GPT-4o vs Grok 4
Benchmarks, API pricing and specs, head to head. Data updated 2026-06-10.
GPT-4o
OpenAI · May 2024
The 2024 omni-modal classic with native audio in and out; superseded at the frontier but still everywhere in production.
Grok 4
xAI · Jul 2025
xAI's mid-2025 flagship, trained on the 200K-GPU Colossus cluster — a math and science reasoning standout of its generation.
The verdict
Grok 4 wins 1 of the 1 benchmarks these models share, against 0 for GPT-4o. GPT-4o is about 1.4x cheaper per blended million tokens (3:1 input:output mix). Grok 4 also takes 256K of context versus 128K for GPT-4o.
Benchmark head-to-head 0–1
Specs & pricing
| GPT-4o | Grok 4 | |
|---|---|---|
| modhub Index | — | — |
| Input price / 1M | $2.5 | $3 |
| Output price / 1M | $10 | $15 |
| Context window | 128K | 256K |
| Max output | 16K | — |
| Open weights | no | no |
| Reasoning model | no | yes |
| Multimodal input | text, image, audio | text, image |
| Knowledge cutoff | Oct 2023 | Jul 2025 |
| Released | May 2024 | Jul 2025 |
| Example monthly cost* | $40.00 | $52.50 |
* 10M input + 1.5M output tokens per month at list prices, no caching. Green = better value on that row.
Frequently asked questions
- Which is better, GPT-4o or Grok 4?
- Grok 4 wins 1 of the 1 benchmarks these models share, against 0 for GPT-4o. GPT-4o is about 1.4x cheaper per blended million tokens (3:1 input:output mix). Grok 4 also takes 256K of context versus 128K for GPT-4o.
- Which is cheaper, GPT-4o or Grok 4?
- GPT-4o costs $2.5/$10 per million input/output tokens, while Grok 4 costs $3/$15. For a typical workload of 10M input and 1.5M output tokens per month, that's $40.00 versus $52.50.
- Which model is better for coding, GPT-4o or Grok 4?
- We don't yet track SWE-bench Verified results for both models; check their individual pages for coding-related scores.