GPT-5.5 Instant (June 2026) vs Kimi K3.1 Pro
Which is better for the money: GPT-5.5 Instant (June 2026) by OpenAI or Kimi K3.1 Pro by Kimi? Intelligence, total benchmark cost, and end-to-end time from Artificial Analysis & other sources, snapshot 2026-10-27.
Trade-off
Verdict
Depends on your budget
Kimi K3.1 Pro scores 29.1 points higher (55.1 vs 26.0) but costs 3.2× as much to run the benchmark ($3117 vs $987; flagship vs premium cost classes). They are not alternatives at one budget: pick Kimi K3.1 Pro when you need intelligence above 26.0, and GPT-5.5 Instant (June 2026) when 26.0 is enough.
| Metric | GPT-5.5 Instant (June 2026) | Kimi K3.1 Pro | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 26.0 | 55.1 | +111.9% Kimi K3.1 Pro is 2.1× more intelligent |
| Total AA cost (lower is better) | $986.85 | $3,117.31 | +215.9% Kimi K3.1 Pro is 3.2× more expensive |
| End-to-end time (lower is better) | 16.20s | 59.28s | +265.9% Kimi K3.1 Pro is 265.9% slower |
| Price per 1M tokens (in / out) | $5.00 / $30.0 | $2.00 / $10.0 | |
| Input modalities | Text, Image | Text, Image |
Kimi K3.1 Pro vs GPT-5.5 Instant (June 2026): 111.9% more intelligence, 215.9% more cost to run the AA benchmark, and 265.9% slower end-to-end.
Today's Pareto frontier
Against the frontier
- GPT-5.5 Instant (June 2026) is off the frontier: at the same or lower cost, GPT-6.1 Sol (Xhigh) scores 51.00 for $662.
- Kimi K3.1 Pro is on today's frontier: nothing is both smarter and cheaper.
GPT-5.5 Instant (June 2026)Kimi K3.1 ProToday's Pareto 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-instant-06-26/kimi-k3-1-pro · Markdown: /api/v1/compare/gpt-5-5-instant-06-26/kimi-k3-1-pro?format=md · llms.txt · agent skill