Grok 4.5 vs Kimi K3
How do these models stack up? Below is an expert side-by-side comparison of specifications, context window capacity, live pricing per million tokens, and standardized benchmark scores for Grok 4.5 and Kimi K3.
Grok 4.5
Grok 4.5 is SpaceXAI's smartest model with frontier performance on coding, knowledge work, and STEM.
Kimi K3
Kimi K3 is an ultra-large-scale, open-weight multimodal reasoning model from Moonshot AI. It is suited for complex coding, knowledge work, and long-horizon agentic workflows, and is particularly strong at navigating...
Technical Specifications
| Specification | Grok 4.5 | Kimi K3 |
|---|---|---|
| Provider | xAI | Moonshot AI |
| Context Window | 500,000 tokens | 1,048,576 tokens |
| Agent Suitability | N/A | N/A |
| Time to First Token (TTFT) | N/A | N/A |
| Deployment Model | managed api | managed api |
| Production Stability | stable | beta |
| API Available | Yes | Yes |
| Released Date | 2026-07-08 | 2026-07-16 |
API Pricing Comparison
Input Price per Million Tokens
Grok 4.5
$2.00
Kimi K3
$3.00
Output Price per Million Tokens
Grok 4.5
$6.00
Kimi K3
$15.00
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Benchmark Performance Metrics
Scores show the raw performance percentages verified across key evaluation suites. Higher bars indicate superior accuracy and capability in that domain.
Grok 4.5 Quirks & Gotchas
No developer gotchas reported.
Kimi K3 Quirks & Gotchas
No developer gotchas reported.