Grok 4.3 is a reasoning model from SpaceXAI. It accepts text and image inputs with text output, and is suited for agentic workflows, instruction-following tasks, and applications requiring high factual...
SpaceXAI: Grok 4.3 — xAI. Context window 1,000,000 tokens. API pricing (per 1M tokens): Input $1.25, Output $2.5. License: Proprietary. LMArena 1,397. GPQA Diamond 88.8%.
| Provider | xAI |
|---|---|
| API model ID | x-ai/grok-4.3 |
| Tier | Frontier |
| Context window | 1,000,000 tokens |
| Max output | 900,000 tokens |
| License | Proprietary |
| API pricing (per 1M tokens) · Input | $1.25 |
| API pricing (per 1M tokens) · Output | $2.5 |
| LMArena | 1,397 (grok-4.3) |
| GPQA Diamond | 88.8% |
LMArena (CC-BY 4.0, best reasoning setting, 2026-10-02) · GPQA Diamond: Epoch AI (CC-BY 4.0)
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