Model Comparison

Grok-1.5 vs Llama 3.1 8B Instruct

Grok-1.5 significantly outperforms across most benchmarks.

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Performance Benchmarks

Comparative analysis across standard metrics

4 benchmarks

Grok-1.5 outperforms in 4 benchmarks (GPQA, HumanEval, MMLU, MMLU-Pro), while Llama 3.1 8B Instruct is better at 0 benchmarks.

Grok-1.5 significantly outperforms across most benchmarks.

Fri May 08 2026 • llm-stats.com

Arena Performance

Human preference votes

Context Window

Maximum input and output token capacity

Only Llama 3.1 8B Instruct specifies input context (131,072 tokens). Only Llama 3.1 8B Instruct specifies output context (131,072 tokens).

xAI
Grok-1.5
Input- tokens
Output- tokens
Meta
Llama 3.1 8B Instruct
Input131,072 tokens
Output131,072 tokens
Fri May 08 2026 • llm-stats.com

License

Usage and distribution terms

Grok-1.5 is licensed under a proprietary license, while Llama 3.1 8B Instruct uses Llama 3.1 Community License.

License differences may affect how you can use these models in commercial or open-source projects.

Grok-1.5

Proprietary

Closed source

Llama 3.1 8B Instruct

Llama 3.1 Community License

Open weights

Release Timeline

When each model was launched

Grok-1.5 was released on 2024-03-28, while Llama 3.1 8B Instruct was released on 2024-07-23.

Llama 3.1 8B Instruct is 4 months newer than Grok-1.5.

Grok-1.5

Mar 28, 2024

2.1 years ago

Llama 3.1 8B Instruct

Jul 23, 2024

1.8 years ago

3mo newer

Knowledge Cutoff

When training data ends

Llama 3.1 8B Instruct has a documented knowledge cutoff of 2023-12-31, while Grok-1.5's cutoff date is not specified.

We can confirm Llama 3.1 8B Instruct's training data extends to 2023-12-31, but cannot make a direct comparison without Grok-1.5's cutoff date.

Grok-1.5

—

Llama 3.1 8B Instruct

Dec 2023

Outputs Comparison

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Key Takeaways

xAI
Higher GPQA score (35.9% vs 30.4%)
Higher HumanEval score (74.1% vs 72.6%)
Higher MMLU score (81.3% vs 69.4%)
Higher MMLU-Pro score (51.0% vs 48.3%)
Meta
Larger context window (131,072 tokens)
Has open weights

Detailed Comparison

AI Model Comparison Table
Feature
xAI
Grok-1.5
Meta
Llama 3.1 8B Instruct

FAQ

Common questions about Grok-1.5 vs Llama 3.1 8B Instruct.

Which is better, Grok-1.5 or Llama 3.1 8B Instruct?

Grok-1.5 significantly outperforms across most benchmarks. Grok-1.5 is made by xAI and Llama 3.1 8B Instruct is made by Meta. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does Grok-1.5 compare to Llama 3.1 8B Instruct in benchmarks?

Grok-1.5 scores GSM8k: 90.0%, DocVQA: 85.6%, MMLU: 81.3%, HumanEval: 74.1%, MMMU: 53.6%. Llama 3.1 8B Instruct scores GSM-8K (CoT): 84.5%, ARC-C: 83.4%, API-Bank: 82.6%, IFEval: 80.4%, BFCL: 76.1%.

What are the context window sizes for Grok-1.5 and Llama 3.1 8B Instruct?

Grok-1.5 supports an unknown number of tokens and Llama 3.1 8B Instruct supports 131K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Grok-1.5 and Llama 3.1 8B Instruct?

Key differences include licensing (Proprietary vs Llama 3.1 Community License). See the full comparison above for benchmark-by-benchmark results.

Who makes Grok-1.5 and Llama 3.1 8B Instruct?

Grok-1.5 is developed by xAI and Llama 3.1 8B Instruct is developed by Meta.