Kimi K3 vs o3 Pro
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 Kimi K3 and o3 Pro.
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...
o3 Pro
The o-series of models are trained with reinforcement learning to think before they answer and perform complex reasoning. The o3-pro model uses more compute to think harder and provide consistently...
Technical Specifications
| Specification | Kimi K3 | o3 Pro |
|---|---|---|
| Provider | Moonshot AI | OpenAI |
| Context Window | 1,048,576 tokens | 200,000 tokens |
| Agent Suitability | N/A | N/A |
| Time to First Token (TTFT) | N/A | N/A |
| Deployment Model | managed api | managed api |
| Production Stability | beta | stable |
| API Available | Yes | Yes |
| Released Date | 2026-07-16 | 2025-06-10 |
API Pricing Comparison
Input Price per Million Tokens
Kimi K3
$3.00
o3 Pro
$20.00
Output Price per Million Tokens
Kimi K3
$15.00
o3 Pro
$80.00
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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.
Kimi K3 Quirks & Gotchas
No developer gotchas reported.
o3 Pro Quirks & Gotchas
No developer gotchas reported.