GPT-5.5 Instant vs Grok 4.20 0309 v2
OpenAI vs xAI — benchmarks, pricing, and capabilities side by side.
- •Grok 4.20 0309 v2 is cheaper ($2.00 vs $5.00 per 1M input)
| GPT-5.5 Instant | Grok 4.20 0309 v2 | |
|---|---|---|
| Intelligence index | — | 91.1 |
| Developer | OpenAI | xAI |
| Type | LLM | LLM |
| Access | — | — |
| Context window | — | — |
| Input price | $5.00 / 1M | $2.00 / 1M |
| Output price | $30.00 / 1M | $6.00 / 1M |
| Speed | — | 105 tok/s |
| Released | May 5, 2026 | April 7, 2026 |
| Parameters | — | — |
| Input modalities | — | — |
| Output modalities | — | — |