Model Comparison

GPT OSS 120B vs Grok-4

Grok-4 significantly outperforms across most benchmarks. GPT OSS 120B is 33.3x cheaper per token.

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Performance Benchmarks

Comparative analysis across standard metrics

2 benchmarks

GPT OSS 120B outperforms in 0 benchmarks, while Grok-4 is better at 2 benchmarks (GPQA, Humanity's Last Exam).

Grok-4 significantly outperforms across most benchmarks.

Mon Jun 01 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 OSS 120B ($0.09/1M tokens) is 33.3x cheaper than Grok-4 ($3.00/1M tokens).

For output processing, GPT OSS 120B ($0.45/1M tokens) is 33.3x cheaper than Grok-4 ($15.00/1M tokens).

In conclusion, Grok-4 is more expensive than GPT OSS 120B.*

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

Lowest available price from all providers
Mon Jun 01 2026 • llm-stats.com
OpenAI
GPT OSS 120B
Input tokens$0.09
Output tokens$0.45
Best providerDeepinfra
xAI
Grok-4
Input tokens$3.00
Output tokens$15.00
Best providerxAI
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

Grok-4 accepts 256,000 input tokens compared to GPT OSS 120B's 131,072 tokens. GPT OSS 120B can generate longer responses up to 131,072 tokens, while Grok-4 is limited to 8,000 tokens.

OpenAI
GPT OSS 120B
Input131,072 tokens
Output131,072 tokens
xAI
Grok-4
Input256,000 tokens
Output8,000 tokens
Mon Jun 01 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Grok-4 supports multimodal inputs, whereas GPT OSS 120B does not.

Grok-4 can handle both text and other forms of data like images, making it suitable for multimodal applications.

GPT OSS 120B

Text
Images
Audio
Video

Grok-4

Text
Images
Audio
Video

License

Usage and distribution terms

GPT OSS 120B is licensed under Apache 2.0, while Grok-4 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

Grok-4

Proprietary

Closed source

Release Timeline

When each model was launched

GPT OSS 120B was released on 2025-08-05, while Grok-4 was released on 2025-07-09.

GPT OSS 120B is 1 month newer than Grok-4.

GPT OSS 120B

Aug 5, 2025

10 months ago

3w newer
Grok-4

Jul 9, 2025

10 months ago

Knowledge Cutoff

When training data ends

Grok-4 has a documented knowledge cutoff of 2024-12-31, while GPT OSS 120B's cutoff date is not specified.

We can confirm Grok-4's training data extends to 2024-12-31, but cannot make a direct comparison without GPT OSS 120B's cutoff date.

GPT OSS 120B

—

Grok-4

Dec 2024

Provider Availability

GPT OSS 120B is available from DeepInfra, Novita, OpenAI, Fireworks, Groq. Grok-4 is available from xAI.

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

Grok-4

xai logo
xAI
Input Price:Input: $3.00/1MOutput Price:Output: $15.00/1M
* Prices shown are per million tokens

Outputs Comparison

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Key Takeaways

OpenAI
Less expensive input tokens
Less expensive output tokens
Has open weights
xAI
Larger context window (256,000 tokens)
Supports multimodal inputs
Higher GPQA score (87.5% vs 80.1%)
Higher Humanity's Last Exam score (40.0% vs 14.9%)
OpenAIGPT OSS 120B
xAIGrok-4
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Detailed Comparison

AI Model Comparison Table
Feature
OpenAI
GPT OSS 120B
xAI
Grok-4

FAQ

Common questions about GPT OSS 120B vs Grok-4.

Which is better, GPT OSS 120B or Grok-4?

Grok-4 significantly outperforms across most benchmarks. GPT OSS 120B is made by OpenAI and Grok-4 is made by xAI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does GPT OSS 120B compare to Grok-4 in benchmarks?

GPT OSS 120B scores MMLU: 90.0%, CodeForces: 82.1%, GPQA: 80.1%, TAU-bench Retail: 67.8%, HealthBench: 57.6%. Grok-4 scores AIME 2025: 91.7%, HMMT25: 90.0%, GPQA: 87.5%, LiveCodeBench: 79.0%, Humanity's Last Exam: 40.0%.

Is GPT OSS 120B cheaper than Grok-4?

GPT OSS 120B is 33.3x cheaper for input tokens. GPT OSS 120B costs $0.09/M input and $0.45/M output via deepinfra. Grok-4 costs $3.00/M input and $15.00/M output via xai.

What are the context window sizes for GPT OSS 120B and Grok-4?

GPT OSS 120B supports 131K tokens and Grok-4 supports 256K 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 Grok-4?

Key differences include context window (131K vs 256K), input pricing ($0.09 vs $3.00/M), multimodal support (no vs yes), licensing (Apache 2.0 vs Proprietary). See the full comparison above for benchmark-by-benchmark results.

Who makes GPT OSS 120B and Grok-4?

GPT OSS 120B is developed by OpenAI and Grok-4 is developed by xAI.