Claude Opus 5.5 (Medium, Default Fallback) vs GPT-6.1 Terra (Medium)
Which is better for the money: Claude Opus 5.5 (Medium, Default Fallback) by Anthropic or GPT-6.1 Terra (Medium) 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 Opus 5.5 (Medium, Default Fallba… scores 9.9 points higher (51.2 vs 41.3) but costs 9.3× as much to run the benchmark ($1627 vs $175; premium vs mid-range cost classes). They are not alternatives at one budget: pick Claude Opus 5.5 (Medium, Default Fallba… when you need intelligence above 41.3, and GPT-6.1 Terra (Medium) when 41.3 is enough.
| Metric | Claude Opus 5.5 (Medium, Default Fallback) | GPT-6.1 Terra (Medium) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 51.2 | 41.3 | −19.3% GPT-6.1 Terra (Medium) is 19.3% less intelligent |
| Total AA cost (lower is better) | $1,626.81 | $175.20 | −89.2% GPT-6.1 Terra (Medium) is 89.2% cheaper |
| End-to-end time (lower is better) | 24.66s | 6.93s | −71.9% GPT-6.1 Terra (Medium) is 71.9% faster |
| Price per 1M tokens (in / out) | $4.00 / $20.0 | $1.00 / $5.00 | |
| Input modalities | Text, Image | Text, Image |
GPT-6.1 Terra (Medium) vs Claude Opus 5.5 (Medium, Default Fallback): 19.3% less intelligence, 89.2% less cost to run the AA benchmark, and 71.9% faster end-to-end.
Against the frontier
- Claude Opus 5.5 (Medium, Default Fallback) is off the frontier: at the same or lower cost, GPT-6.1 Sol (Max) scores 51.80 for $1082.
- GPT-6.1 Terra (Medium) is on today's frontier: nothing is both smarter and cheaper.
Compare something else
Accept: text/markdown or ?format=md returns this page as Markdown. JSON: /api/v1/compare/claude-opus-5-5-medium/gpt-6-1-terra-medium · Markdown: /api/v1/compare/claude-opus-5-5-medium/gpt-6-1-terra-medium?format=md · llms.txt · agent skill