Model Comparison
GPT-5 (ChatGPT)
vs. Kimi K2
Comparing 2 AI models · 12 benchmarks · OpenAI, MoonshotAI
Recommended Pick
Mo Kimi K2 15 metric wins Strongest on: Value, Input price, Output price
Best Value
Kimi K2
100.0 value score
55.8 reasoning / $1.04/1M
Lowest Price
Kimi K2
$0.58/1M input price
Best Reasoning
Kimi K2
55.8 reasoning score
Blends available reasoning benchmarks
Best for Coding
Kimi K2
22.1 coding index
Composite Indices
Higher is better; speed and price are normalized
Standard Benchmarks
Only benchmarks with data are shown
Differences That Matter
Best value
Kimi K2 has the strongest quality-to-price mix at 100.0 out of 100 value points.
Price gap
Kimi K2 is 2.1x cheaper on input tokens than GPT-5 (ChatGPT).
Speed gap
GPT-5 (ChatGPT) generates about 7.6x as many tokens per second as Kimi K2.
Reasoning gap
Kimi K2 leads GPT-5 (ChatGPT) by 17.2 points on reasoning.
Coding gap
Kimi K2 leads GPT-5 (ChatGPT) by 0.9 points on coding.
Response Face-Off
Run one prompt through the selected models and compare response quality with live speed and cost context.
GPT-5 (ChatGPT)
OpenAI
TTFT
—
Time
—
tok/s
—
Tokens
—
Cost
—
Kimi K2
MoonshotAI
TTFT
—
Time
—
tok/s
—
Tokens
—
Cost
—
Which answer was more useful?
Full Comparison
| Metric | Op GPT-5 (ChatGPT) | Top Pick Mo Kimi K2 |
|---|---|---|
| Pricing per 1M tokens | ||
| Input Cost | $1.25/1M | $0.58/1M |
| Output Cost | $10.00/1M | $2.40/1M |
| Blended (3:1) | $3.44/1M | $1.04/1M |
| Specifications | ||
| Organization | OpenAI | MoonshotAI |
| Release Date | Aug 7, 2025 | Jul 11, 2025 |
| Performance & Speed | ||
| Throughput | 187.2 tok/s | 24.7 tok/s |
| TTFT | 557ms | 1552ms |
| Latency | 557ms | 1552ms |
| Composite Indices | ||
| Value Score | 20.9 | 100.0 |
| Reasoning Score | 38.6 | 55.8 |
| Intelligence | 21.8 | 26.3 |
| Coding | 21.2 | 22.1 |
| Math | 48.3 | 57.0 |
| Standard Benchmarks | ||
| GPQA | 68.6% | 76.6% |
| MMLU Pro | 82.0% | 82.4% |
| HLE | 5.8% | 7.0% |
| LiveCodeBench | 54.3% | 55.6% |
| MATH 500 | — | 97.1% |
| AIME 2025 | 48.3% | 57.0% |
| AIME (Original) | — | 69.3% |
| SciCode | 37.8% | 34.5% |
| LCR | 63.7% | 51.0% |
| IFBench | 45.0% | 41.5% |
| TAU-bench v2 | 0.0% | 61.1% |
| TerminalBench Hard | 12.9% | 15.9% |
Key Takeaways
Kimi K2 offers the best value at $0.58/1M, making it ideal for high-volume applications and cost-conscious projects.
Kimi K2 has the strongest reasoning profile with a 55.8 reasoning score, combining the available reasoning-heavy benchmarks.
Kimi K2 reaches a 22.1 coding index, making it the top choice for software development and code generation tasks.
All models support context windows of ∞+ tokens, suitable for processing lengthy documents and maintaining extended conversations.
When to Choose Each Model
GPT-5 (ChatGPT)
- General-purpose AI
- Versatile applications
Kimi K2
- Cost-sensitive applications
- High-volume processing
- Complex reasoning tasks
- Research & analysis
- Code generation
- Software development
