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gpt-oss-120b

Open-weight agentic model with configurable reasoning, full CoT visibility, strong tool use, and fine-tuning support.

🧠Reasoning🔧Tool calling
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Specifications

Context window131K tokens
Max output128K tokens
API typechat
AddedMar 2, 2026
Model IDnebius/openai/gpt-oss-120b
Data retentionNo
Used for trainingNo
Provider location🇪🇺 EU
Privacy policyNebius Privacy Policy →

Benchmarks

Benchmarks haven't been published yet for this exact variant.

Some variants (region-specific deployments, highspeed tiers) share benchmarks with their base model — check the base model page or the Nebius AI models overview.

Pricing

Input / 1M
$0.15
Output / 1M
$0.60
Cache write
—
Cache read
—
Estimated cost
100K input + 10K output$0.0210
1M input + 100K output$0.21
10M input + 1M output$2.10

Requesty charges exactly what the upstream provider charges — no markup, no per-request fees. Prompt caching and smart routing can reduce effective cost by 30-80%.

Quickstart

Drop-in compatible with the OpenAI SDK. Change the base URL, swap in your Requesty API key, and set the model to nebius/openai/gpt-oss-120b.

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from openai import OpenAI

client = OpenAI(
    api_key="YOUR_REQUESTY_API_KEY",
    base_url="https://router.requesty.ai/v1",
)

response = client.chat.completions.create(
    model="nebius/openai/gpt-oss-120b",
    messages=[
        {"role": "user", "content": "Explain quantum computing in one paragraph."},
    ],
)

print(response.choices[0].message.content)

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Frequently asked questions

How much does gpt-oss-120b cost?
gpt-oss-120b is priced at $0.15 per million input tokens and $0.60 per million output tokens when accessed via Requesty. Requesty charges exactly what the upstream provider charges — we don't add markup.
What is the context window of gpt-oss-120b?
gpt-oss-120b has a context window of 131K tokens, with a maximum output of 128K tokens per response. That's roughly 175 words of input you can fit in a single prompt.
What can gpt-oss-120b do?
gpt-oss-120b supports tool calling, extended reasoning. You can call it through any OpenAI-compatible client by pointing base_url to Requesty.
How do I use gpt-oss-120b with the OpenAI SDK?
Install the OpenAI SDK, set base_url to "https://router.requesty.ai/v1", set your API key to your Requesty key, and set the model to "nebius/openai/gpt-oss-120b". The Quickstart above shows Python, JavaScript and cURL snippets.

Access gpt-oss-120b through Requesty

One API key, 400+ models, OpenAI-compatible. No markup on provider prices, automatic failover, and smart caching built-in.

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