Grok 4.5 is a model from SpaceXAI with frontier performance on coding, knowledge work, and STEM.
SpaceXAI: Grok 4.5 — xAI. Context window 500,000 tokens. API pricing (per 1M tokens): Input $2, Output $6. License: Proprietary. LMArena 1,448. GPQA Diamond 93.4%.
| Provider | xAI |
|---|---|
| API model ID | x-ai/grok-4.5 |
| Tier | Frontier |
| Context window | 500,000 tokens |
| Max output | 450,000 tokens |
| License | Proprietary |
| API pricing (per 1M tokens) · Input | $2 |
| API pricing (per 1M tokens) · Output | $6 |
| LMArena | 1,448 (grok-4.5) |
| GPQA Diamond | 93.4% |
LMArena (CC-BY 4.0, best reasoning setting, 2026-10-02) · GPQA Diamond: Epoch AI (CC-BY 4.0)
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