Claude Sonnet 5 (Low) vs LongCat 2.0
Which is better for the money: Claude Sonnet 5 (Low) 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 (Low) scores 5.2 points higher (24.3 vs 19.1) but costs 1.2× as much to run the benchmark ($653 vs $545; both premium class). Pick Claude Sonnet 5 (Low) when the extra intelligence is worth the premium, otherwise LongCat 2.0.
| Metric | Claude Sonnet 5 (Low) | LongCat 2.0 | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 24.3 | 19.1 | −21.4% LongCat 2.0 is 21.4% less intelligent |
| Total AA cost (lower is better) | $652.70 | $544.74 | −16.5% LongCat 2.0 is 16.5% cheaper |
| End-to-end time (lower is better) | 8.35s | 35.69s | +327.4% LongCat 2.0 is 327.4% 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 (Low): 21.4% less intelligence, 16.5% less cost to run the AA benchmark, and 327.4% slower end-to-end.
Today's Pareto frontier
Against the frontier
- Claude Sonnet 5 (Low) is off the frontier: at the same or lower cost, GPT-6.1 Sol (High) scores 50.20 for $521.
- 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 (Low)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-low/longcat-2-0 · Markdown: /api/v1/compare/claude-sonnet-5-low/longcat-2-0?format=md · llms.txt · agent skill