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GPT OSS 120B vs Grok 4 Fast
Comprehensive side-by-side LLM comparison
Grok 4 Fast leads with 5.6% higher average benchmark score. Grok 4 Fast offers 1.8M more tokens in context window than GPT OSS 120B. Both models have similar pricing. Grok 4 Fast supports multimodal inputs. GPT OSS 120B is available on 5 providers. Overall, Grok 4 Fast is the stronger choice for coding tasks.
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OpenAI
GPT-OSS 120B was developed as an open-source model release from OpenAI, designed to provide the research and developer community with access to a capable language model. Built with 120 billion parameters, it enables experimentation, fine-tuning, and deployment in contexts where open-source licensing and transparency are valued.
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xAI
Grok 4 Fast is a multimodal language model developed by xAI. It achieves strong performance with an average score of 73.0% across 7 benchmarks. It excels particularly in SimpleQA (95.0%), HMMT 2025 (93.3%), AIME 2025 (92.0%). With a 2.0M token context window, it can handle extensive documents and complex multi-turn conversations. The model is available through 1 API provider. As a multimodal model, it can process and understand text, images, and other input formats seamlessly. Released in 2025, it represents xAI's latest advancement in AI technology.
23 days newer
GPT OSS 120B
OpenAI
2025-08-05
Grok 4 Fast
xAI
2025-08-28
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Pricing Comparison
Cost per million tokens (USD)
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GPT OSS 120B
Input:$0.09
Output:$0.45($0.16 cheaper)
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Grok 4 Fast
Input:$0.20
Output:$0.50
Performance Metrics
Context window and performance specifications
Average performance across 1 common benchmarks
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GPT OSS 120B
Average Score:80.1%
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Grok 4 Fast
Average Score:85.7%(+5.6%)
Provider Availability & Performance
Available providers and their performance metrics
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GPT OSS 120B
5 providers
DeepInfra
Groq
Throughput: 500 tok/s
Latency: 0.5ms
Novita
OpenAI
Throughput: 115 tok/s
Latency: 5.2ms
ZeroEval
Throughput: 500 tok/s
Latency: 0.5ms
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GPT OSS 120B
Avg Score:80.1%
Providers:5
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Grok 4 Fast
Avg Score:85.7%(+5.6%)
Providers:1