Claude Fable 5 (Max, Opus 4.8 Fallback) vs Claude Opus 5.5 (Low, Default Fallback)
Which is better for the money: Claude Fable 5 (Max, Opus 4.8 Fallback) by Anthropic or Claude Opus 5.5 (Low, Default Fallback) by Anthropic? Intelligence, total benchmark cost, and end-to-end time from Artificial Analysis & other sources, snapshot 2026-10-26.
Depends on your budget
Claude Fable 5 (Max, Opus 4.8 Fallback) scores 7.3 points higher (49.6 vs 42.3) but costs 13× as much to run the benchmark ($11161 vs $860; flagship vs premium cost classes). They are not alternatives at one budget: pick Claude Fable 5 (Max, Opus 4.8 Fallback) when you need intelligence above 42.3, and Claude Opus 5.5 (Low, Default Fallback) when 42.3 is enough.
| Metric | Claude Fable 5 (Max, Opus 4.8 Fallback) | Claude Opus 5.5 (Low, Default Fallback) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 49.6 | 42.3 | −14.7% Claude Opus 5.5 (Low,… is 14.7% less intelligent |
| Total AA cost (lower is better) | $11,160.86 | $860.33 | −92.3% Claude Opus 5.5 (Low,… is 92.3% cheaper |
| End-to-end time (lower is better) | 85.47s | 11.52s | −86.5% Claude Opus 5.5 (Low,… is 86.5% faster |
| Price per 1M tokens (in / out) | $10.0 / $50.0 | $4.00 / $20.0 | |
| Input modalities | Text, Image | Text, Image |
Claude Opus 5.5 (Low, Default Fallback) vs Claude Fable 5 (Max, Opus 4.8 Fallback): 14.7% less intelligence, 92.3% less cost to run the AA benchmark, and 86.5% faster end-to-end.
Against the frontier
- Claude Fable 5 (Max, Opus 4.8 Fallback) is off the frontier: at the same or lower cost, Claude Opus 5.5 (Max, Default Fallback) scores 57.60 for $8708.
- 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.
Compare something else
Accept: text/markdown or ?format=md returns this page as Markdown. JSON: /api/v1/compare/claude-fable-5/claude-opus-5-5-low · Markdown: /api/v1/compare/claude-fable-5/claude-opus-5-5-low?format=md · llms.txt · agent skill