GPT-5 Codex vs Grok Build 0.1
OpenAI vs xAI — benchmarks, pricing, and capabilities side by side.
- •Grok Build 0.1 is cheaper ($1.00 vs $1.25 per 1M input)
- •GPT-5 Codex has a larger context window (400K)
| GPT-5 Codex | Grok Build 0.1 | |
|---|---|---|
| Intelligence index | 87.1 | — |
| Developer | OpenAI | xAI |
| Type | Multimodal | Multimodal |
| Access | API only | API only |
| Context window | 400,000 tokens | 256,000 tokens |
| Input price | $1.25 / 1M | $1.00 / 1M |
| Output price | $10.00 / 1M | $2.00 / 1M |
| Speed | 180 tok/s | — |
| Released | September 23, 2025 | May 20, 2026 |
| Parameters | — | — |
| Input modalities | Text, Image | Text, Image |
| Output modalities | Text | Text |