Model Comparison

Grok-1.5 vs Grok-3

Grok-3 significantly outperforms across most benchmarks.

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Performance Benchmarks

Comparative analysis across standard metrics

2 benchmarks

Grok-1.5 outperforms in 0 benchmarks, while Grok-3 is better at 2 benchmarks (GPQA, MMMU).

Grok-3 significantly outperforms across most benchmarks.

Fri Apr 03 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
Fri Apr 03 2026 • llm-stats.com
xAI
Grok-1.5
Input tokens$0.00
Output tokens$0.00
Best providerUnknown Organization
xAI
Grok-3
Input tokens$3.00
Output tokens$15.00
Best providerxAI
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

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

xAI
Grok-1.5
Input- tokens
Output- tokens
xAI
Grok-3
Input128,000 tokens
Output8,000 tokens
Fri Apr 03 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

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

Grok-3 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

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

Proprietary

Closed source

Release Timeline

When each model was launched

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

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

Grok-1.5

Mar 28, 2024

2.0 years ago

Grok-3

Feb 17, 2025

1.1 years ago

10mo newer

Knowledge Cutoff

When training data ends

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

We can confirm Grok-3'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

Nov 2024

Outputs Comparison

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Key Takeaways

xAI
xAI
Larger context window (128,000 tokens)
Supports multimodal inputs
Higher GPQA score (84.6% vs 35.9%)
Higher MMMU score (78.0% vs 53.6%)
xAIGrok-1.5
xAIGrok-3
Compare in Playground

Detailed Comparison

AI Model Comparison Table
Feature
xAI
Grok-1.5
xAI
Grok-3

FAQ

Common questions about Grok-1.5 vs Grok-3

Grok-3 significantly outperforms across most benchmarks. Grok-1.5 is made by xAI and Grok-3 is made by xAI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.
Grok-1.5 scores GSM8k: 90.0%, DocVQA: 85.6%, MMLU: 81.3%, HumanEval: 74.1%, MMMU: 53.6%. Grok-3 scores AIME 2024: 93.3%, AIME 2025: 93.3%, GPQA: 84.6%, LiveCodeBench: 79.4%, MMMU: 78.0%.
Grok-1.5 supports an unknown number of tokens and Grok-3 supports 128K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.
Key differences include multimodal support (no vs yes). See the full comparison above for benchmark-by-benchmark results.