Grok-1.5 vs o3-mini
o3-mini leads the LLM Stats Score 21.8 to -2.0.
xAI · OpenAI · Updated for 2026
Which is better?
o3-mini leads the overall LLM Stats Score 21.8 to -2.0, ranking #169 overall.
In the 3 individual benchmarks reported for both models, o3-mini wins 3; 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 o3-mini
- overall performance matters — it scores 21.8 and ranks #169 on LLM Stats
- your work emphasizes reasoning — it leads those capability indexes
- you value its reported benchmark strengths — it wins 3 of 3 exact shared results
- you want the most recent training data — it shipped Jan 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 · 25 for o3-mini
Grok-1.5 outperforms in 0 benchmarks, while o3-mini is better at 3 benchmarks (GPQA, MATH, MMLU).
o3-mini 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 o3-mini specifies input context (200,000 tokens). Only o3-mini specifies output context (100,000 tokens).
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 o3-mini was released on 2025-01-30.
o3-mini is 10 months newer than Grok-1.5.
Mar 28, 2024
2.4 years ago
Jan 30, 2025
1.6 years ago
10mo newerKnowledge Cutoff
When training data ends
o3-mini has a documented knowledge cutoff of 2023-09-30, while Grok-1.5's cutoff date is not specified.
We can confirm o3-mini's training data extends to 2023-09-30, but cannot make a direct comparison without Grok-1.5's cutoff date.
—
Sep 2023
Outputs Comparison
Judge for yourself.
Run your own prompts against Grok-1.5 and o3-mini side-by-side, then vote on the output you prefer.
FAQ
Common questions about Grok-1.5 vs o3-mini.