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OpenAI’s first open-weight release since GPT-2. A 120B mixture-of-experts model with around 5B active parameters per token, strong general reasoning, and reliable function calling.
Sluggpt-oss-120b
Parameters120B (MoE, ~5B active)
Context131,072 tokens (128K)
Throughput70 tokens/sec
TTFT240ms
LicenseApache 2.0
Pricingcogito.decart.ai/models/gpt-oss-120b

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Best for

  • Default chat / agent
  • Coding assistance
  • Tool calling and structured outputs
  • Workloads where GPT-4-class output quality at open-weight pricing matters

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Sample request

from openai import OpenAI

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

response = client.chat.completions.create(
    model="gpt-oss-120b",
    messages=[{"role": "user", "content": "Hello!"}],
)

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License

Apache 2.0. Use it however you want, including commercial deployments. Cogito’s serving doesn’t change the license terms.