AI model comparison
gpt-oss-120b vs o3 Mini
Pricing, context window, benchmarks, and features compared side by side. Or skip the guesswork and send one prompt to both.
OpenAI
gpt-oss-120b
gpt-oss-120b is an open-weight, 117B-parameter Mixture-of-Experts (MoE) language model from OpenAI designed for high-reasoning, agentic, and general-purpose production use cases.
- Input / 1M
- $0.15
- Output / 1M
- $0.60
- Context
- 131K
OpenAI
o3 Mini
OpenAI o3-mini is a cost-efficient language model optimized for STEM reasoning tasks, particularly excelling in science, mathematics, and coding.
- Input / 1M
- $1.10
- Output / 1M
- $4.40
- Context
- 200K
At a glance
Quick verdict
How the two models stack up on the things people ask about most.
Lower price
gpt-oss-120b
7.3x cheaper for a typical chat
Higher intelligence score
o3 Mini
12.5 vs 11.6 on Artificial Analysis
Larger context window
o3 Mini
200K vs 131K tokens
Newer release
gpt-oss-120b
Released August 5, 2025
Benchmarks
Benchmark scores
Independent scores from Artificial Analysis. Higher is better.
Intelligence index
gpt-oss-120b11.6o3 Mini12.5Coding index
gpt-oss-120b30.4o3 MiniNot availableAgentic index
gpt-oss-120b3.7o3 MiniNot availablePricing
gpt-oss-120b vs o3 Mini API pricing
Per-token API rates. Cheaper option highlighted.
| Metric | gpt-oss-120b | o3 Mini |
|---|---|---|
| Input tokensPer 1M tokens | $0.15 | $1.10 |
| Output tokensPer 1M tokens | $0.60 | $4.40 |
| Cached input (read)Per 1M tokens | $0.08 | $0.55 |
| Cache writePer 1M tokens | Not available | Not available |
| Web searchPer request | Not available | $0.01 |
What it costs in practice
Estimated cost per 1,000 requests at standard rates. Coding and long-document figures also show the cost when the input is already cached.
Chat message
2K in, 500 out
gpt-oss-120b$0.60o3 Mini$4.40Coding task
30K in, 4K out
gpt-oss-120b$6.90$4.65 cachedo3 Mini$50.60$34.10 cachedLong document summary
150K in, 2K out
gpt-oss-120b$23.70$12.45 cachedo3 Mini$173.80$91.30 cachedSpecs
Context window and capabilities
How much each model can read, how much it can write, and what it accepts as input.
| Metric | gpt-oss-120b | o3 Mini |
|---|---|---|
| Context window | 131K tokens | 200K tokens |
| Max output | 66K tokens | 100K tokens |
| Input types | Text | File, Text |
| Output types | Text | Text |
| Reasoning effort levels | High, Medium, Low | Not available |
| Default reasoning effort | Medium | Not available |
| Release date | August 5, 2025 | January 31, 2025 |
Features
Supported features
API features available for each model.
| Metric | gpt-oss-120b | o3 Mini |
|---|---|---|
| Tool calling | Supported | Supported |
| Structured outputs | Supported | Supported |
| JSON mode | Supported | Supported |
| Reasoning | Supported | Supported |
| Temperature | Supported | Not supported |
| Stop sequences | Supported | Not supported |
| Deterministic seed | Supported | Supported |
| Verbosity control | Not supported | Not supported |
Keep exploring
More on these models
Other head-to-heads, the full model page, and the alternatives list for each model.
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o3 MiniView full model details- o3 Mini vs Claude Haiku 4.5
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- o3 Mini vs Gemini 2.5 Flash
- o3 Mini vs Mistral Medium 3.5
- o3 Mini vs R1 0528
- o3 Mini vs Command A
- o3 Mini vs GPT-4.1
- o3 Mini vs Kimi K2 0711
- o3 Mini vs Qwen3 235B A22B Thinking 2507
- o3 Mini vs o1-pro
- o3 Mini vs Sonar Reasoning Pro
- o3 Mini vs o3 Mini High
- o3 Mini vs GPT-4.1 Mini
- o3 Mini vs GPT-4o (2024-11-20)
Our take
gpt-oss-120b is 7.3x cheaper for a typical chat. o3 Mini scores higher on the Artificial Analysis Intelligence Index (12.5 vs 11.6). o3 Mini has the larger context window (200K vs 131K tokens). The right pick depends on your workload, so the quickest way to settle it is to send the same prompt to both and compare.
FAQ
Frequently asked questions
Is gpt-oss-120b or o3 Mini cheaper?
gpt-oss-120b is cheaper for a typical chat (2K input tokens and 500 output tokens). gpt-oss-120b costs $0.15 per 1M input tokens and $0.60 per 1M output tokens, while o3 Mini costs $1.10 per 1M input tokens and $4.40 per 1M output tokens.
Which has a bigger context window, gpt-oss-120b or o3 Mini?
o3 Mini supports up to 200K tokens of context, compared with 131K for gpt-oss-120b.
Is gpt-oss-120b smarter than o3 Mini?
On the Artificial Analysis Intelligence Index, gpt-oss-120b scores 11.6 and o3 Mini scores 12.5, putting o3 Mini ahead. Benchmarks don't capture everything, so the best test is running your own prompts through both.
Can I use gpt-oss-120b and o3 Mini at the same time?
Yes. Shortcut Chat sends one prompt to multiple models at once, so you can see gpt-oss-120b and o3 Mini answer side by side and keep the better response.
Why choose? Ask both.
Send one prompt to gpt-oss-120b and o3 Mini at the same time. Compare the answers side by side and keep the best one.