Compare · updated 2026-11-01
GPT-6 Luna vs Kimi K3.1 Pro
GPT-6 Luna is better at quick answers, structured data; Kimi K3.1 Pro is better at writing, coding, reasoning, maths, long documents, translation. GPT-6 Luna is the cheaper of the two on output.
Measured quality by task
| Task | GPT-6 Luna | Kimi K3.1 Pro | Better |
|---|---|---|---|
| Quick answers | 93/100 | 91/100 | GPT-6 Luna |
| Writing | 90/100 | 92/100 | Kimi K3.1 Pro |
| Coding | 84/100 | 89/100 | Kimi K3.1 Pro |
| Reasoning | 77/100 | 85/100 | Kimi K3.1 Pro |
| Maths | 70/100 | 81/100 | Kimi K3.1 Pro |
| Structured data | 93/100 | 92/100 | GPT-6 Luna |
| Long documents | 88/100 | 90/100 | Kimi K3.1 Pro |
| Translation | 90/100 | 91/100 | Kimi K3.1 Pro |
Quality is Nivana’s measured score for each kind of task, from weekly pairwise evals judged by models from several labs. Prices are live AI Gateway list prices per million tokens. Updated 2026-11-01. How this is measured.
Price and context
| GPT-6 Luna | Kimi K3.1 Pro | |
|---|---|---|
| Lab | OpenAI | Moonshot |
| Input per 1M tokens | $0.1 | $2 |
| Output per 1M tokens | $0.5 | $10 |
| Typical chat answer | $0.00050 | $0.010 |
| Context window | 1.05M | 1.05M |
| Router picks it for | 16 of 24 request types | Fallback only |
Which should you use?
Use the one that wins the kind of work you do most, unless the price gap outweighs the quality gap for easy requests. Or don’t choose: Nivana scores both, and the rest of the pool, on every request and sends it to whichever is best for that request.
Questions
Is GPT-6 Luna better than Kimi K3.1 Pro?
On Nivana’s weekly evals GPT-6 Luna scores higher on 2 of 8 task types (quick answers, structured data) and Kimi K3.1 Pro on 6 (writing, coding, reasoning, maths, long documents, translation). Neither is better at everything.
Which is better for coding, GPT-6 Luna or Kimi K3.1 Pro?
Kimi K3.1 Pro: 89/100 against 84/100 for GPT-6 Luna on Nivana’s coding evals.
Which is better for writing, GPT-6 Luna or Kimi K3.1 Pro?
Kimi K3.1 Pro: 92/100 against 90/100 for GPT-6 Luna on Nivana’s writing evals.
Which is cheaper, GPT-6 Luna or Kimi K3.1 Pro?
GPT-6 Luna: $0.5 per million output tokens against $10 for Kimi K3.1 Pro, about 20.0× less. A typical chat answer costs about $0.0005 on GPT-6 Luna and $0.010 on Kimi K3.1 Pro.
Or let the router pick, per request
Nivana sends every message to the model that scores best for it, sets how hard it thinks, and tells you which one answered. 2,000 free credits to start, no card.