gpt-oss-20b vs Grok 4.3
OpenAI vs xAI — benchmarks, pricing, and capabilities side by side.
- •Grok 4.3 has the higher intelligence index (90.1 vs 73.6)
- •gpt-oss-20b is cheaper ($0.03 vs $1.25 per 1M input)
- •gpt-oss-20b is faster
- •Grok 4.3 has a larger context window (1M)
| gpt-oss-20b | Grok 4.3 | |
|---|---|---|
| Intelligence index | 73.6 | 90.1 |
| Developer | OpenAI | xAI |
| Type | LLM | LLM |
| Access | Open weights | API only |
| Context window | 131,072 tokens | 1,000,000 tokens |
| Input price | $0.03 / 1M | $1.25 / 1M |
| Output price | $0.14 / 1M | $2.50 / 1M |
| Speed | 1000 tok/s | 88 tok/s |
| Released | August 5, 2025 | May 6, 2026 |
| Parameters | 21B (3.6B active) | — |
| Input modalities | Text | Text, Image |
| Output modalities | Text | Text |
Shared benchmarks
gpt-oss-20b
Grok 4.3
GPQA Diamond
71.5
90.1
Humanity’s Last Exam
17.3
35