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Grok 4 Fast vs o4-mini
Comprehensive side-by-side LLM comparison
o4-mini leads with 1.0% higher average benchmark score. Grok 4 Fast offers 1.7M more tokens in context window than o4-mini. Grok 4 Fast is $4.80 cheaper per million tokens. Both models have their strengths depending on your specific coding needs.
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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.
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OpenAI
o4-mini was created as part of the next generation of OpenAI's reasoning models, designed to continue advancing the balance between analytical capability and operational efficiency. Built to bring cutting-edge reasoning techniques to applications requiring quick turnaround, it represents the evolution of compact reasoning-focused models.
4 months newer
o4-mini
OpenAI
2025-04-16
Grok 4 Fast
xAI
2025-08-28
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Pricing Comparison
Cost per million tokens (USD)
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Grok 4 Fast
Input:$0.20
Output:$0.50($4.80 cheaper)
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o4-mini
Input:$1.10
Output:$4.40
Performance Metrics
Context window and performance specifications
Average performance across 3 common benchmarks
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Grok 4 Fast
Average Score:74.2%
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o4-mini
Average Score:75.2%(+1.0%)
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Knowledge Cutoff
Training data recency comparison
o4-mini
2024-05-31
More recent knowledge cutoff means awareness of newer technologies and frameworks
Provider Availability & Performance
Available providers and their performance metrics
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Grok 4 Fast
1 providers
xAI
Throughput: 90 tok/s
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o4-mini
1 providers
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Grok 4 Fast
Avg Score:74.2%
Providers:1
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o4-mini
Avg Score:75.2%(+1.0%)
Providers:1