Model Comparison

GPT OSS 120B vs GPT OSS 20B

GPT OSS 120B significantly outperforms across most benchmarks. GPT OSS 20B is 2.1x cheaper per token.

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Performance Benchmarks

Comparative analysis across standard metrics

7 benchmarks

GPT OSS 120B outperforms in 7 benchmarks (CodeForces, GPQA, HealthBench, HealthBench Hard, Humanity's Last Exam, MMLU, TAU-bench Retail), while GPT OSS 20B is better at 0 benchmarks.

GPT OSS 120B significantly outperforms across most benchmarks.

Sun May 24 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

GPT OSS 20B costs less

For input processing, GPT OSS 120B ($0.09/1M tokens) is 1.8x more expensive than GPT OSS 20B ($0.05/1M tokens).

For output processing, GPT OSS 120B ($0.45/1M tokens) is 2.3x more expensive than GPT OSS 20B ($0.20/1M tokens).

In conclusion, GPT OSS 120B is more expensive than GPT OSS 20B.*

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

Lowest available price from all providers
Sun May 24 2026 • llm-stats.com
OpenAI
GPT OSS 120B
Input tokens$0.09
Output tokens$0.45
Best providerDeepinfra
OpenAI
GPT OSS 20B
Input tokens$0.05
Output tokens$0.20
Best providerNovita
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Model Size

Parameter count comparison

95.9B diff

GPT OSS 120B has 95.9B more parameters than GPT OSS 20B, making it 458.9% larger.

OpenAI
GPT OSS 120B
116.8Bparameters
OpenAI
GPT OSS 20B
20.9Bparameters
116.8B
GPT OSS 120B
20.9B
GPT OSS 20B

Context Window

Maximum input and output token capacity

Both models have the same input context window of 131,072 tokens. GPT OSS 120B can generate longer responses up to 131,072 tokens, while GPT OSS 20B is limited to 32,768 tokens.

OpenAI
GPT OSS 120B
Input131,072 tokens
Output131,072 tokens
OpenAI
GPT OSS 20B
Input131,072 tokens
Output32,768 tokens
Sun May 24 2026 • llm-stats.com

License

Usage and distribution terms

Both models are licensed under Apache 2.0.

Both models share the same licensing terms, providing consistent usage rights.

GPT OSS 120B

Apache 2.0

Open weights

GPT OSS 20B

Apache 2.0

Open weights

Release Timeline

When each model was launched

Both models were released on 2025-08-05.

They likely represent similar generations of model development.

GPT OSS 120B

Aug 5, 2025

9 months ago

GPT OSS 20B

Aug 5, 2025

9 months ago

Knowledge Cutoff

When training data ends

Neither model specifies a knowledge cutoff date.

Unable to compare the recency of their training data.

No cutoff dates available

Provider Availability

GPT OSS 120B is available from DeepInfra, Novita, OpenAI, Fireworks, Groq. GPT OSS 20B is available from Novita, Fireworks, Groq, OpenAI.

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

GPT OSS 20B

novita logo
Novita
Input Price:Input: $0.05/1MOutput Price:Output: $0.20/1M
fireworks logo
Fireworks
Input Price:Input: $0.10/1MOutput Price:Output: $0.50/1M
groq logo
Groq
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
* Prices shown are per million tokens

Outputs Comparison

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Key Takeaways

OpenAI
Higher CodeForces score (82.1% vs 74.3%)
Higher GPQA score (80.1% vs 71.5%)
Higher HealthBench score (57.6% vs 42.5%)
Higher HealthBench Hard score (30.0% vs 10.8%)
Higher Humanity's Last Exam score (14.9% vs 10.9%)
Higher MMLU score (90.0% vs 85.3%)
Higher TAU-bench Retail score (67.8% vs 54.8%)
OpenAI
Less expensive input tokens
Less expensive output tokens

Detailed Comparison

AI Model Comparison Table
Feature
OpenAI
GPT OSS 120B
OpenAI
GPT OSS 20B

FAQ

Common questions about GPT OSS 120B vs GPT OSS 20B.

Which is better, GPT OSS 120B or GPT OSS 20B?

GPT OSS 120B significantly outperforms across most benchmarks. GPT OSS 120B is made by OpenAI and GPT OSS 20B is made by OpenAI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does GPT OSS 120B compare to GPT OSS 20B in benchmarks?

GPT OSS 120B scores MMLU: 90.0%, CodeForces: 82.1%, GPQA: 80.1%, TAU-bench Retail: 67.8%, HealthBench: 57.6%. GPT OSS 20B scores MMLU: 85.3%, CodeForces: 74.3%, GPQA: 71.5%, TAU-bench Retail: 54.8%, HealthBench: 42.5%.

Is GPT OSS 120B cheaper than GPT OSS 20B?

GPT OSS 20B is 1.8x cheaper for input tokens. GPT OSS 120B costs $0.09/M input and $0.45/M output via deepinfra. GPT OSS 20B costs $0.05/M input and $0.20/M output via novita.

What are the context window sizes for GPT OSS 120B and GPT OSS 20B?

GPT OSS 120B supports 131K tokens and GPT OSS 20B 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 OSS 120B and GPT OSS 20B?

Key differences include input pricing ($0.09 vs $0.05/M). See the full comparison above for benchmark-by-benchmark results.