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Grok-1.5 vs Grok-3 Mini

Grok-3 Mini leads the LLM Stats Score 31.3 to -2.6.

xAI · xAI · Updated for 2026

Which is better?

Grok-3 Mini leads the overall LLM Stats Score 31.3 to -2.6, ranking #119 overall.

In the 1 individual benchmarks reported for both models, Grok-3 Mini 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 Grok-1.5

  • you are already invested in the xAI ecosystem

Choose Grok-3 Mini

  • overall performance matters — it scores 31.3 and ranks #119 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 Feb 2025

At a glance

The differences that matter most.

Grok-1.5
xAI
Grok-3 Mini
xAI
Core performance indexes
LLM Stats Score
-2.6
#348
31.3
#119
Reasoning
-2.2
#338
30.9
#120
Coding
-0.9
#254
18.7
#118
Cost, coverage & limits
Benchmark wins
0 of 1
1 of 1
Input price
— / M
$0.30 / M
Output price
— / M
$0.50 / M
Context window
—
128,000

Capability indexes

Additional strengths measured across groups of related public benchmarks

1 shared
Index
Grok-1.5
Grok-3 Mini
Math
4.9#279
28.3#96
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

9 reported for Grok-1.5 · 4 for Grok-3 Mini

1 shared

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

Grok-3 Mini significantly outperforms across most benchmarks.

Fri Oct 02 2026 • llm-stats.com

Human preference

Blind head-to-head votes and playground preference scores

Context Window

Maximum input and output token capacity

Only Grok-3 Mini specifies input context (128,000 tokens). Only Grok-3 Mini specifies output context (8,000 tokens).

xAI
Grok-1.5
Input- tokens
Output- tokens
xAI
Grok-3 Mini
Input128,000 tokens
Output8,000 tokens
Fri Oct 02 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

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

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

Grok-1.5

Text
Images
Audio
Video

Grok-3 Mini

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.

Grok-1.5

Proprietary

Closed source

Grok-3 Mini

Proprietary

Closed source

Release Timeline

When each model was launched

Grok-1.5 was released on 2024-03-28, while Grok-3 Mini was released on 2025-02-17.

Grok-3 Mini is 11 months newer than Grok-1.5.

Grok-1.5

Mar 28, 2024

2.5 years ago

Grok-3 Mini

Feb 17, 2025

1.6 years ago

10mo newer

Knowledge Cutoff

When training data ends

Grok-3 Mini has a documented knowledge cutoff of 2024-11-17, while Grok-1.5's cutoff date is not specified.

We can confirm Grok-3 Mini's training data extends to 2024-11-17, but cannot make a direct comparison without Grok-1.5's cutoff date.

Grok-1.5

—

Grok-3 Mini

Nov 2024

Outputs Comparison

Notice missing or incorrect data?

Judge for yourself.

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

Grok-1.5
✓ Preferred
Grok-3 Mini
Open in Playground

FAQ

Common questions about Grok-1.5 vs Grok-3 Mini.

Which is better, Grok-1.5 or Grok-3 Mini?

Grok-3 Mini leads the LLM Stats Score 31.3 to -2.6. Grok-1.5 is made by xAI and Grok-3 Mini is made by xAI. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does Grok-1.5 compare to Grok-3 Mini in benchmarks?

Grok-1.5 scores GSM8k: 90.0%, DocVQA: 85.6%, MMLU: 81.3%, HumanEval: 74.1%, MMMU: 53.6%. Grok-3 Mini scores AIME 2024: 95.8%, AIME 2025: 90.8%, GPQA: 84.0%, LiveCodeBench: 80.4%.

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

Grok-1.5 supports an unknown number of tokens and Grok-3 Mini supports 128K 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 Grok-3 Mini?

Key differences include LLM Stats Score (-2.6 vs 31.3), multimodal support (no vs yes). See the full comparison above for benchmark-by-benchmark results.

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