Key Takeaways
Kimi K2.5 wins:
- Cheaper input tokens
- Cheaper output tokens
- Larger context window
- Faster response time
Grok 4 wins:
- Higher intelligence benchmark
- Better at coding
- Better at math
- Supports tool calls
Price Advantage
Kimi K2.5
Benchmark Advantage
Grok 4
Context Window
Kimi K2.5
Speed
Kimi K2.5
Pricing Comparison
Price Comparison
| Metric | Kimi K2.5 | Grok 4 | Winner |
|---|---|---|---|
| Input (per 1M tokens) | $0.50 | $3.00 | Kimi K2.5 |
| Output (per 1M tokens) | $2.80 | $15.00 | Kimi K2.5 |
| Cache Read (per 1M) | N/A | $750000.00 | Grok 4 |
Using a 3:1 input/output ratio, Kimi K2.5 is 82% cheaper overall.
Kimi K2.5 Providers
Together $0.50 (Cheapest)
AtlasCloud $0.56
GMICloud $0.57
Novita $0.57
Parasail $0.60
Grok 4 Providers
Vercel $3.00 (Cheapest)
xAI $3.00 (Cheapest)
Benchmark Comparison
8
Benchmarks Compared
0
Kimi K2.5 Wins
3
Grok 4 Wins
Benchmark Scores
| Benchmark | Kimi K2.5 | Grok 4 | Winner |
|---|---|---|---|
Intelligence Index Overall intelligence score | 37.2 | 41.4 | |
Coding Index Code generation & understanding | 25.8 | 40.5 | |
Math Index Mathematical reasoning | - | 92.7 | - |
MMLU Pro Academic knowledge | - | 86.6 | - |
GPQA Graduate-level science | 78.9 | 87.7 | |
LiveCodeBench Competitive programming | - | 81.9 | - |
Aider Real-world code editing | - | 79.6 | - |
AIME Competition math | - | 94.3 | - |
Grok 4 significantly outperforms in coding benchmarks.
Cost vs Quality
X-axis:
Y-axis:
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Other models
Context & Performance
Context Window
Kimi K2.5
262,144
tokens
Grok 4
256,000
tokens
Kimi K2.5 has a 2% larger context window.
Speed Performance
| Metric | Kimi K2.5 | Grok 4 | Winner |
|---|---|---|---|
| Tokens/second | 106.7 tok/s | 33.9 tok/s | |
| Time to First Token | 0.87s | 8.24s |
Kimi K2.5 responds 215% faster on average.
Capabilities
Feature Comparison
| Feature | Kimi K2.5 | Grok 4 |
|---|---|---|
| Vision (Image Input) | ||
| Tool/Function Calls | ||
| Reasoning Mode | ||
| Audio Input | ||
| Audio Output | ||
| PDF Input | ||
| Prompt Caching | ||
| Web Search |
License & Release
| Property | Kimi K2.5 | Grok 4 |
|---|---|---|
| License | Proprietary | Proprietary |
| Author | Moonshotai | Xai |
| Released | Jan 2026 | Jul 2025 |
Kimi K2.5 Modalities
Input
textimage
Output
text
Grok 4 Modalities
Input
imagetext
Output
text