GPT-5 vs Grok-4
GPT-5 and Grok-4 are closely matched at 33.2 and 33.3 on the LLM Stats Score. GPT-5 is 1.7x cheaper per token.
OpenAI · xAI · Updated for 2026
Which is better?
GPT-5 and Grok-4 are closely matched on the overall LLM Stats Score at 33.2 and 33.3.
In the 3 individual benchmarks reported for both models, Grok-4 wins 2; this is a narrower head-to-head signal than the composite indexes.
On price, GPT-5 is roughly 1.7x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
GPT-5 also accepts a larger context window (400,000 input tokens), making it the stronger choice for long documents and large codebases.
Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.
Choose GPT-5
- cost matters — it's about 1.7x cheaper per token
- you process long inputs — it offers a 400,000 token context window
- you want the most recent training data — it shipped Aug 2025
Choose Grok-4
- you value its reported benchmark strengths — it wins 2 of 3 exact shared results
At a glance
The differences that matter most.
Capability indexes
Additional strengths measured across groups of related public benchmarks
Individual benchmarks
34 reported for GPT-5 · 7 for Grok-4
GPT-5 outperforms in 1 benchmarks (AIME 2025), while Grok-4 is better at 2 benchmarks (GPQA, Humanity's Last Exam).
Grok-4 shows notably better performance in the majority of benchmarks.
Human preference
Blind head-to-head votes and playground preference scores
Pricing Analysis
Price comparison per million tokens
For input processing, GPT-5 ($1.25/1M tokens) is 2.4x cheaper than Grok-4 ($3.00/1M tokens).
For output processing, GPT-5 ($10.00/1M tokens) is 1.5x cheaper than Grok-4 ($15.00/1M tokens).
In conclusion, Grok-4 is more expensive than GPT-5.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
GPT-5 accepts 400,000 input tokens compared to Grok-4's 256,000 tokens. GPT-5 can generate longer responses up to 128,000 tokens, while Grok-4 is limited to 8,000 tokens.
Input capabilities
Documented input modalities across available providers
Both GPT-5 and Grok-4 support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
GPT-5
Grok-4
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-5 was released on 2025-08-07, while Grok-4 was released on 2025-07-09.
GPT-5 is 1 month newer than Grok-4.
Aug 7, 2025
1.2 years ago
4w newerJul 9, 2025
1.3 years ago
Knowledge Cutoff
When training data ends
GPT-5 has a knowledge cutoff of 2024-09-30, while Grok-4 has a cutoff of 2024-12-31.
Grok-4 has more recent training data (up to 2024-12-31), making it potentially better informed about events through that date compared to GPT-5 (2024-09-30).
Sep 2024
Dec 2024
3 mo newerProvider Availability
GPT-5 is available from OpenAI. Grok-4 is available from xAI.
GPT-5
Grok-4
Outputs Comparison
Judge for yourself.
Run your own prompts against GPT-5 and Grok-4 side-by-side, then vote on the output you prefer.
FAQ
Common questions about GPT-5 vs Grok-4.