Model Comparison

GPT-5 Medium vs GPT OSS 120B

GPT-5 Medium significantly outperforms across most benchmarks. GPT OSS 120B is 19.1x cheaper per token.

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Performance Benchmarks

Comparative analysis across standard metrics

1 benchmarks

GPT-5 Medium outperforms in 1 benchmarks (GPQA), while GPT OSS 120B is better at 0 benchmarks.

GPT-5 Medium significantly outperforms across most benchmarks.

Tue May 05 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

GPT OSS 120B costs less

For input processing, GPT-5 Medium ($1.25/1M tokens) is 13.9x more expensive than GPT OSS 120B ($0.09/1M tokens).

For output processing, GPT-5 Medium ($10.00/1M tokens) is 22.2x more expensive than GPT OSS 120B ($0.45/1M tokens).

In conclusion, GPT-5 Medium is more expensive than GPT OSS 120B.*

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

Lowest available price from all providers
Tue May 05 2026 • llm-stats.com
OpenAI
GPT-5 Medium
Input tokens$1.25
Output tokens$10.00
Best providerOpenAI
OpenAI
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

GPT-5 Medium accepts 400,000 input tokens compared to GPT OSS 120B's 131,072 tokens. GPT OSS 120B can generate longer responses up to 131,072 tokens, while GPT-5 Medium is limited to 128,000 tokens.

OpenAI
GPT-5 Medium
Input400,000 tokens
Output128,000 tokens
OpenAI
GPT OSS 120B
Input131,072 tokens
Output131,072 tokens
Tue May 05 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

GPT-5 Medium supports multimodal inputs, whereas GPT OSS 120B does not.

GPT-5 Medium can handle both text and other forms of data like images, making it suitable for multimodal applications.

GPT-5 Medium

Text
Images
Audio
Video

GPT OSS 120B

Text
Images
Audio
Video

License

Usage and distribution terms

GPT-5 Medium 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.

GPT-5 Medium

Proprietary

Closed source

GPT OSS 120B

Apache 2.0

Open weights

Release Timeline

When each model was launched

GPT-5 Medium was released on 2025-08-07, while GPT OSS 120B was released on 2025-08-05.

GPT-5 Medium is 0 month newer than GPT OSS 120B.

GPT-5 Medium

Aug 7, 2025

9 months ago

2d newer
GPT OSS 120B

Aug 5, 2025

9 months ago

Knowledge Cutoff

When training data ends

GPT-5 Medium has a documented knowledge cutoff of 2024-09-30, while GPT OSS 120B's cutoff date is not specified.

We can confirm GPT-5 Medium's training data extends to 2024-09-30, but cannot make a direct comparison without GPT OSS 120B's cutoff date.

GPT-5 Medium

Sep 2024

GPT OSS 120B

—

Provider Availability

GPT-5 Medium is available from OpenAI. GPT OSS 120B is available from DeepInfra, Novita, OpenAI, Fireworks, Groq.

GPT-5 Medium

openai logo
OpenAI
Input Price:Input: $1.25/1MOutput Price:Output: $10.00/1M

GPT OSS 120B

deepinfra logo
Deepinfra
Input Price:Input: $0.09/1MOutput Price:Output: $0.45/1M
novita logo
Novita
Input Price:Input: $0.10/1MOutput Price:Output: $0.50/1M
openai logo
OpenAI
Input Price:Input: $0.10/1MOutput Price:Output: $0.50/1M
fireworks logo
Fireworks
Input Price:Input: $0.15/1MOutput Price:Output: $0.60/1M
groq logo
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

OpenAI
Larger context window (400,000 tokens)
Supports multimodal inputs
Higher GPQA score (88.1% vs 80.1%)
OpenAI
Less expensive input tokens
Less expensive output tokens
Has open weights

Detailed Comparison

AI Model Comparison Table
Feature
OpenAI
GPT-5 Medium
OpenAI
GPT OSS 120B

FAQ

Common questions about GPT-5 Medium vs GPT OSS 120B.

Which is better, GPT-5 Medium or GPT OSS 120B?

GPT-5 Medium significantly outperforms across most benchmarks. GPT-5 Medium 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 GPT-5 Medium compare to GPT OSS 120B in benchmarks?

GPT-5 Medium scores AIME 2025: 88.9%, GPQA: 88.1%. GPT OSS 120B scores MMLU: 90.0%, CodeForces: 82.1%, GPQA: 80.1%, TAU-bench Retail: 67.8%, HealthBench: 57.6%.

Is GPT-5 Medium cheaper than GPT OSS 120B?

GPT OSS 120B is 13.9x cheaper for input tokens. GPT-5 Medium costs $1.25/M input and $10.00/M output via openai. GPT OSS 120B costs $0.09/M input and $0.45/M output via deepinfra.

What are the context window sizes for GPT-5 Medium and GPT OSS 120B?

GPT-5 Medium supports 400K 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 GPT-5 Medium and GPT OSS 120B?

Key differences include context window (400K vs 131K), input pricing ($1.25 vs $0.09/M), multimodal support (yes vs no), licensing (Proprietary vs Apache 2.0). See the full comparison above for benchmark-by-benchmark results.