Key Takeaways
Kimi K2 Thinking wins:
- Cheaper input tokens
- Larger context window
- Faster response time
- Higher intelligence benchmark
- Better at coding
- Better at math
- Has reasoning mode
Step3 wins:
- Cheaper output tokens
- Supports vision
Price Advantage
Kimi K2 Thinking
Benchmark Advantage
Kimi K2 Thinking
Context Window
Kimi K2 Thinking
Speed
Kimi K2 Thinking
Pricing Comparison
Price Comparison
| Metric | Kimi K2 Thinking | Step3 | Winner |
|---|---|---|---|
| Input (per 1M tokens) | $0.40 | $0.57 | Kimi K2 Thinking |
| Output (per 1M tokens) | $1.75 | $1.42 | Step3 |
Using a 3:1 input/output ratio, Kimi K2 Thinking is 6% cheaper overall.
Kimi K2 Thinking Providers
Chutes $0.40 (Cheapest)
DeepInfra $0.47
Parasail $0.50
SiliconFlow $0.55
AtlasCloud $0.60
Step3 Providers
SiliconFlow $0.57 (Cheapest)
Benchmark Comparison
6
Benchmarks Compared
0
Kimi K2 Thinking Wins
0
Step3 Wins
Benchmark Scores
| Benchmark | Kimi K2 Thinking | Step3 | Winner |
|---|---|---|---|
Intelligence Index Overall intelligence score | 40.7 | - | - |
Coding Index Code generation & understanding | 34.8 | - | - |
Math Index Mathematical reasoning | 94.7 | - | - |
MMLU Pro Academic knowledge | 84.8 | - | - |
GPQA Graduate-level science | 83.8 | - | - |
LiveCodeBench Competitive programming | 85.3 | - | - |
Kimi K2 Thinking significantly outperforms in coding benchmarks.
Cost vs Quality
X-axis:
Y-axis:
Loading chart...
Kimi K2 Thinking
Other models
Context & Performance
Context Window
Kimi K2 Thinking
262,144
tokens
Max output: 65,535 tokens
Step3
65,536
tokens
Max output: 65,536 tokens
Kimi K2 Thinking has a 75% larger context window.
Speed Performance
| Metric | Kimi K2 Thinking | Step3 | Winner |
|---|---|---|---|
| Tokens/second | 95.3 tok/s | N/A | |
| Time to First Token | 0.60s | N/A |
Capabilities
Feature Comparison
| Feature | Kimi K2 Thinking | Step3 |
|---|---|---|
| Vision (Image Input) | ||
| Tool/Function Calls | ||
| Reasoning Mode | ||
| Audio Input | ||
| Audio Output | ||
| PDF Input | ||
| Prompt Caching | ||
| Web Search |
License & Release
| Property | Kimi K2 Thinking | Step3 |
|---|---|---|
| License | Proprietary | Proprietary |
| Author | Moonshotai | Stepfun-ai |
| Released | Nov 2025 | Aug 2025 |
Kimi K2 Thinking Modalities
Input
text
Output
text
Step3 Modalities
Input
imagetext
Output
text