GPT-5.5 Instant vs Grok 4.3
OpenAI vs xAI — benchmarks, pricing, and capabilities side by side.
- •Grok 4.3 is cheaper ($1.25 vs $5.00 per 1M input)
| GPT-5.5 Instant | Grok 4.3 | |
|---|---|---|
| Intelligence index | — | 90.1 |
| Developer | OpenAI | xAI |
| Type | LLM | LLM |
| Access | — | API only |
| Context window | — | 1,000,000 tokens |
| Input price | $5.00 / 1M | $1.25 / 1M |
| Output price | $30.00 / 1M | $2.50 / 1M |
| Speed | — | 88 tok/s |
| Released | May 5, 2026 | May 6, 2026 |
| Parameters | — | — |
| Input modalities | — | Text, Image |
| Output modalities | — | Text |