAI gpt-oss-120b API

Oxyy has not published a price for gpt-oss-120b yet. It accepts text and returns text, with a 131K-token context window. For every OpenAI model and rate, see OpenAI API pricing.

OpenAI's most powerful open-weight model, for production, general-purpose, high-reasoning use. Achieves near-parity with OpenAI o4-mini on core reasoning benchmarks.
ModalitiesTextText
PriceNot yet publishedAll OpenAI API pricing
Context131K
ReleasedAug 5, 2025

Providers

Where this model runs, and what each route costs. Requests are sent to a healthy provider automatically; if one errors, the gateway retries against another serving the same model.

ProviderPrice
OpenAINot yet published

Capabilities (9)

StreamingTool callingStructured outputReasoningFull Chain Of ThoughtFine TunableLocal InferenceSystem promptHarmony Format Required

Supported parameters (3)

reasoning_efforttoolsresponse_format

Any other parameter you send is ignored rather than rejected.

Pricing

Models on Oxyy are billed pay as you go, with no subscription. This one has no published price yet.

Price
Not yet published
Oxyy has not published a price for this model yet.
RateStandard priceChargedUnit
Price not yet published

Specifications

Model ID
gpt-oss-120b
Developer
OpenAI
Type
Text
Input
Text
Output
Text
Context window
131,072 tokens
Released
Aug 5, 2025
Tokenizer
GPT
Series
gpt-oss
Endpoint
/v1/chat/completions

Best for

Open weightsReasoningAgenticLocal inferenceApache 2.0

Quickstart

Call gpt-oss-120b with a POST to /v1/chat/completions on https://api.oxyy.ai, using your Oxyy API key from the OXYY_API_KEY environment variable. The same key works for every model in the catalog.

import os
from openai import OpenAI

client = OpenAI(
    base_url="https://api.oxyy.ai/v1",
    api_key=os.environ["OXYY_API_KEY"],
)

response = client.chat.completions.create(
    model="gpt-oss-120b",
    messages=[
        {"role": "user", "content": "Explain unified AI APIs in one sentence."},
    ],
)
print(response.choices[0].message.content)

Availability

The share of requests to this model that completed successfully over the last 30 days. When an upstream provider errors, the gateway retries against another provider serving the same model, so a single provider incident does not necessarily show up here.

Requests (30 days)
28
A success rate is shown from 100 completed requests
Days with traffic
6
of the last 30 days

Activity

Token volume and request traffic to this model over time. Daily totals, UTC.

Prompt78
Reasoning38
Completion48

Prompt tokens measure input size. Reasoning tokens show internal thinking before a response. Completion tokens reflect total output length.

Frequently asked questions

What is gpt-oss-120b?
OpenAI's most powerful open-weight model, for production, general-purpose, high-reasoning use. Achieves near-parity with OpenAI o4-mini on core reasoning benchmarks.
What is the context length of gpt-oss-120b?
gpt-oss-120b has a context window of 131,072 tokens.
Does gpt-oss-120b support tool calling and structured outputs?
Yes — gpt-oss-120b supports both tool calling and structured outputs.
What inputs and outputs does gpt-oss-120b support?
gpt-oss-120b accepts text as input and returns text.
Which API endpoint does gpt-oss-120b use?
Send a POST request to https://api.oxyy.ai/v1/chat/completions with "model": "gpt-oss-120b", authenticated with your Oxyy API key.
When was gpt-oss-120b released?
gpt-oss-120b was released on Aug 5, 2025.
What other models does OpenAI have?
OpenAI also offers chat-latest, GPT-4o, GPT-4o mini and GPT-5.1 through Oxyy.

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