Model Comparison
GPT-5 (high)
vs. K3
Comparing 2 AI models · 12 benchmarks · OpenAI, Kimi
Recommended Pick
KiK37 metric winsStrongest on: TTFT, Latency, Intelligence
Best Value
GPT-5 (high)
100.0 value score
75.8 reasoning / $3.44/1M
Lowest Price
GPT-5 (high)
$1.25/1M input price
Best Reasoning
GPT-5 (high)
75.8 reasoning score
Blends available reasoning benchmarks
Best for Coding
K3
76.2 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
GPT-5 (high) has the strongest quality-to-price mix at 100.0 out of 100 value points.
Price gap
GPT-5 (high) is 2.4x cheaper on input tokens than K3.
Speed gap
GPT-5 (high) generates about 2.9x as many tokens per second as K3.
Reasoning gap
GPT-5 (high) leads K3 by 10.8 points on reasoning.
Coding gap
K3 leads GPT-5 (high) by 38.4 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 (high)
OpenAI
TTFT
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Time
—
tok/s
—
Tokens
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Cost
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K3
Kimi
TTFT
—
Time
—
tok/s
—
Tokens
—
Cost
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Which answer was more useful?
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Full Comparison
| Metric | Op GPT-5 (high) | Top Pick Ki K3 |
|---|---|---|
| Pricing per 1M tokens | ||
| Input Cost | $1.25/1M | $3.00/1M |
| Output Cost | $10.00/1M | $15.00/1M |
| Blended (3:1) | $3.44/1M | $6.00/1M |
| Specifications | ||
| Organization | OpenAI | Kimi |
| Release Date | Aug 7, 2025 | Jul 16, 2026 |
| Performance & Speed | ||
| Throughput | 112.4 tok/s | 39.4 tok/s |
| TTFT | 85333ms | 2615ms |
| Latency | 85333ms | 53393ms |
| Composite Indices | ||
| Value Score | 100.0 | 49.1 |
| Reasoning Score | 75.8 | 65.0 |
| Intelligence | 34.7 | 57.1 |
| Coding | 37.8 | 76.2 |
| Math | 94.3 | — |
| Standard Benchmarks | ||
| GPQA | 85.4% | 93.5% |
| MMLU Pro | 87.1% | — |
| HLE | 26.5% | 44.3% |
| LiveCodeBench | 84.6% | — |
| MATH 500 | 99.4% | — |
| AIME 2025 | 94.3% | — |
| AIME (Original) | 95.7% | — |
| SciCode | 42.9% | 58.7% |
| LCR | 75.6% | 74.7% |
| IFBench | 73.1% | — |
| TAU-bench v2 | 84.8% | — |
| TerminalBench Hard | 32.6% | — |
Key Takeaways
GPT-5 (high) offers the best value at $1.25/1M,making it ideal for high-volume applications and cost-conscious projects.
GPT-5 (high) has the strongest reasoning profile with a 75.8 reasoning score,combining the available reasoning-heavy benchmarks.
K3 reaches a 76.2 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 (high)
- Cost-sensitive applications
- High-volume processing
- Complex reasoning tasks
- Research & analysis
K3
- Code generation
- Software development
