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Model Library
/OpenAI/OpenAI gpt-oss-20b
fireworks/gpt-oss-20b

    Welcome to the gpt-oss series, OpenAI's open-weight models designed for powerful reasoning, agentic tasks, and versatile developer use cases. gpt-oss-20b is used for lower latency, and local or specialized use-cases.

    Fireworks Features

    Fine-tuning

    Docs

    OpenAI gpt-oss-20b can be customized with your data to improve responses. Fireworks uses LoRA to efficiently train and deploy your personalized model

    Serverless

    Docs

    Immediately run model on pre-configured GPUs and pay-per-token

    On-demand Deployment

    Docs

    On-demand deployments give you dedicated GPUs for OpenAI gpt-oss-20b using Fireworks' reliable, high-performance system with no rate limits.

    Available Serverless

    Run queries immediately, pay only for usage

    $0.07 / $0.30
    Per 1M Tokens (input/output)

    gpt-oss-20b FAQs

    Metadata

    State
    Ready
    Created on
    8/4/2025
    Kind
    Base model
    Provider
    OpenAI
    Hugging Face
    gpt-oss

    Specification

    Calibrated
    No
    Mixture-of-Experts
    Yes
    Parameters
    20.9B

    Supported Functionality

    Fine-tuning
    Supported
    Serverless
    Supported
    Serverless LoRA
    Not supported
    Context Length
    131.1k tokens
    Function Calling
    Not supported
    Embeddings
    Not supported
    Rerankers
    Not supported
    Support image input
    Not supported