Model Comparison

Grok-1.5 vs o1-mini

o1-mini significantly outperforms across most benchmarks.

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Performance Benchmarks

Comparative analysis across standard metrics

3 benchmarks

Grok-1.5 outperforms in 0 benchmarks, while o1-mini is better at 3 benchmarks (GPQA, HumanEval, MMLU).

o1-mini significantly outperforms across most benchmarks.

Thu May 07 2026 • llm-stats.com

Arena Performance

Human preference votes

Context Window

Maximum input and output token capacity

Only o1-mini specifies input context (128,000 tokens). Only o1-mini specifies output context (65,536 tokens).

xAI
Grok-1.5
Input- tokens
Output- tokens
OpenAI
o1-mini
Input128,000 tokens
Output65,536 tokens
Thu May 07 2026 • llm-stats.com

License

Usage and distribution terms

Both models are licensed under proprietary licenses.

Both models have usage restrictions defined by their respective organizations.

Grok-1.5

Proprietary

Closed source

o1-mini

Proprietary

Closed source

Release Timeline

When each model was launched

Grok-1.5 was released on 2024-03-28, while o1-mini was released on 2024-09-12.

o1-mini is 6 months newer than Grok-1.5.

Grok-1.5

Mar 28, 2024

2.1 years ago

o1-mini

Sep 12, 2024

1.6 years ago

5mo newer

Knowledge Cutoff

When training data ends

Neither model specifies a knowledge cutoff date.

Unable to compare the recency of their training data.

No cutoff dates available

Outputs Comparison

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Key Takeaways

xAI

No standout differentiators in the data we have for this pair.

OpenAI
Larger context window (128,000 tokens)
Higher GPQA score (60.0% vs 35.9%)
Higher HumanEval score (92.4% vs 74.1%)
Higher MMLU score (85.2% vs 81.3%)

Detailed Comparison

AI Model Comparison Table
Feature
xAI
Grok-1.5
OpenAI
o1-mini

FAQ

Common questions about Grok-1.5 vs o1-mini.

Which is better, Grok-1.5 or o1-mini?

o1-mini significantly outperforms across most benchmarks. Grok-1.5 is made by xAI and o1-mini is made by OpenAI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does Grok-1.5 compare to o1-mini in benchmarks?

Grok-1.5 scores GSM8k: 90.0%, DocVQA: 85.6%, MMLU: 81.3%, HumanEval: 74.1%, MMMU: 53.6%. o1-mini scores HumanEval: 92.4%, MATH-500: 90.0%, MMLU: 85.2%, SuperGLUE: 75.0%, GPQA: 60.0%.

What are the context window sizes for Grok-1.5 and o1-mini?

Grok-1.5 supports an unknown number of tokens and o1-mini supports 128K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

Who makes Grok-1.5 and o1-mini?

Grok-1.5 is developed by xAI and o1-mini is developed by OpenAI.