Model Comparison

o3-mini vs GPT OSS 120B

GPT OSS 120B significantly outperforms across most benchmarks. GPT OSS 120B is 10.7x cheaper per token.

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Performance Benchmarks

Comparative analysis across standard metrics

3 benchmarks

o3-mini outperforms in 0 benchmarks, while GPT OSS 120B is better at 3 benchmarks (GPQA, MMLU, TAU-bench Retail).

GPT OSS 120B significantly outperforms across most benchmarks.

Fri May 15 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

GPT OSS 120B costs less

For input processing, o3-mini ($1.10/1M tokens) is 12.2x more expensive than GPT OSS 120B ($0.09/1M tokens).

For output processing, o3-mini ($4.40/1M tokens) is 9.8x more expensive than GPT OSS 120B ($0.45/1M tokens).

In conclusion, o3-mini is more expensive than GPT OSS 120B.*

* Using a 3:1 ratio of input to output tokens

Lowest available price from all providers

Fri May 15 2026 • llm-stats.com

o3-mini

Input tokens$1.10

Output tokens$4.40

Best providerAzure

GPT OSS 120B

Input tokens$0.09

Output tokens$0.45

Best providerDeepinfra

Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

o3-mini accepts 200,000 input tokens compared to GPT OSS 120B's 131,072 tokens. GPT OSS 120B can generate longer responses up to 131,072 tokens, while o3-mini is limited to 100,000 tokens.

o3-mini

Input200,000 tokens

Output100,000 tokens

GPT OSS 120B

Input131,072 tokens

Output131,072 tokens

Fri May 15 2026 • llm-stats.com

License

Usage and distribution terms

o3-mini is licensed under a proprietary license, while GPT OSS 120B uses Apache 2.0.

License differences may affect how you can use these models in commercial or open-source projects.

o3-mini

Proprietary

Closed source

GPT OSS 120B

Apache 2.0

Open weights

Release Timeline

When each model was launched

o3-mini was released on 2025-01-30, while GPT OSS 120B was released on 2025-08-05.

GPT OSS 120B is 6 months newer than o3-mini.

o3-mini

Jan 30, 2025

1.3 years ago

GPT OSS 120B

Aug 5, 2025

9 months ago

6mo newer

Knowledge Cutoff

When training data ends

o3-mini has a documented knowledge cutoff of 2023-09-30, while GPT OSS 120B's cutoff date is not specified.

We can confirm o3-mini's training data extends to 2023-09-30, but cannot make a direct comparison without GPT OSS 120B's cutoff date.

o3-mini

Sep 2023

GPT OSS 120B

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Provider Availability

o3-mini is available from Azure, OpenAI. GPT OSS 120B is available from DeepInfra, Novita, OpenAI, Fireworks, Groq.

o3-mini

Azure

Input Price:Input: $1.10/1MOutput Price:Output: $4.40/1M

OpenAI

Input Price:Input: $1.10/1MOutput Price:Output: $4.40/1M

GPT OSS 120B

Deepinfra

Input Price:Input: $0.09/1MOutput Price:Output: $0.45/1M

Novita

Input Price:Input: $0.10/1MOutput Price:Output: $0.50/1M

OpenAI

Input Price:Input: $0.10/1MOutput Price:Output: $0.50/1M

Fireworks

Input Price:Input: $0.15/1MOutput Price:Output: $0.60/1M

Groq

Input Price:Input: $0.15/1MOutput Price:Output: $0.60/1M

* Prices shown are per million tokens

Outputs Comparison

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Key Takeaways

o3-mini

View details

OpenAI

Larger context window (200,000 tokens)

GPT OSS 120B

View details

OpenAI

Less expensive input tokens

Less expensive output tokens

Has open weights

Higher GPQA score (80.1% vs 77.2%)

Higher MMLU score (90.0% vs 86.9%)

Higher TAU-bench Retail score (67.8% vs 57.6%)

Detailed Comparison

AI Model Comparison Table
Feature	o3-mini	GPT OSS 120B

FAQ

Common questions about o3-mini vs GPT OSS 120B.

Which is better, o3-mini or GPT OSS 120B?

GPT OSS 120B significantly outperforms across most benchmarks. o3-mini is made by OpenAI and GPT OSS 120B is made by OpenAI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does o3-mini compare to GPT OSS 120B in benchmarks?

o3-mini scores COLLIE: 98.7%, MATH: 97.9%, IFEval: 93.9%, MGSM: 92.0%, AIME 2024: 87.3%. GPT OSS 120B scores MMLU: 90.0%, CodeForces: 82.1%, GPQA: 80.1%, TAU-bench Retail: 67.8%, HealthBench: 57.6%.

Is o3-mini cheaper than GPT OSS 120B?

GPT OSS 120B is 12.2x cheaper for input tokens. o3-mini costs $1.10/M input and $4.40/M output via azure. GPT OSS 120B costs $0.09/M input and $0.45/M output via deepinfra.

What are the context window sizes for o3-mini and GPT OSS 120B?

o3-mini supports 200K tokens and GPT OSS 120B supports 131K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between o3-mini and GPT OSS 120B?

Key differences include context window (200K vs 131K), input pricing ($1.10 vs $0.09/M), licensing (Proprietary vs Apache 2.0). See the full comparison above for benchmark-by-benchmark results.