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GPT-5 vs Grok 4 Fast
Comprehensive side-by-side LLM comparison
GPT-5 leads with 3.1% higher average benchmark score. Grok 4 Fast offers 1.5M more tokens in context window than GPT-5. Grok 4 Fast is $10.55 cheaper per million tokens. Both models have their strengths depending on your specific coding needs.
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OpenAI
GPT-5 represents the next generation of OpenAI's foundational models, developed to advance the frontier of AI capabilities in reasoning, knowledge, and general intelligence. Built to push beyond the limitations of GPT-4, it incorporates architectural and training improvements designed to enhance performance across diverse tasks and domains.
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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.
21 days newer
GPT-5
OpenAI
2025-08-07
Grok 4 Fast
xAI
2025-08-28
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Pricing Comparison
Cost per million tokens (USD)
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GPT-5
Input:$1.25
Output:$10.00
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Grok 4 Fast
Input:$0.20
Output:$0.50($10.55 cheaper)
Performance Metrics
Context window and performance specifications
Average performance across 4 common benchmarks
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GPT-5
Average Score:82.1%(+3.1%)
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Grok 4 Fast
Average Score:79.0%
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Knowledge Cutoff
Training data recency comparison
GPT-5
2024-09-30
More recent knowledge cutoff means awareness of newer technologies and frameworks
Provider Availability & Performance
Available providers and their performance metrics
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GPT-5
2 providers
OpenAI
Throughput: 100 tok/s
Latency: 2ms
ZeroEval
Throughput: 100 tok/s
Latency: 2ms
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GPT-5
Avg Score:82.1%(+3.1%)
Providers:2
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Grok 4 Fast
Avg Score:79.0%
Providers:1