Grok 4.3 — API Pricing & Benchmarks
Grok 4.3 is xAI's flagship reasoning model, released in 2026-04. The API costs $1.25 per 1M input tokens and $2.50 per 1M output tokens ($1.56 blended at a 3:1 ratio), with cached input at $0.20. It supports a 1M-token context window. On the independently measured Artificial Analysis Intelligence Index it scores 37.9, ranking #45 of 68 models tracked on this site, with a median output speed of 137 tokens/sec.
Explore provider routes and additional benchmark sources for Grok 4.3
| Provider | xAI |
| Input price / 1M tokens | $1.25 |
| Output price / 1M tokens | $2.50 |
| Cached input / 1M tokens | $0.20 |
| Blended price (3:1) | $1.56 |
| Context window | 1M |
| Max output tokens | — |
| Knowledge cutoff | 2025-12 |
| License | proprietary |
| Input modalities | T+I |
| Output speed (tok/s) | 137 |
| Released | 2026-04 |
| Artificial Analysis Intelligence Index | 37.9 |
| LMArena Elo | 1398 |
| GPQA Diamond | 90.1% |
| Humanity's Last Exam | 37.2% |
Where Grok 4.3 fits
On a blended 3:1 basis Grok 4.3 costs $1.56 per 1M tokens, cheaper than 53% of the 80 priced models in this index. As xAI's flagship it is aimed at the hardest workloads — complex reasoning, agentic coding and multi-step tool use — where output quality dominates cost. Cached input is priced at $0.20 (84% below standard input), which rewards prompt structures with long stable prefixes — see our caching guide.
Price history
| Period | Input $/1M | Output $/1M | Cached $/1M |
|---|---|---|---|
| 2026-07-18 → current | $1.25 | $2.50 | $0.20 |
No list-price changes recorded since tracking began. Full dataset: price-history.json (CC BY 4.0).
Alternatives at a similar price
- Grok 4.20 (xAI) — $1.56/1M blended
- GLM-5 (Zhipu AI (Z.ai)) — $1.55/1M blended, AA Index 40.6
- Gemini 3.8 Flash (Google) — $1.50/1M blended, AA Index 58.7
- Gemini 3.7 Flash (Google) — $1.50/1M blended, AA Index 56
About xAI
xAI's Grok models compete aggressively on price: Grok 4.6 ties the proprietary frontier on the Artificial Analysis index at a mid-tier price point, and the older Grok 4.x models are among the cheapest ways to buy a large context window.