Model Comparison

GPT-5 vs GPT OSS 120BWhich is better in 2026?

GPT-5 shows notably better performance in the majority of benchmarks. GPT OSS 120B is 19.1x cheaper per token.

Verdict: GPT-5 vs GPT OSS 120B — which is better?

GPT-5 (by OpenAI) and GPT OSS 120B (by OpenAI) are two of the AI models people compare most. Here is how they stack up on benchmarks, price and capabilities, and which one to pick in 2026.

GPT-5 outperforms in 3 benchmarks (GPQA, Humanity's Last Exam, MMLU), while GPT OSS 120B is better at 1 benchmark (HealthBench Hard). GPT-5 shows notably better performance in the majority of benchmarks.

On price, GPT OSS 120B is roughly 19.1x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

GPT-5 also accepts a larger context window (400,000 input tokens), making it the stronger choice for long documents and large codebases.

Choose GPT-5 if…

  • you want the strongest raw capability — it leads on 3 of 4 shared benchmarks
  • you process long inputs — it offers a 400,000 token context window
  • you want the most recent training data — it shipped Aug 2025

Choose GPT OSS 120B if…

  • cost matters — it's about 19.1x cheaper per token
  • you need open weights you can self-host or fine-tune
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Performance Benchmarks

Comparative analysis across standard metrics

4 benchmarks

GPT-5 outperforms in 3 benchmarks (GPQA, Humanity's Last Exam, MMLU), while GPT OSS 120B is better at 1 benchmark (HealthBench Hard).

GPT-5 shows notably better performance in the majority of benchmarks.

Thu Jun 25 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 ($1.25/1M tokens) is 13.9x more expensive than GPT OSS 120B ($0.09/1M tokens).

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

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

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

Lowest available price from all providers
Thu Jun 25 2026 • llm-stats.com
OpenAI
GPT-5
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 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 is limited to 128,000 tokens.

OpenAI
GPT-5
Input400,000 tokens
Output128,000 tokens
OpenAI
GPT OSS 120B
Input131,072 tokens
Output131,072 tokens
Thu Jun 25 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

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

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

GPT-5

Text
Images
Audio
Video

GPT OSS 120B

Text
Images
Audio
Video

License

Usage and distribution terms

GPT-5 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

Proprietary

Closed source

GPT OSS 120B

Apache 2.0

Open weights

Release Timeline

When each model was launched

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

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

GPT-5

Aug 7, 2025

10 months ago

2d newer
GPT OSS 120B

Aug 5, 2025

10 months ago

Knowledge Cutoff

When training data ends

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

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

GPT-5

Sep 2024

GPT OSS 120B

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Provider Availability

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

GPT-5

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 (85.7% vs 80.1%)
Higher Humanity's Last Exam score (24.8% vs 14.9%)
Higher MMLU score (92.5% vs 90.0%)
OpenAI
Less expensive input tokens
Less expensive output tokens
Has open weights
Higher HealthBench Hard score (30.0% vs 1.6%)

Detailed Comparison

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

FAQ

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

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

GPT-5 shows notably better performance in the majority of benchmarks. GPT-5 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 compare to GPT OSS 120B in benchmarks?

GPT-5 scores SWE-Lancer (IC-Diamond subset): 100.0%, COLLIE: 99.0%, Tau2 Telecom: 96.7%, OpenAI-MRCR: 2 needle 128k: 95.2%, AIME 2025: 94.6%. GPT OSS 120B scores MMLU: 90.0%, CodeForces: 82.1%, GPQA: 80.1%, TAU-bench Retail: 67.8%, HealthBench: 57.6%.

Is GPT-5 cheaper than GPT OSS 120B?

GPT OSS 120B is 13.9x cheaper for input tokens. GPT-5 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 and GPT OSS 120B?

GPT-5 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 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.

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