GPT-4o vs Grok-1.5
GPT-4o leads the LLM Stats Score 14.1 to -2.6.
OpenAI · xAI · Updated for 2026
Which is better?
GPT-4o leads the overall LLM Stats Score 14.1 to -2.6, ranking #245 overall.
In the 6 individual benchmarks reported for both models, GPT-4o wins 6; 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 GPT-4o
- overall performance matters — it scores 14.1 and ranks #245 on LLM Stats
- your work emphasizes reasoning — it leads those capability indexes
- you value its reported benchmark strengths — it wins 6 of 6 exact shared results
- you want the most recent training data — it shipped Aug 2024
Choose Grok-1.5
- you are already invested in the xAI ecosystem
At a glance
The differences that matter most.
Capability indexes
Additional strengths measured across groups of related public benchmarks
Individual benchmarks
38 reported for GPT-4o · 9 for Grok-1.5
GPT-4o outperforms in 6 benchmarks (DocVQA, GPQA, MathVista, MMLU, MMLU-Pro, MMMU), while Grok-1.5 is better at 0 benchmarks.
GPT-4o 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 GPT-4o specifies input context (128,000 tokens). Only GPT-4o specifies output context (16,384 tokens).
Input capabilities
Documented input modalities across available providers
GPT-4o supports multimodal inputs, whereas Grok-1.5 does not.
GPT-4o can handle both text and other forms of data like images, making it suitable for multimodal applications.
GPT-4o
Grok-1.5
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
GPT-4o was released on 2024-08-06, while Grok-1.5 was released on 2024-03-28.
GPT-4o is 4 months newer than Grok-1.5.
Aug 6, 2024
2.1 years ago
4mo newerMar 28, 2024
2.5 years ago
Knowledge Cutoff
When training data ends
Neither model specifies a knowledge cutoff date.
Unable to compare the recency of their training data.
Outputs Comparison
Judge for yourself.
Run your own prompts against GPT-4o and Grok-1.5 side-by-side, then vote on the output you prefer.
FAQ
Common questions about GPT-4o vs Grok-1.5.