Model Comparison

GPT OSS 120B vs Grok-2

GPT OSS 120B significantly outperforms across most benchmarks. GPT OSS 120B is 22.2x cheaper per token.

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Performance Benchmarks

Comparative analysis across standard metrics

2 benchmarks

GPT OSS 120B outperforms in 2 benchmarks (GPQA, MMLU), while Grok-2 is better at 0 benchmarks.

GPT OSS 120B significantly outperforms across most benchmarks.

Tue May 26 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 22.2x cheaper than Grok-2 ($2.00/1M tokens).

For output processing, GPT OSS 120B ($0.45/1M tokens) is 22.2x cheaper than Grok-2 ($10.00/1M tokens).

In conclusion, Grok-2 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 26 2026 • llm-stats.com

GPT OSS 120B

Input tokens$0.09

Output tokens$0.45

Best providerDeepinfra

Grok-2

Input tokens$2.00

Output tokens$10.00

Best providerxAI

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Context Window

Maximum input and output token capacity

GPT OSS 120B accepts 131,072 input tokens compared to Grok-2's 128,000 tokens. GPT OSS 120B can generate longer responses up to 131,072 tokens, while Grok-2 is limited to 8,000 tokens.

GPT OSS 120B

Input131,072 tokens

Output131,072 tokens

Grok-2

Input128,000 tokens

Output8,000 tokens

Tue May 26 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Grok-2 supports multimodal inputs, whereas GPT OSS 120B does not.

Grok-2 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-2

Text

Images

Audio

Video

License

Usage and distribution terms

GPT OSS 120B is licensed under Apache 2.0, while Grok-2 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-2

Proprietary

Closed source

Release Timeline

When each model was launched

GPT OSS 120B was released on 2025-08-05, while Grok-2 was released on 2024-08-13.

GPT OSS 120B is 12 months newer than Grok-2.

GPT OSS 120B

Aug 5, 2025

9 months ago

11mo newer

Grok-2

Aug 13, 2024

1.8 years 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. Grok-2 is available from xAI.

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

Grok-2

xAI

Input Price:Input: $2.00/1MOutput Price:Output: $10.00/1M

* Prices shown are per million tokens

Outputs Comparison

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Key Takeaways

GPT OSS 120B

View details

OpenAI

Larger context window (131,072 tokens)

Less expensive input tokens

Less expensive output tokens

Has open weights

Higher GPQA score (80.1% vs 56.0%)

Higher MMLU score (90.0% vs 87.5%)

Grok-2

View details

xAI

Supports multimodal inputs

Detailed Comparison

AI Model Comparison Table
Feature	GPT OSS 120B	Grok-2

FAQ

Common questions about GPT OSS 120B vs Grok-2.

Which is better, GPT OSS 120B or Grok-2?

GPT OSS 120B significantly outperforms across most benchmarks. GPT OSS 120B is made by OpenAI and Grok-2 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-2 in benchmarks?

GPT OSS 120B scores MMLU: 90.0%, CodeForces: 82.1%, GPQA: 80.1%, TAU-bench Retail: 67.8%, HealthBench: 57.6%. Grok-2 scores DocVQA: 93.6%, HumanEval: 88.4%, MMLU: 87.5%, MATH: 76.1%, MMLU-Pro: 75.5%.

Is GPT OSS 120B cheaper than Grok-2?

GPT OSS 120B is 22.2x cheaper for input tokens. GPT OSS 120B costs $0.09/M input and $0.45/M output via deepinfra. Grok-2 costs $2.00/M input and $10.00/M output via xai.

What are the context window sizes for GPT OSS 120B and Grok-2?

GPT OSS 120B supports 131K tokens and Grok-2 supports 128K 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-2?

Key differences include context window (131K vs 128K), input pricing ($0.09 vs $2.00/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-2?

GPT OSS 120B is developed by OpenAI and Grok-2 is developed by xAI.