GPT-OSS 120B

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Warning: GPT-OSS 120B is currently in beta mode and may exhibit unstable performance or behavior. Tool calling functionality is not available during the beta phase. Use with caution in production environments, as functionality is subject to change.

Summary: GPT-OSS 120B is a cutting-edge open-source Mixture of Experts (MoE) model, specifically optimized for agent workflows and complex reasoning tasks. This medium-sized model combines the efficiency of selective parameter activation with exceptional language understanding, making it ideal for research, development, and production environments where transparency, customization, and sophisticated AI capabilities are essential. Currently in beta with limited tool calling functionality.

Intelligence	Speed	Sovereignty	Input	Output
High	Medium	Medium	Text	Text

Central parameters

Description: Open-source Mixture-of-Experts architecture with efficient expert routing for optimized inference performance. Currently in beta with limited functionality.

Model identifier: openai/gpt-oss-120b

IONOS AI Model Hub Lifecycle and Alternatives

IONOS Launch	End of Life	Alternative	Successor
August 12, 2025	N/A	Llama 3.3 70B

Origin

Provider	Country	License	Flavor	Release
OpenAI	USA	Apache 2.0	Base	August 2025

Technology

Context window	Parameters	Quantization	Multilingual
128k	120B	MXFP4	Yes

Modalities

Text	Image	Audio
Input and output	Not supported	Not supported

Endpoints

Chat Completions	Embeddings	Image generation
v1/chat/completions	Not supported	Not supported

Features

Streaming	Tool calling
Supported	Not supported (Beta phase limitation)

Rate limits

Rate limits ensure fair usage and reliable access to the AI Model Hub. In addition to the contract-wide rate limits, no model-specific limits apply.