GPT-4o vs Grok-2
GPT-4o and Grok-2 are closely matched at 11.5 and 11.4 on the LLM Stats Score. Grok-2 is 1.1x cheaper per token.
OpenAI · xAI · Updated for 2026
Which is better?
GPT-4o and Grok-2 are closely matched on the overall LLM Stats Score at 11.5 and 11.4.
The models split the 6 individual benchmarks reported for both models evenly.
On price, Grok-2 is roughly 1.1x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.
Choose GPT-4o
- you want predictable pricing at $2.50/M input and $10.00/M output
Choose Grok-2
- cost matters — it's about 1.1x cheaper per token
- you want the most recent training data — it shipped Aug 2024
At a glance
The differences that matter most.
Capability indexes
Additional strengths measured across groups of related public benchmarks
Individual benchmarks
8 reported for GPT-4o · 8 for Grok-2
GPT-4o outperforms in 3 benchmarks (HumanEval, MATH, MMLU), while Grok-2 is better at 3 benchmarks (GPQA, MathVista, MMLU-Pro).
Both models are evenly matched across the benchmarks.
Human preference
Blind head-to-head votes and playground preference scores
Pricing Analysis
Price comparison per million tokens
For input processing, GPT-4o ($2.50/1M tokens) is 1.3x more expensive than Grok-2 ($2.00/1M tokens).
For output processing, GPT-4o ($10.00/1M tokens) costs the same as Grok-2 ($10.00/1M tokens).
In conclusion, GPT-4o is more expensive than Grok-2.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
Both models have the same input context window of 128,000 tokens. Grok-2 can generate longer responses up to 8,000 tokens, while GPT-4o is limited to 4,096 tokens.
Input capabilities
Documented input modalities across available providers
Both GPT-4o and Grok-2 support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
GPT-4o
Grok-2
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 2024-05-13, while Grok-2 was released on 2024-08-13.
Grok-2 is 3 months newer than GPT-4o.
May 13, 2024
2.3 years ago
Aug 13, 2024
2.1 years ago
3mo newerKnowledge Cutoff
When training data ends
Neither model specifies a knowledge cutoff date.
Unable to compare the recency of their training data.
Provider Availability
GPT-4o is available from Azure, OpenAI. Grok-2 is available from xAI.
GPT-4o
Grok-2
Outputs Comparison
Judge for yourself.
Run your own prompts against GPT-4o and Grok-2 side-by-side, then vote on the output you prefer.
FAQ
Common questions about GPT-4o vs Grok-2.