Claude Opus 5.5 (High, Default Fallback) vs Claude Sonnet 5.5 (Low, Default Fallback)
Which is better for the money: Claude Opus 5.5 (High, Default Fallback) by Anthropic or Claude Sonnet 5.5 (Low, Default Fallback) by Anthropic? Intelligence, total benchmark cost, and end-to-end time from Artificial Analysis & other sources, snapshot 2026-10-24.
Depends on your budget
Claude Opus 5.5 (High, Default Fallback) scores 17.7 points higher (53.6 vs 35.9) but costs 4.5× as much to run the benchmark ($2172 vs $482; flagship vs mid-range cost classes). They are not alternatives at one budget: pick Claude Opus 5.5 (High, Default Fallback) when you need intelligence above 35.9, and Claude Sonnet 5.5 (Low, Default Fallbac… when 35.9 is enough.
| Metric | Claude Opus 5.5 (High, Default Fallback) | Claude Sonnet 5.5 (Low, Default Fallback) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 53.6 | 35.9 | −33.0% Claude Sonnet 5.5 (Lo… is 33.0% less intelligent |
| Total AA cost (lower is better) | $2,172.43 | $482.13 | −77.8% Claude Sonnet 5.5 (Lo… is 77.8% cheaper |
| End-to-end time (lower is better) | 33.81s | 6.19s | −81.7% Claude Sonnet 5.5 (Lo… is 81.7% faster |
| Price per 1M tokens (in / out) | $4.00 / $20.0 | $2.00 / $10.0 | |
| Input modalities | Text, Image | Text, Image |
Claude Sonnet 5.5 (Low, Default Fallback) vs Claude Opus 5.5 (High, Default Fallback): 33.0% less intelligence, 77.8% less cost to run the AA benchmark, and 81.7% faster end-to-end.
Against the frontier
- Claude Opus 5.5 (High, Default Fallback) is on today's frontier: nothing is both smarter and cheaper.
- 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.
Compare something else
Accept: text/markdown or ?format=md returns this page as Markdown. JSON: /api/v1/compare/claude-opus-5-5-high/claude-sonnet-5-5-low · Markdown: /api/v1/compare/claude-opus-5-5-high/claude-sonnet-5-5-low?format=md · llms.txt · agent skill