Open Source Model Open Source

OpenAI gpt-oss

OpenAI's open-weight language models designed for powerful reasoning, agentic tasks, and versatile developer use cases.

6/10 MegaOne Score

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Price Free / Open Source

Category Open Source Model

Model Open Source

Company OpenAI

Team Size 2,659

Total Funding $122.0B

About OpenAI gpt-oss

The OpenAI gpt-oss collection features two primary open-weight models: gpt-oss-120b (117B parameters, 5.1B active) and gpt-oss-20b (21B parameters, 3.6B active). Both are Mixture-of-Experts (MoE) models, offering strong reasoning capabilities, tool use (including web browsing, function calling, and Python execution), and are optimized for efficient deployment. The gpt-oss-120b model can run on a single 80GB GPU, while gpt-oss-20b requires just 16GB of memory, making them suitable for local inference and on-device use cases. Released under the permissive Apache 2.0 license, these models provide developers with significant control over deployment, customization, and fine-tuning.

Why We Scored It 6/10

6/10

OpenAI's gpt-oss models represent a significant strategic shift toward open-weight releases with 20K GitHub stars, but hold only a mid-tier market position in the competitive open-source landscape. While technically solid and backed by OpenAI's reputation, they face strong competition from established players like Meta's Llama and newer entrants like DeepSeek.

Features & Platform

Free Tier

OpenAI gpt-oss Coverage