Claude Sonnet 5.5 (Low, Default Fallback) vs LongCat 2.0
Which is better for the money: Claude Sonnet 5.5 (Low, Default Fallback) by Anthropic or LongCat 2.0 by LongCat? Intelligence, total benchmark cost, and end-to-end time from Artificial Analysis & other sources, snapshot 2026-10-25.
Clear winner
Verdict
Pick Claude Sonnet 5.5 (Low, Default Fallback)
LongCat 2.0 vs Claude Sonnet 5.5 (Low, Default Fallback): 46.8% less intelligence, 13.0% more cost to run the AA benchmark, and 523.9% slower end-to-end.
| Metric | Claude Sonnet 5.5 (Low, Default Fallback) | LongCat 2.0 | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 35.9 | 19.1 | −46.8% LongCat 2.0 is 46.8% less intelligent |
| Total AA cost (lower is better) | $482.13 | $544.74 | +13.0% LongCat 2.0 is 13.0% more expensive |
| End-to-end time (lower is better) | 5.94s | 37.06s | +523.9% LongCat 2.0 is 523.9% slower |
| Price per 1M tokens (in / out) | $2.00 / $10.0 | $0.75 / $2.95 | |
| Input modalities | Text, Image | Text |
Today's Pareto frontier
Against the frontier
- Claude Sonnet 5.5 (Low, Default Fallback) is off the frontier: at the same or lower cost, GPT-6.1 Sol (Medium) scores 47.80 for $361.
- LongCat 2.0 is off the frontier: at the same or lower cost, GPT-6.1 Sol (High) scores 50.20 for $521.
Claude Sonnet 5.5 (Low, Default Fallback)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/claude-sonnet-5-5-low/longcat-2-0 · Markdown: /api/v1/compare/claude-sonnet-5-5-low/longcat-2-0?format=md · llms.txt · agent skill