Model Comparison

GPT OSS 120B vs o3-pro

Comparing GPT OSS 120B and o3-pro across benchmarks, pricing, and capabilities.

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Performance Benchmarks

Comparative analysis across standard metrics

No common benchmarks found

GPT OSS 120B and o3-pro don't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

GPT OSS 120B costs less

For input processing, GPT OSS 120B ($0.09/1M tokens) is 222.2x cheaper than o3-pro ($20.00/1M tokens).

For output processing, GPT OSS 120B ($0.45/1M tokens) is 177.8x cheaper than o3-pro ($80.00/1M tokens).

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

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

Lowest available price from all providers

Mon May 25 2026 • llm-stats.com

GPT OSS 120B

Input tokens$0.09

Output tokens$0.45

Best providerDeepinfra

o3-pro

Input tokens$20.00

Output tokens$80.00

Best providerOpenAI

Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

o3-pro 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-pro is limited to 100,000 tokens.

GPT OSS 120B

Input131,072 tokens

Output131,072 tokens

o3-pro

Input200,000 tokens

Output100,000 tokens

Mon May 25 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

o3-pro supports multimodal inputs, whereas GPT OSS 120B does not.

o3-pro can handle both text and other forms of data like images, making it suitable for multimodal applications.

GPT OSS 120B

Text

Images

Audio

Video

o3-pro

Text

Images

Audio

Video

License

Usage and distribution terms

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

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

GPT OSS 120B

Apache 2.0

Open weights

o3-pro

Proprietary

Closed source

Release Timeline

When each model was launched

GPT OSS 120B was released on 2025-08-05, while o3-pro was released on 2025-06-10.

GPT OSS 120B is 2 months newer than o3-pro.

GPT OSS 120B

Aug 5, 2025

9 months ago

1mo newer

o3-pro

Jun 10, 2025

11 months ago

Knowledge Cutoff

When training data ends

o3-pro has a documented knowledge cutoff of 2024-05-31, while GPT OSS 120B's cutoff date is not specified.

We can confirm o3-pro's training data extends to 2024-05-31, but cannot make a direct comparison without GPT OSS 120B's cutoff date.

GPT OSS 120B

—

o3-pro

May 2024

Provider Availability

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

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

o3-pro

OpenAI

Input Price:Input: $20.00/1MOutput Price:Output: $80.00/1M

* Prices shown are per million tokens

Outputs Comparison

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Key Takeaways

GPT OSS 120B

View details

OpenAI

Less expensive input tokens

Less expensive output tokens

Has open weights

o3-pro

View details

OpenAI

Larger context window (200,000 tokens)

Supports multimodal inputs

Detailed Comparison

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

FAQ

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

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

GPT OSS 120B (OpenAI) and o3-pro (OpenAI) each have strengths in different areas. Compare their benchmark scores, pricing, context windows, and capabilities above to determine which fits your needs.

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

GPT OSS 120B scores MMLU: 90.0%, CodeForces: 82.1%, GPQA: 80.1%, TAU-bench Retail: 67.8%, HealthBench: 57.6%.

Is GPT OSS 120B cheaper than o3-pro?

GPT OSS 120B is 222.2x cheaper for input tokens. GPT OSS 120B costs $0.09/M input and $0.45/M output via deepinfra. o3-pro costs $20.00/M input and $80.00/M output via openai.

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

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

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

Key differences include context window (131K vs 200K), input pricing ($0.09 vs $20.00/M), multimodal support (no vs yes), licensing (Apache 2.0 vs Proprietary). See the full comparison above for benchmark-by-benchmark results.