# Together AI — Transform OpenAI gpt-oss Models into Domain Experts with Together AI Fine-Tuning

- Company: Together AI (together.ai)
- Announced: 2025-08-19T00:00:00+00:00
- Category: capability-change
- Subject: Inference platform
- Open weights: yes
- Models affected: gpt-oss-120B, gpt-oss-20B
- License: Apache 2.0
- Context window: 16K context window for supervised fine-tuning (SFT); 8K context window for direct preference optimization (DPO)
- Source: https://www.together.ai/blog/fine-tune-gpt-oss-models-into-domain-experts-together-ai
- Record: https://forck.live/items/2414-transform-openai-gpt-oss-models-into-domain-experts-with-together-ai-fine-tuning

Together AI announces that OpenAI's open-weight gpt-oss-120B and gpt-oss-20B models are now available on its platform for fine-tuning, enabling organizations to customize these models for domain-specific tasks using Together AI's fine-tuning infrastructure.

## Evidence

Verbatim from https://www.together.ai/blog/fine-tune-gpt-oss-models-into-domain-experts-together-ai:

> The release of OpenAI's gpt-oss-120B and gpt-oss-20B models marks a pivotal moment in AI development. ... These are now available on Together AI Inference for customers to use.

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Record: https://forck.live/items/2414-transform-openai-gpt-oss-models-into-domain-experts-with-together-ai-fine-tuning
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