Grok-1.5 vs Grok-3
Grok-3 leads the LLM Stats Score 30.8 to -2.4.
xAI · xAI · Updated for 2026
Which is better?
Grok-3 leads the overall LLM Stats Score 30.8 to -2.4, ranking #105 overall.
In the 2 individual benchmarks reported for both models, Grok-3 wins 2; 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
- overall performance matters — it scores 30.8 and ranks #105 on LLM Stats
- your work emphasizes reasoning and coding — it leads those capability indexes
- you value its reported benchmark strengths — it wins 2 of 2 exact shared results
- you want the most recent training data — it shipped Feb 2025
At a glance
The differences that matter most.
Capability indexes
Additional strengths measured across groups of related public benchmarks
Individual benchmarks
9 reported for Grok-1.5 · 5 for Grok-3
Grok-1.5 outperforms in 0 benchmarks, while Grok-3 is better at 2 benchmarks (GPQA, MMMU).
Grok-3 significantly outperforms across most benchmarks.
Human preference
Blind head-to-head votes and playground preference scores
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).
Input capabilities
Documented input modalities across available providers
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
Grok-3
License
Usage and distribution terms
Both models are licensed under proprietary licenses.
Both models have usage restrictions defined by their respective organizations.
Proprietary
Closed source
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.
Mar 28, 2024
2.4 years ago
Feb 17, 2025
1.5 years ago
10mo newerKnowledge 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.
—
Nov 2024
Outputs Comparison
Judge for yourself.
Run your own prompts against Grok-1.5 and Grok-3 side-by-side, then vote on the output you prefer.
FAQ
Common questions about Grok-1.5 vs Grok-3.