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Grok-1.5 vs Grok-4 Heavy
Comprehensive side-by-side LLM comparison
Grok-1.5 leads with 7.0% higher average benchmark score. Grok-4 Heavy supports multimodal inputs. Overall, Grok-1.5 is the stronger choice for coding tasks.
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xAI
Grok-1.5 is a language model developed by xAI. It achieves strong performance with an average score of 63.9% across 9 benchmarks. It excels particularly in GSM8k (90.0%), DocVQA (85.6%), MMLU (81.3%). Released in 2024, it represents xAI's latest advancement in AI technology.
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xAI
Grok-4 Heavy is a multimodal language model developed by xAI. It achieves strong performance with an average score of 79.5% across 6 benchmarks. It excels particularly in AIME 2025 (100.0%), HMMT25 (96.7%), GPQA (88.4%). 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
Grok-1.5
xAI
2024-03-28
Grok-4 Heavy
xAI
2025-07-09
Average performance across 14 common benchmarks
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Grok-1.5
Average Score:41.1%(+7.0%)
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Grok-4 Heavy
Average Score:34.1%
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Knowledge Cutoff
Training data recency comparison
Grok-4 Heavy
2024-12-31
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-1.5
0 providers
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Grok-4 Heavy
0 providers
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Grok-1.5
Avg Score:41.1%(+7.0%)
Providers:0
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Grok-4 Heavy
Avg Score:34.1%
Providers:0