Claude Sonnet 5.5 (Xhigh, Default Fallback) vs GPT-5.6 Terra (Low)
Which is better for the money: Claude Sonnet 5.5 (Xhigh, Default Fallback) by Anthropic or GPT-5.6 Terra (Low) by OpenAI? Intelligence, total benchmark cost, and end-to-end time from Artificial Analysis & other sources, snapshot 2026-10-27.
Depends on your budget
Claude Sonnet 5.5 (Xhigh, Default Fallb… scores 24.4 points higher (51.9 vs 27.5) but costs 6.2× as much to run the benchmark ($2177 vs $350; flagship vs mid-range cost classes). They are not alternatives at one budget: pick Claude Sonnet 5.5 (Xhigh, Default Fallb… when you need intelligence above 27.5, and GPT-5.6 Terra (Low) when 27.5 is enough.
| Metric | Claude Sonnet 5.5 (Xhigh, Default Fallback) | GPT-5.6 Terra (Low) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 51.9 | 27.5 | −47.0% GPT-5.6 Terra (Low) is 47.0% less intelligent |
| Total AA cost (lower is better) | $2,176.82 | $350.36 | −83.9% GPT-5.6 Terra (Low) is 83.9% cheaper |
| End-to-end time (lower is better) | 34.85s | 5.49s | −84.2% GPT-5.6 Terra (Low) is 84.2% faster |
| Price per 1M tokens (in / out) | $2.00 / $10.0 | $2.00 / $12.0 | |
| Input modalities | Text, Image | Text, Image |
GPT-5.6 Terra (Low) vs Claude Sonnet 5.5 (Xhigh, Default Fallback): 47.0% less intelligence, 83.9% less cost to run the AA benchmark, and 84.2% faster end-to-end.
Against the frontier
- Claude Sonnet 5.5 (Xhigh, Default Fallback) is off the frontier: at the same or lower cost, Claude Opus 5.5 (High, Default Fallback) scores 53.60 for $2172.
- GPT-5.6 Terra (Low) is off the frontier: at the same or lower cost, MiMo-V2.6-Pro scores 46.30 for $207.
Compare something else
Accept: text/markdown or ?format=md returns this page as Markdown. JSON: /api/v1/compare/claude-sonnet-5-5-xhigh/gpt-5-6-terra-low · Markdown: /api/v1/compare/claude-sonnet-5-5-xhigh/gpt-5-6-terra-low?format=md · llms.txt · agent skill