gpt-oss-120b vs o3 Mini (Comparative Analysis)
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Comparative Analysis: gpt-oss-120b vs. o3 Mini
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Overview
o3 Mini was released 6 months before gpt-oss-120b.
 gpt-oss-120b | o3 Mini | |
|---|---|---|
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 | 200K tokens |
Output Token Limit Maximum output tokens this model can generate at once | 131.1K tokens | 100K tokens |
Release Date When this model first became publicly available | August 5, 2025 11 months ago August 5th, 2025 | January 31, 2025 1 year ago January 31st, 2025 |
Capabilities & Features
Compare supported features, modalities, and advanced capabilities
gpt-oss-120b | o3 Mini | |
|---|---|---|
Input Types Supported input formats | 📝Text | 📝Text📁File |
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 Mode✓Content Moderation |
Open Source Model availability | Available on HuggingFace → | Proprietary |
Pricing
gpt-oss-120b is roughly 0.03x less expensive compared to o3 Mini for input tokens and roughly 0.03x less expensive for output tokens.
| gpt-oss-120b | o3 Mini | |
|---|---|---|
Input Token Cost Cost per million input tokens | $0.03 per million tokens | $1.10 per million tokens |
Output Token Cost Cost per million outut tokens | $0.15 per million tokens | $4.40 per million tokens |
Benchmarks
Compare relevant benchmarks between gpt-oss-120b and o3 Mini.
| gpt-oss-120b | o3 Mini | |
|---|---|---|
MMLU Measures knowledge across 57 subjects like law, math, history, and science | Benchmark not available. | Benchmark not available. |
MMMU Measures understanding of combined text and images across various domains | Benchmark not available. | Benchmark not available. |
HellaSwag Measures common sense reasoning by having models complete sentences about everyday situations | Benchmark not available. | Benchmark not available. |
At a Glance
Quick overview of what makes gpt-oss-120b and o3 Mini 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 $0.03/M input and $0.15/M output tokens. Released August 5th, 2025.o3 Mini by OpenAI can use external tools and APIs, offers advanced reasoning, generates structured data. It can handle standard conversations with its 200K token context window. Reasonably priced at $1.10/M input and $4.40/M output tokens. Includes built-in content moderation for safer outputs. Released January 31st, 2025.Explore More Comparisons
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