GPT-5.5 (Medium) vs Kimi K3 (Max)

Which is better for the money: GPT-5.5 (Medium) by OpenAI or Kimi K3 (Max) by Kimi? Intelligence, total benchmark cost, and end-to-end time from Artificial Analysis & other sources, snapshot 2026-10-24.

Trade-off

OpenAIGPT-5.5 (Medium)Off the frontier

Intelligence: 33.80
Total cost: $2095

KimiKimi K3 (Max)Off the frontier

Intelligence: 43.60
Total cost: $3658

Verdict

Depends on your budget

Kimi K3 (Max) scores 9.8 points higher (43.6 vs 33.8) but costs 1.7× as much to run the benchmark ($3658 vs $2095; both flagship class). Pick Kimi K3 (Max) when the extra intelligence is worth the premium, otherwise GPT-5.5 (Medium).

Metric	GPT-5.5 (Medium)	Kimi K3 (Max)	Difference
Intelligence (higher is better)	33.8	43.6	+29.0% Kimi K3 (Max) is 29.0% more intelligent
Total AA cost (lower is better)	$2,095.12	$3,658.07	+74.6% Kimi K3 (Max) is 74.6% more expensive
End-to-end time (lower is better)	9.73s	63.08s	+548.3% Kimi K3 (Max) is 548.3% slower
Price per 1M tokens (in / out)	$5.00 / $30.0	$3.00 / $15.0
Input modalities	Text, Image	Text, Image

Kimi K3 (Max) vs GPT-5.5 (Medium): 29.0% more intelligence, 74.6% more cost to run the AA benchmark, and 548.3% slower end-to-end.

Open this matchup in the interactive picker GPT-5.5 (Medium): what beats it Kimi K3 (Max): what beats it

Today's Pareto frontier

Against the frontier

GPT-5.5 (Medium) is off the frontier: at the same or lower cost, GPT-6.1 Sol (Max) scores 51.80 for $1082.
Kimi K3 (Max) is off the frontier: at the same or lower cost, Kimi K3.1 Pro scores 55.10 for $3117.

GPT-5.5 (Medium)Kimi K3 (Max)Today's Pareto frontierOpen-weights frontierEvery other model

Matchup

Compare something else

Agents: Accept: text/markdown or ?format=md returns this page as Markdown. JSON: /api/v1/compare/gpt-5-5-medium/kimi-k3 · Markdown: /api/v1/compare/gpt-5-5-medium/kimi-k3?format=md · llms.txt · agent skill