Model Comparison
GPT-5.6 Luna (xhigh)
vs. K3
Comparing 2 AI models · 4 benchmarks · OpenAI, Kimi
Recommended Pick
KiK38 metric winsStrongest on: TTFT, Reasoning, Intelligence
Best Value
GPT-5.6 Luna (xhigh)
100.0 value score
58.1 reasoning / $2.25/1M
Lowest Price
GPT-5.6 Luna (xhigh)
$1.00/1M input price
Best Reasoning
K3
65.0 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-5.6 Luna (xhigh) has the strongest quality-to-price mix at 100.0 out of 100 value points.
Price gap
GPT-5.6 Luna (xhigh) is 3.0x cheaper on input tokens than K3.
Speed gap
GPT-5.6 Luna (xhigh) generates about 3.0x as many tokens per second as K3.
Reasoning gap
K3 leads GPT-5.6 Luna (xhigh) by 6.9 points on reasoning.
Coding gap
K3 leads GPT-5.6 Luna (xhigh) by 7.6 points on coding.
Response Face-Off
Run one prompt through the selected models and compare response quality with live speed and cost context.
GPT-5.6 Luna (xhigh)
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-5.6 Luna (xhigh) | Top Pick Ki K3 |
|---|---|---|
| Pricing per 1M tokens | ||
| Input Cost | $1.00/1M | $3.00/1M |
| Output Cost | $6.00/1M | $15.00/1M |
| Blended (3:1) | $2.25/1M | $6.00/1M |
| Specifications | ||
| Organization | OpenAI | Kimi |
| Release Date | Jul 9, 2026 | Jul 16, 2026 |
| Performance & Speed | ||
| Throughput | 174.3 tok/s | 58.5 tok/s |
| TTFT | 22828ms | 1348ms |
| Latency | 22828ms | 35534ms |
| Composite Indices | ||
| Value Score | 100.0 | 42.0 |
| Reasoning Score | 58.1 | 65.0 |
| Intelligence | 49.1 | 57.1 |
| Coding | 68.6 | 76.2 |
| Standard Benchmarks | ||
| GPQA | 89.5% | 93.5% |
| HLE | 35.6% | 44.3% |
| SciCode | 50.0% | 58.7% |
| LCR | 69.7% | 74.7% |
Key Takeaways
GPT-5.6 Luna (xhigh) offers the best value at $1.00/1M,making it ideal for high-volume applications and cost-conscious projects.
K3 has the strongest reasoning profile with a 65.0 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-5.6 Luna (xhigh)
- Cost-sensitive applications
- High-volume processing
K3
- Complex reasoning tasks
- Research & analysis
- Code generation
- Software development
