OpenAI
GPT 120B
Open-weight GPT model for self-hosted reasoning and instruction-following workloads
Model facts
- Context window
- 128K tokens
- Maximum output
- 128K tokens
- Cheapest paid input
- $0.1 per 1M tokens
- Cheapest paid output
- $0.5 per 1M tokens
- Open weights
- yes
- Providers
- 1
Capabilities and modalities
reasoning, tool calling, structured output, temperature control, open weights, text.
Local hardware estimate
At 4K context: Q4_K_M 72.5 GiB, Q8_0 126.9 GiB, F16 228.9 GiB working memory.
- Parameters
- 116.8 billion
- Architecture
- gptoss
- Model license
- apache-2.0
Planning estimate adapted from the MIT-licensed whichllm estimator using metadata from Hugging Face; not a vendor minimum requirement.
Observed price history
- 2026-08-24: $0.1 input / $0.5 output per 1M tokens
API providers
- Baseten (OpenAI) — model id openai/gpt-oss-120b; $0.1 input / $0.5 output per 1M tokens; provider documentation