GPT-5.5 (Medium) vs LongCat 2.0
Which is better for the money: GPT-5.5 (Medium) by OpenAI or LongCat 2.0 by LongCat? Intelligence, total benchmark cost, and end-to-end time from Artificial Analysis & other sources, snapshot 2026-10-24.
Trade-off
Verdict
Depends on your budget
GPT-5.5 (Medium) scores 14.7 points higher (33.8 vs 19.1) but costs 3.8× as much to run the benchmark ($2095 vs $545; flagship vs premium cost classes). They are not alternatives at one budget: pick GPT-5.5 (Medium) when you need intelligence above 19.1, and LongCat 2.0 when 19.1 is enough.
| Metric | GPT-5.5 (Medium) | LongCat 2.0 | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 33.8 | 19.1 | −43.5% LongCat 2.0 is 43.5% less intelligent |
| Total AA cost (lower is better) | $2,095.12 | $544.74 | −74.0% LongCat 2.0 is 74.0% cheaper |
| End-to-end time (lower is better) | 9.73s | 35.54s | +265.3% LongCat 2.0 is 265.3% slower |
| Price per 1M tokens (in / out) | $5.00 / $30.0 | $0.75 / $2.95 | |
| Input modalities | Text, Image | Text |
LongCat 2.0 vs GPT-5.5 (Medium): 43.5% less intelligence, 74.0% less cost to run the AA benchmark, and 265.3% 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, GPT-6.1 Sol (Max) scores 51.80 for $1082.
- LongCat 2.0 is off the frontier: at the same or lower cost, GPT-6.1 Sol (High) scores 50.20 for $521.
GPT-5.5 (Medium)LongCat 2.0Today'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/longcat-2-0 · Markdown: /api/v1/compare/gpt-5-5-medium/longcat-2-0?format=md · llms.txt · agent skill