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GPT OSS 20B vs Grok 4 Fast
Comprehensive side-by-side LLM comparison
Grok 4 Fast leads with 14.2% higher average benchmark score. Grok 4 Fast offers 1.8M more tokens in context window than GPT OSS 20B. Both models have similar pricing. Grok 4 Fast supports multimodal inputs. GPT OSS 20B is available on 4 providers. Overall, Grok 4 Fast is the stronger choice for coding tasks.
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OpenAI
GPT-OSS 20B was created as a smaller open-source variant, designed to balance capability with accessibility for researchers and developers. Built with 20 billion parameters, it provides a more approachable entry point for those seeking to work with open-source language models while benefiting from OpenAI's architectural insights.
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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 20B
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 20B
Input:$0.05
Output:$0.20($0.45 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 20B
Average Score:71.5%
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Grok 4 Fast
Average Score:85.7%(+14.2%)
Provider Availability & Performance
Available providers and their performance metrics
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GPT OSS 20B
4 providers
Groq
Throughput: 1000 tok/s
Latency: 0.38ms
Novita
OpenAI
Throughput: 115 tok/s
Latency: 5.2ms
ZeroEval
Throughput: 1000 tok/s
Latency: 0.38ms
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GPT OSS 20B
Avg Score:71.5%
Providers:4
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Grok 4 Fast
Avg Score:85.7%(+14.2%)
Providers:1