Model Comparison

o1 vs Grok-1.5

o1 significantly outperforms across most benchmarks.

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Performance Benchmarks

Comparative analysis across standard metrics

7 benchmarks

o1 outperforms in 7 benchmarks (GPQA, GSM8k, HumanEval, MATH, MathVista, MMLU, MMMU), while Grok-1.5 is better at 0 benchmarks.

o1 significantly outperforms across most benchmarks.

Tue Apr 07 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

Cost data unavailable.

Lowest available price from all providers
Tue Apr 07 2026 • llm-stats.com
OpenAI
o1
Input tokens$15.00
Output tokens$60.00
Best providerAzure
xAI
Grok-1.5
Input tokens$0.00
Output tokens$0.00
Best providerUnknown Organization
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Context Window

Maximum input and output token capacity

Only o1 specifies input context (200,000 tokens). Only o1 specifies output context (100,000 tokens).

OpenAI
o1
Input200,000 tokens
Output100,000 tokens
xAI
Grok-1.5
Input- tokens
Output- tokens
Tue Apr 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.

o1

Proprietary

Closed source

Grok-1.5

Proprietary

Closed source

Release Timeline

When each model was launched

o1 was released on 2024-12-17, while Grok-1.5 was released on 2024-03-28.

o1 is 9 months newer than Grok-1.5.

o1

Dec 17, 2024

1.3 years ago

8mo newer
Grok-1.5

Mar 28, 2024

2.0 years ago

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

OpenAI
Larger context window (200,000 tokens)
Higher GPQA score (78.0% vs 35.9%)
Higher GSM8k score (97.1% vs 90.0%)
Higher HumanEval score (88.1% vs 74.1%)
Higher MATH score (96.4% vs 50.6%)
Higher MathVista score (71.8% vs 52.8%)
Higher MMLU score (91.8% vs 81.3%)
Higher MMMU score (77.6% vs 53.6%)
xAI

Detailed Comparison

AI Model Comparison Table
Feature
OpenAI
o1
xAI
Grok-1.5

FAQ

Common questions about o1 vs Grok-1.5

o1 significantly outperforms across most benchmarks. o1 is made by OpenAI and Grok-1.5 is made by xAI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.
o1 scores GSM8k: 97.1%, MATH: 96.4%, GPQA Physics: 92.8%, MMLU: 91.8%, MGSM: 89.3%. Grok-1.5 scores GSM8k: 90.0%, DocVQA: 85.6%, MMLU: 81.3%, HumanEval: 74.1%, MMMU: 53.6%.
o1 supports 200K tokens and Grok-1.5 supports an unknown number of tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.
o1 is developed by OpenAI and Grok-1.5 is developed by xAI.