gpt-oss-120b vs gpt-oss-20b (Comparative Analysis)
Loading comparison form...
Comparative Analysis: gpt-oss-120b vs. gpt-oss-20b
Want to try out these models side by side?Try Magica for free
Overview
gpt-oss-20b was released 0 day before gpt-oss-120b.
 gpt-oss-120b | gpt-oss-20b | |
|---|---|---|
Model Provider The organization behind this AI's development | OpenAI | OpenAI |
Input Context Window Maximum input tokens this model can process at once | 131.1K tokens | 131.1K tokens |
Output Token Limit Maximum output tokens this model can generate at once | 131.1K tokens | 131.1K tokens |
Release Date When this model first became publicly available | August 5, 2025 11 months ago August 5th, 2025 | August 5, 2025 11 months ago August 5th, 2025 |
Knowledge Cutoff Latest training-data date reported by the provider | June 30, 2024 | June 30, 2024 |
Capabilities & Features
Compare supported features, modalities, and advanced capabilities
gpt-oss-120b | gpt-oss-20b | |
|---|---|---|
Input Types Supported input formats | 📝Text | 📝Text |
Reasoning Controls Defaults and configurable reasoning effort | Always enabledEffort: High, Medium, LowDefault: Medium | Always enabledEffort: High, Medium, LowDefault: Medium |
Output Types Supported output formats | 📝Text | 📝Text |
Tokenizer Text encoding system | GPT | GPT |
Key Features Advanced capabilities | ✓Function Calling✓Structured Output✓Reasoning ModeContent Moderation | ✓Function Calling✓Structured Output✓Reasoning ModeContent Moderation |
Open Source Model availability | Available on HuggingFace → | Available on HuggingFace → |
Pricing
gpt-oss-120b is roughly 1.3x more expensive compared to gpt-oss-20b for input tokens and roughly 1.2x more expensive for output tokens.
| gpt-oss-120b | gpt-oss-20b | |
|---|---|---|
Input Token Cost Cost per million input tokens | $0.04 per million tokens | $0.03 per million tokens |
Output Token Cost Cost per million output tokens | $0.17 per million tokens | $0.14 per million tokens |
Benchmarks
Compare relevant benchmarks between gpt-oss-120b and gpt-oss-20b.
| gpt-oss-120b | gpt-oss-20b | |
|---|---|---|
Intelligence Index Overall model quality across independent evaluations | 23.8 (Artificial Analysis index; higher is better) | 14.9 (Artificial Analysis index; higher is better) |
Coding Index Programming performance across independent evaluations | 30.4 (Artificial Analysis index; higher is better) | 20.7 (Artificial Analysis index; higher is better) |
Agentic Index Ability to complete multi-step agentic tasks | 13.2 (Artificial Analysis index; higher is better) | 3.1 (Artificial Analysis index; higher is better) |
Best Design Arena Score Highest human-preference Elo score across design arenas | 1,050 Elo (#91 in Game Dev (40.6% win rate)) | 966 Elo (#100 in Data Viz (39.7% win rate)) |
At a Glance
Quick overview of what makes gpt-oss-120b and gpt-oss-20b unique.
gpt-oss-120b by OpenAI can use external tools and APIs, offers advanced reasoning, generates structured data. It can handle standard conversations with its 131.1K token context window. Very affordable at $0.04/M input and $0.17/M output tokens. Released August 5th, 2025.gpt-oss-20b by OpenAI can use external tools and APIs, offers advanced reasoning, generates structured data. It can handle standard conversations with its 131.1K token context window. Very affordable at $0.03/M input and $0.14/M output tokens. Released August 5th, 2025.Explore More Comparisons
Compare your models with top performers across different categories
Compare gpt-oss-120b with:
🚀Programming
Best models for coding and development
🎨Creative & Roleplay
Models optimized for creative writing
📢Marketing
Content creation and marketing tasks
💻Technology
Technical analysis and explanations
🔬Science
Scientific research and analysis
🌐Translation
Multilingual translation tasks
Compare gpt-oss-20b with:
🚀Programming
Best models for coding and development
🎨Creative & Roleplay
Models optimized for creative writing
📢Marketing
Content creation and marketing tasks
💻Technology
Technical analysis and explanations
🔬Science
Scientific research and analysis
🌐Translation
Multilingual translation tasks