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Grok-4 Heavy vs Llama 3.1 405B Instruct
Comprehensive side-by-side LLM comparison
Grok-4 Heavy leads with 37.7% higher average benchmark score. Grok-4 Heavy supports multimodal inputs. Llama 3.1 405B Instruct is available on 8 providers. Overall, Grok-4 Heavy is the stronger choice for coding tasks.
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xAI
Grok 4 Heavy was created as a larger, more capable variant of Grok 4, designed to provide maximum reasoning depth and analytical capability. Built for the most demanding applications requiring sophisticated problem-solving, it represents xAI's flagship offering in the fourth generation.
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Meta
Llama 3.1 405B was developed as Meta's largest open-source language model, designed to provide frontier-level capabilities with 405 billion parameters. Built to demonstrate that open-source models can match proprietary systems in capability, it enables researchers and developers to experiment with and deploy a powerful foundation model without licensing restrictions.
11 months newer
Llama 3.1 405B Instruct
Meta
2024-07-23
Grok-4 Heavy
xAI
2025-07-09
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Performance Metrics
Context window and performance specifications
Average performance across 1 common benchmarks
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Grok-4 Heavy
Average Score:88.4%(+37.7%)
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Llama 3.1 405B Instruct
Average Score:50.7%
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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-4 Heavy
0 providers
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Llama 3.1 405B Instruct
8 providers
Bedrock
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Grok-4 Heavy
Avg Score:88.4%(+37.7%)
Providers:0
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Llama 3.1 405B Instruct
Avg Score:50.7%
Providers:8