# Together AI — OpenAI's New Open gpt-oss Models vs o4-mini: A Real-World Comparison

- Company: Together AI (together.ai)
- Announced: 2025-08-11T00:00:00+00:00
- Category: model-update
- Subject: Inference platform
- Open weights: yes
- Models affected: gpt-oss-120B, gpt-oss, o4-mini
- License: Apache 2.0
- Pricing: 100x cheaper than Claude Opus 4.1
- Source: https://www.together.ai/blog/openais-new-open-gpt-oss-models-vs-o4-mini-a-real-world-comparison
- Record: https://forck.live/items/2416-openai-s-new-open-gpt-oss-models-vs-o4-mini-a-real-world-comparison

Together AI announces support for OpenAI's newly open-sourced gpt-oss models (20B and 120B parameters) on its platform and publishes a comparison of gpt-oss-120B against o4-mini across five practical tests, claiming gpt-oss-120B wins 4.5/5 vs 3/5.

## Evidence

Verbatim from https://www.together.ai/blog/openais-new-open-gpt-oss-models-vs-o4-mini-a-real-world-comparison:

> OpenAI just made history by open-sourcing their first language models in over six years. The gpt-oss series includes two reasoning models: a 20B parameter model comparable to o3-mini, and a 120B model that supposedly rivals o4-mini. As champions of open source AI, we were excited to see how these models perform in practice. At Together AI, we believe the future of AI is open source. That's why we immediately added the gpt-oss models to our platform and decided to put the 120B model head-to-head against o4-mini across five practical tests.

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Record: https://forck.live/items/2416-openai-s-new-open-gpt-oss-models-vs-o4-mini-a-real-world-comparison
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