Claude Opus 5.5 (Low, Default Fallback) vs GPT-6.1 Terra (Medium)
Which is better for the money: Claude Opus 5.5 (Low, 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.
Trade-off
Verdict
Depends on your budget
Claude Opus 5.5 (Low, Default Fallback) scores 1.0 points higher (42.3 vs 41.3) but costs 4.9× as much to run the benchmark ($860 vs $175; premium vs mid-range cost classes). They are not alternatives at one budget: pick Claude Opus 5.5 (Low, Default Fallback) when you need intelligence above 41.3, and GPT-6.1 Terra (Medium) when 41.3 is enough.
| Metric | Claude Opus 5.5 (Low, Default Fallback) | GPT-6.1 Terra (Medium) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 42.3 | 41.3 | −2.4% GPT-6.1 Terra (Medium) is 2.4% less intelligent |
| Total AA cost (lower is better) | $860.33 | $175.20 | −79.6% GPT-6.1 Terra (Medium) is 79.6% cheaper |
| End-to-end time (lower is better) | 13.19s | 6.95s | −47.3% GPT-6.1 Terra (Medium) is 47.3% 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 (Low, Default Fallback): 2.4% less intelligence, 79.6% less cost to run the AA benchmark, and 47.3% faster end-to-end.
Today's Pareto frontier
Against the frontier
- Claude Opus 5.5 (Low, Default Fallback) is off the frontier: at the same or lower cost, GPT-6.1 Sol (Xhigh) scores 51.00 for $662.
- GPT-6.1 Terra (Medium) is on today's frontier: nothing is both smarter and cheaper.
Claude Opus 5.5 (Low, Default Fallback)GPT-6.1 Terra (Medium)Today's Pareto frontierEvery other model
Matchup
Compare something else
Agents:
Accept: text/markdown or ?format=md returns this page as Markdown. JSON: /api/v1/compare/claude-opus-5-5-low/gpt-6-1-terra-medium · Markdown: /api/v1/compare/claude-opus-5-5-low/gpt-6-1-terra-medium?format=md · llms.txt · agent skill