GPT-5.5 (Xhigh) vs Kimi K3 (Low)
Which is better for the money: GPT-5.5 (Xhigh) by OpenAI or Kimi K3 (Low) by Kimi? Intelligence, total benchmark cost, and end-to-end time from Artificial Analysis & other sources, snapshot 2026-10-25.
Trade-off
Verdict
Depends on your budget
GPT-5.5 (Xhigh) scores 8.3 points higher (38.4 vs 30.1) but costs 4.4× as much to run the benchmark ($5294 vs $1190; flagship vs premium cost classes). They are not alternatives at one budget: pick GPT-5.5 (Xhigh) when you need intelligence above 30.1, and Kimi K3 (Low) when 30.1 is enough.
| Metric | GPT-5.5 (Xhigh) | Kimi K3 (Low) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 38.4 | 30.1 | −21.6% Kimi K3 (Low) is 21.6% less intelligent |
| Total AA cost (lower is better) | $5,294.36 | $1,190.42 | −77.5% Kimi K3 (Low) is 77.5% cheaper |
| End-to-end time (lower is better) | 55.87s | 56.42s | +1.0% Kimi K3 (Low) is 1.0% slower |
| Price per 1M tokens (in / out) | $5.00 / $30.0 | $3.00 / $15.0 | |
| Input modalities | Text, Image | Text, Image |
Kimi K3 (Low) vs GPT-5.5 (Xhigh): 21.6% less intelligence, 77.5% less cost to run the AA benchmark, and 1.0% slower end-to-end.
Today's Pareto frontier
Against the frontier
- GPT-5.5 (Xhigh) is off the frontier: at the same or lower cost, Claude Opus 5.5 (Xhigh, Default Fallback) scores 56.00 for $4057.
- Kimi K3 (Low) is off the frontier: at the same or lower cost, GPT-6.1 Sol (Max) scores 51.80 for $1082.
GPT-5.5 (Xhigh)Kimi K3 (Low)Today's Pareto frontierOpen-weights frontierEvery other model
Matchup
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Accept: text/markdown or ?format=md returns this page as Markdown. JSON: /api/v1/compare/gpt-5-5/kimi-k3-low · Markdown: /api/v1/compare/gpt-5-5/kimi-k3-low?format=md · llms.txt · agent skill