GPT Audio vs Grok-4 Heavy
OpenAI vs xAI — benchmarks, pricing, and capabilities side by side.
| GPT Audio | Grok-4 Heavy | |
|---|---|---|
| Intelligence index | — | 89.3 |
| Developer | OpenAI | xAI |
| Type | Multimodal | Multimodal |
| Access | API only | API only |
| Context window | 128,000 tokens | — |
| Input price | $2.50 / 1M | — |
| Output price | $10.00 / 1M | — |
| Speed | — | — |
| Released | January 19, 2026 | July 9, 2025 |
| Parameters | — | — |
| Input modalities | Text, Audio | — |
| Output modalities | Text, Audio | — |