Claude Fable 5.1 (High, Default Fallback) vs GPT-5.6 Terra (Xhigh)
Which is better for the money: Claude Fable 5.1 (High, Default Fallback) by Anthropic or GPT-5.6 Terra (Xhigh) 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 Fable 5.1 (High, Default Fallbac… scores 13.2 points higher (51.2 vs 38.0) but costs 4.4× as much to run the benchmark ($5242 vs $1187; flagship vs premium cost classes). They are not alternatives at one budget: pick Claude Fable 5.1 (High, Default Fallbac… when you need intelligence above 38.0, and GPT-5.6 Terra (Xhigh) when 38.0 is enough.
| Metric | Claude Fable 5.1 (High, Default Fallback) | GPT-5.6 Terra (Xhigh) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 51.2 | 38.0 | −25.8% GPT-5.6 Terra (Xhigh) is 25.8% less intelligent |
| Total AA cost (lower is better) | $5,241.59 | $1,186.77 | −77.4% GPT-5.6 Terra (Xhigh) is 77.4% cheaper |
| End-to-end time (lower is better) | 25.53s | 33.63s | +31.7% GPT-5.6 Terra (Xhigh) is 31.7% slower |
| Price per 1M tokens (in / out) | $10.0 / $50.0 | $2.00 / $12.0 | |
| Input modalities | Text, Image | Text, Image |
GPT-5.6 Terra (Xhigh) vs Claude Fable 5.1 (High, Default Fallback): 25.8% less intelligence, 77.4% less cost to run the AA benchmark, and 31.7% slower end-to-end.
Against the frontier
- Claude Fable 5.1 (High, Default Fallback) is off the frontier: at the same or lower cost, Claude Opus 5.5 (Xhigh, Default Fallback) scores 56.00 for $4057.
- GPT-5.6 Terra (Xhigh) is off the frontier: at the same or lower cost, GPT-6.1 Sol (Max) scores 51.80 for $1082.
Compare something else
Accept: text/markdown or ?format=md returns this page as Markdown. JSON: /api/v1/compare/claude-fable-5-1-high/gpt-5-6-terra-xhigh · Markdown: /api/v1/compare/claude-fable-5-1-high/gpt-5-6-terra-xhigh?format=md · llms.txt · agent skill