GPT-5.5 (medium) vs Kimi K2.7 Code
Which is better for the money: GPT-5.5 (medium) by OpenAI or Kimi K2.7 Code by Kimi? Intelligence, total benchmark cost, and end-to-end time from Artificial Analysis & other sources, snapshot 2026-09-09.
Trade-off
Verdict
Depends on your budget
GPT-5.5 (medium) scores 7.9 points higher (34.2 vs 26.3) but costs 2.1× as much to run the benchmark ($2095 vs $993; flagship vs premium cost classes). Pick GPT-5.5 (medium) when the extra intelligence is worth the premium, otherwise Kimi K2.7 Code.
| Metric | GPT-5.5 (medium) | Kimi K2.7 Code | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 34.2 | 26.3 | −23.1% Kimi K2.7 Code is 23.1% less intelligent |
| Total AA cost (lower is better) | $2,095.12 | $992.88 | −52.6% Kimi K2.7 Code is 52.6% cheaper |
| End-to-end time (lower is better) | 11.45s | 41.22s | +260.0% Kimi K2.7 Code is 260.0% slower |
| Price per 1M tokens (in / out) | $5.00 / $30.0 | $0.95 / $4.00 | |
| Input modalities | Not reported | Not reported |
Kimi K2.7 Code vs GPT-5.5 (medium): 23.1% less intelligence, 52.6% less cost to run the AA benchmark, and 260.0% slower end-to-end.
Today's Pareto frontier
Against the frontier
- GPT-5.5 (medium) is off the frontier: at the same or lower cost, Muse Spark 1.3 (max) scores 48.20 for $2000.
- Kimi K2.7 Code is off the frontier: at the same or lower cost, GLM-5.3-Flash scores 41.90 for $280.
GPT-5.5 (medium)Kimi K2.7 CodeToday'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-medium/kimi-k2-7-code · Markdown: /api/v1/compare/gpt-5-5-medium/kimi-k2-7-code?format=md · llms.txt · agent skill