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GPT Opensources 120B
GPT Opensources 120B is a reasoning model developed by OpenAI. It has 117.0B parameters and a 128K context window, provided under an open license.
Parameters
117.0B
Context Window
128K
License
Apache 2.0
Release Date
2025-08-06
API Pricing
API pricing for this model is not yet available
Strengths
- ・Equipped with advanced reasoning ability
- ・128K wide context understanding
- ・Permissive Apache 2.0 license
Weaknesses
- ・Gigantic file size of 240GB
- ・High hardware requirements
- ・Increased operational costs
Use Cases
- ・Complex logical reasoning tasks
- ・Large-scale document analysis
- ・AI research in open source
Deep Analysis
Parameters
117B total / 5.1B active
MoE, 128 experts
AIME 2025
97.9%
With tools
GPQA Diamond
80.9%
With tools
SWE-Bench Verified
62.4%
With terminal
License
Apache 2.0
Release Date
August 5, 2025
Strengths
- ・Fully open-weight Apache 2.0
- ・97.9% AIME 2025 with tools
- ・Runs on single 80GB GPU (MXFP4)
- ・Native agentic capabilities
Weaknesses
- ・Text-only
- ・Higher hallucination than o4-mini
- ・Knowledge cutoff June 2024
- ・Requires harmony format
Competitor Comparison
| Model | SWE | GPQA | Price |
|---|---|---|---|
| DeepSeek R1 | ~55% | ~71% | Free |
| Qwen 3.5 | 62.5% | 82.1% | $0.50/$2.00 |
| OpenAI o4-mini | ~63% | $1.10/$4.40 |
GPT OSS 120B is OpenAI's first open-weight model (Apache 2.0). 117B MoE params, runs on single GPU. 97.9% AIME 2025 with tools.
Sources
Analysis generated: 2026-05-24