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Gemini 1.5 Flash vs Grok 4 Fast
Comprehensive side-by-side LLM comparison
Grok 4 Fast leads with 34.7% higher average benchmark score. Grok 4 Fast offers 973.2K more tokens in context window than Gemini 1.5 Flash. Both models have similar pricing. Overall, Grok 4 Fast is the stronger choice for coding tasks.
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Gemini 1.5 Flash was created as a fast and efficient multimodal model, designed to provide quick responses while handling text, images, and other modalities. Built for applications requiring low latency and high throughput, it balances capability with speed to serve real-time and high-volume use cases.
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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.
1 year newer
Gemini 1.5 Flash
2024-05-01
Grok 4 Fast
xAI
2025-08-28
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Pricing Comparison
Cost per million tokens (USD)
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Gemini 1.5 Flash
Input:$0.15
Output:$0.60
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Grok 4 Fast
Input:$0.20
Output:$0.50($0.05 cheaper)
Performance Metrics
Context window and performance specifications
Average performance across 1 common benchmarks
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Gemini 1.5 Flash
Average Score:51.0%
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Grok 4 Fast
Average Score:85.7%(+34.7%)
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Knowledge Cutoff
Training data recency comparison
Gemini 1.5 Flash
2023-11-01
More recent knowledge cutoff means awareness of newer technologies and frameworks
Provider Availability & Performance
Available providers and their performance metrics
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Gemini 1.5 Flash
1 providers
Throughput: 150 tok/s
Latency: 0.3ms
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Grok 4 Fast
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Gemini 1.5 Flash
Avg Score:51.0%
Providers:1
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Grok 4 Fast
Avg Score:85.7%(+34.7%)
Providers:1