Claude Sonnet 5 (Xhigh) vs LongCat 2.0
Which is better for the money: Claude Sonnet 5 (Xhigh) 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.
Trade-off
Verdict
Depends on your budget
Claude Sonnet 5 (Xhigh) scores 15.3 points higher (34.4 vs 19.1) but costs 6.0× as much to run the benchmark ($3255 vs $545; flagship vs premium cost classes). They are not alternatives at one budget: pick Claude Sonnet 5 (Xhigh) when you need intelligence above 19.1, and LongCat 2.0 when 19.1 is enough.
| Metric | Claude Sonnet 5 (Xhigh) | LongCat 2.0 | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 34.4 | 19.1 | −44.5% LongCat 2.0 is 44.5% less intelligent |
| Total AA cost (lower is better) | $3,255.40 | $544.74 | −83.3% LongCat 2.0 is 83.3% cheaper |
| End-to-end time (lower is better) | 26.92s | 37.06s | +37.7% LongCat 2.0 is 37.7% slower |
| Price per 1M tokens (in / out) | $2.00 / $10.0 | $0.75 / $2.95 | |
| Input modalities | Text, Image | Text |
LongCat 2.0 vs Claude Sonnet 5 (Xhigh): 44.5% less intelligence, 83.3% less cost to run the AA benchmark, and 37.7% slower end-to-end.
Today's Pareto frontier
Against the frontier
- Claude Sonnet 5 (Xhigh) is off the frontier: at the same or lower cost, Kimi K3.1 Pro scores 55.10 for $3117.
- 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 (Xhigh)LongCat 2.0Today's Pareto frontierOpen-weights frontierEvery other model
Matchup
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