Grok 4.3
Key facts · verified Oct 29, 2026
Grok 4.3 is a SpaceXSI model released on 1 Feb 2026. Its API price is $1.25 per million input tokens and $2.50 per million output tokens (under 200k prompt tokens; $2.50 / $5.00 at 200k and above). Its context window is 1M tokens. It ranks #93 on LMArena's text leaderboard (Elo 1442, read 1 Nov 2026). Source: docs.x.ai.
Grok 4.3 is a SpaceXSI model with a 1M-token context window, listed on xAI's API models page alongside Grok 4.5, Grok 4.6 and Grok 4.7. xAI prices it at $1.25 per million input tokens and $2.50 per million output tokens for prompts under 200k tokens, with higher rates at 200k and above. Since 15 May 2026, xAI redirects several retired Grok API models, including grok-4-0709 and grok-3, to grok-4.3. On LMArena's text leaderboard: 1442 Elo (rank 93).
Key Features
Full Specifications
$1.25 / $2.50 per million tokens | |
|---|---|
| Identity | |
| Developer | SpaceXSI |
| Released | Feb 2026 |
| Licence | Proprietary |
| Self-hostable | No |
| Cost | |
| Blended $/1M tokensinput × 0.75 + output × 0.25 | $1.563 / 1M tokens |
| Input price | $1.250 / 1M tokens |
| Output price | $2.500 / 1M tokens |
| Capacity | |
| Context window | 1M tokens |
| Measured quality | |
| LMArena Elo | 1442 (checked Nov 2026) |
| LMArena rank | Rank 93 |
| GPQA Diamond | 89 · high effort |
| Elo per dollarLMArena Elo ÷ blended $/1M tokens | 923 |