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Gemini 3 Pro vs Grok-1.5

Gemini 3 Pro leads the LLM Stats Score 38.4 to -2.5.

Google · xAI · Updated for 2026

Which is better?

Gemini 3 Pro leads the overall LLM Stats Score 38.4 to -2.5, ranking #62 overall.

In the 1 individual benchmarks reported for both models, Gemini 3 Pro wins 1; this is a narrower head-to-head signal than the composite indexes.

Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.

Choose Gemini 3 Pro

  • overall performance matters — it scores 38.4 and ranks #62 on LLM Stats
  • your work emphasizes reasoning and coding — it leads those capability indexes
  • you value its reported benchmark strengths — it wins 1 of 1 exact shared results
  • you want the most recent training data — it shipped Nov 2025

Choose Grok-1.5

  • you are already invested in the xAI ecosystem

At a glance

The differences that matter most.

Gemini 3 Pro
Google
Grok-1.5
xAI
Core performance indexes
LLM Stats Score
38.4
#62
-2.5
#328
Reasoning
38.5
#59
-2.0
#318
Coding
24.2
#67
-0.8
#237
Cost, coverage & limits
Benchmark wins
1 of 1
0 of 1
Input price
$2.00 / M
— / M
Output price
$12.00 / M
— / M
Context window
1,048,576
—

Capability indexes

Additional strengths measured across groups of related public benchmarks

3 shared
Index
Gemini 3 Pro
Grok-1.5
Math
37.0#32
5.4#266
Vision
25.7#40
-4.8#197
Multimodal
27.2#36
-2.2#156
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

21 reported for Gemini 3 Pro · 9 for Grok-1.5

1 shared

Gemini 3 Pro outperforms in 1 benchmarks (GPQA), while Grok-1.5 is better at 0 benchmarks.

Gemini 3 Pro significantly outperforms across most benchmarks.

Sun Sep 06 2026 • llm-stats.com

Human preference

Blind head-to-head votes and playground preference scores

Context Window

Maximum input and output token capacity

Only Gemini 3 Pro specifies input context (1,048,576 tokens). Only Gemini 3 Pro specifies output context (65,536 tokens).

Google
Gemini 3 Pro
Input1,048,576 tokens
Output65,536 tokens
xAI
Grok-1.5
Input- tokens
Output- tokens
Sun Sep 06 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Gemini 3 Pro supports multimodal inputs, whereas Grok-1.5 does not.

Gemini 3 Pro can handle both text and other forms of data like images, making it suitable for multimodal applications.

Gemini 3 Pro

Text
Images
Audio
Video

Grok-1.5

Text
Images
Audio
Video

License

Usage and distribution terms

Both models are licensed under proprietary licenses.

Both models have usage restrictions defined by their respective organizations.

Gemini 3 Pro

Proprietary

Closed source

Grok-1.5

Proprietary

Closed source

Release Timeline

When each model was launched

Gemini 3 Pro was released on 2025-11-18, while Grok-1.5 was released on 2024-03-28.

Gemini 3 Pro is 20 months newer than Grok-1.5.

Gemini 3 Pro

Nov 18, 2025

9 months ago

1.6yr newer
Grok-1.5

Mar 28, 2024

2.4 years ago

Knowledge Cutoff

When training data ends

Gemini 3 Pro has a documented knowledge cutoff of 2025-01-31, while Grok-1.5's cutoff date is not specified.

We can confirm Gemini 3 Pro's training data extends to 2025-01-31, but cannot make a direct comparison without Grok-1.5's cutoff date.

Gemini 3 Pro

Jan 2025

Grok-1.5

—

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Judge for yourself.

Run your own prompts against Gemini 3 Pro and Grok-1.5 side-by-side, then vote on the output you prefer.

Gemini 3 Pro
✓ Preferred
Grok-1.5
Open in Playground

FAQ

Common questions about Gemini 3 Pro vs Grok-1.5.

Which is better, Gemini 3 Pro or Grok-1.5?

Gemini 3 Pro leads the LLM Stats Score 38.4 to -2.5. Gemini 3 Pro is made by Google and Grok-1.5 is made by xAI. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does Gemini 3 Pro compare to Grok-1.5 in benchmarks?

Gemini 3 Pro scores AIME 2025: 100.0%, Vending-Bench 2: 100.0%, Global PIQA: 93.4%, GPQA: 91.9%, MMMLU: 91.8%. Grok-1.5 scores GSM8k: 90.0%, DocVQA: 85.6%, MMLU: 81.3%, HumanEval: 74.1%, MMMU: 53.6%.

What are the context window sizes for Gemini 3 Pro and Grok-1.5?

Gemini 3 Pro supports 1.0M 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.

What are the main differences between Gemini 3 Pro and Grok-1.5?

Key differences include LLM Stats Score (38.4 vs -2.5), multimodal support (yes vs no). See the full comparison above for benchmark-by-benchmark results.

Who makes Gemini 3 Pro and Grok-1.5?

Gemini 3 Pro is developed by Google and Grok-1.5 is developed by xAI.

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