GPT-5.6 Luna (Medium) vs Kimi K3.1 Pro
Which is better for the money: GPT-5.6 Luna (Medium) by OpenAI or Kimi K3.1 Pro by Kimi? Intelligence, total benchmark cost, and end-to-end time from Artificial Analysis & other sources, snapshot 2026-10-26.
Trade-off
Verdict
Depends on your budget
Kimi K3.1 Pro scores 30.1 points higher (55.1 vs 25.0) but costs 70× as much to run the benchmark ($3117 vs $44.3; flagship vs budget cost classes). They are not alternatives at one budget: pick Kimi K3.1 Pro when you need intelligence above 25.0, and GPT-5.6 Luna (Medium) when 25.0 is enough.
| Metric | GPT-5.6 Luna (Medium) | Kimi K3.1 Pro | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 25.0 | 55.1 | +120.4% Kimi K3.1 Pro is 2.2× more intelligent |
| Total AA cost (lower is better) | $44.32 | $3,117.31 | +6933.6% Kimi K3.1 Pro is 70× more expensive |
| End-to-end time (lower is better) | 6.43s | 51.57s | +702.0% Kimi K3.1 Pro is 702.0% slower |
| Price per 1M tokens (in / out) | $0.20 / $1.20 | $2.00 / $10.0 | |
| Input modalities | Text, Image | Text, Image |
Kimi K3.1 Pro vs GPT-5.6 Luna (Medium): 120.4% more intelligence, 6933.6% more cost to run the AA benchmark, and 702.0% slower end-to-end.
Today's Pareto frontier
Against the frontier
- GPT-5.6 Luna (Medium) is off the frontier: at the same or lower cost, GPT-6 Luna (Medium) scores 29.90 for $31.2.
- Kimi K3.1 Pro is on today's frontier: nothing is both smarter and cheaper.
GPT-5.6 Luna (Medium)Kimi K3.1 ProToday's Pareto frontierEvery other model
Matchup
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Accept: text/markdown or ?format=md returns this page as Markdown. JSON: /api/v1/compare/gpt-5-6-luna-medium/kimi-k3-1-pro · Markdown: /api/v1/compare/gpt-5-6-luna-medium/kimi-k3-1-pro?format=md · llms.txt · agent skill