Key Takeaways
Kimi K2 Thinking wins:
- Cheaper input tokens
- Cheaper output tokens
- Larger context window
- Has reasoning mode
ChatGPT-4o wins:
- Faster response time
- Higher intelligence benchmark
- Better at math
- Supports vision
Price Advantage
Kimi K2 Thinking
Benchmark Advantage
ChatGPT-4o
Context Window
Kimi K2 Thinking
Speed
ChatGPT-4o
Pricing Comparison
Price Comparison
| Metric | Kimi K2 Thinking | ChatGPT-4o | Winner |
|---|---|---|---|
| Input (per 1M tokens) | $0.47 | $5.00 | Kimi K2 Thinking |
| Output (per 1M tokens) | $2.00 | $15.00 | Kimi K2 Thinking |
| Cache Read (per 1M) | $0.14 | N/A | Kimi K2 Thinking |
Using a 3:1 input/output ratio, Kimi K2 Thinking is 89% cheaper overall.
Kimi K2 Thinking Providers
No provider data available
ChatGPT-4o Providers
No provider data available
Benchmark Comparison
7
Benchmarks Compared
0
Kimi K2 Thinking Wins
0
ChatGPT-4o Wins
Benchmark Scores
| Benchmark | Kimi K2 Thinking | ChatGPT-4o | Winner |
|---|---|---|---|
Intelligence Index Overall intelligence score | - | 18.6 | - |
Math Index Mathematical reasoning | - | 25.7 | - |
MMLU Pro Academic knowledge | - | 80.3 | - |
GPQA Graduate-level science | - | 65.5 | - |
LiveCodeBench Competitive programming | - | 42.5 | - |
Aider Real-world code editing | - | 72.2 | - |
AIME Competition math | - | 32.7 | - |
ChatGPT-4o shows stronger mathematical reasoning abilities.
Cost vs Quality
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Kimi K2 Thinking
Other models
Context & Performance
Context Window
Kimi K2 Thinking
131,072
tokens
ChatGPT-4o
128,000
tokens
Kimi K2 Thinking has a 2% larger context window.
Speed Performance
| Metric | Kimi K2 Thinking | ChatGPT-4o | Winner |
|---|---|---|---|
| Tokens/second | N/A | 0.0 tok/s | |
| Time to First Token | N/A | 0.00s |
Capabilities
Feature Comparison
| Feature | Kimi K2 Thinking | ChatGPT-4o |
|---|---|---|
| Vision (Image Input) | ||
| Tool/Function Calls | ||
| Reasoning Mode | ||
| Audio Input | ||
| Audio Output | ||
| PDF Input | ||
| Prompt Caching | ||
| Web Search |
License & Release
| Property | Kimi K2 Thinking | ChatGPT-4o |
|---|---|---|
| License | Open Source | Proprietary |
| Author | Moonshotai | OpenAI |
| Released | Nov 2025 | Unknown |
Kimi K2 Thinking Modalities
Input
text
Output
text
ChatGPT-4o Modalities
Input
Output