gpt-oss-120b vs o4 Mini (Comparative Analysis)
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Comparative Analysis: gpt-oss-120b vs. o4 Mini
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Overview
o4 Mini was released 3 months before gpt-oss-120b.
 gpt-oss-120b | o4 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 | April 16, 2025 1 year ago April 16th, 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 | o4 Mini | |
|---|---|---|
Input Types Supported input formats | 📝Text | 🖼️Image📝Text📁File |
Reasoning Controls Defaults and configurable reasoning effort | Always enabledEffort: High, Medium, LowDefault: Medium | Optional |
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 0.04x less expensive compared to o4 Mini for input tokens and roughly 0.04x less expensive for output tokens.
| gpt-oss-120b | o4 Mini | |
|---|---|---|
Input Token Cost Cost per million input tokens | $0.04 per million tokens | $1.10 per million tokens |
Output Token Cost Cost per million output tokens | $0.17 per million tokens | $4.40 per million tokens |
Web Search Cost Additional cost for each web search operation | Not specified | $0.01 per search |
Cache Read Cost Cost to reuse cached input tokens | Not specified | $0.28 per million tokens |
Benchmarks
Compare relevant benchmarks between gpt-oss-120b and o4 Mini.
| gpt-oss-120b | o4 Mini | |
|---|---|---|
Intelligence Index Overall model quality across independent evaluations | 23.8 (Artificial Analysis index; higher is better) | Benchmark not available. |
Coding Index Programming performance across independent evaluations | 30.4 (Artificial Analysis index; higher is better) | Benchmark not available. |
Agentic Index Ability to complete multi-step agentic tasks | 13.2 (Artificial Analysis index; higher is better) | Benchmark not available. |
Best Design Arena Score Highest human-preference Elo score across design arenas | 1,052 Elo (#89 in Game Dev (40.6% win rate)) | 1,061 Elo (#87 in Game Dev (50.0% win rate)) |
At a Glance
Quick overview of what makes gpt-oss-120b and o4 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 $0.04/M input and $0.17/M output tokens. Released August 5th, 2025.o4 Mini by OpenAI understands both text and images, 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 April 16th, 2025.Explore More Comparisons
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Technical analysis and explanations
🔬Science
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