Claude 4.5 Haiku (Reasoning) vs Claude Fable 5.1 (Xhigh, Default Fallback)
Which is better for the money: Claude 4.5 Haiku (Reasoning) by Anthropic or Claude Fable 5.1 (Xhigh, 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 5.1 (Xhigh, Default Fallba… scores 36.3 points higher (53.2 vs 16.9) but costs 17× as much to run the benchmark ($9063 vs $547; flagship vs premium cost classes). They are not alternatives at one budget: pick Claude Fable 5.1 (Xhigh, Default Fallba… when you need intelligence above 16.9, and Claude 4.5 Haiku (Reasoning) when 16.9 is enough.
| Metric | Claude 4.5 Haiku (Reasoning) | Claude Fable 5.1 (Xhigh, Default Fallback) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 16.9 | 53.2 | +214.8% Claude Fable 5.1 (Xhi… is 3.1× more intelligent |
| Total AA cost (lower is better) | $546.96 | $9,063.11 | +1557.0% Claude Fable 5.1 (Xhi… is 17× more expensive |
| End-to-end time (lower is better) | 23.69s | 111.44s | +370.4% Claude Fable 5.1 (Xhi… is 370.4% slower |
| Price per 1M tokens (in / out) | $1.00 / $5.00 | $10.0 / $50.0 | |
| Input modalities | Text, Image | Text, Image |
Claude Fable 5.1 (Xhigh, Default Fallback) vs Claude 4.5 Haiku (Reasoning): 214.8% more intelligence, 1557.0% more cost to run the AA benchmark, and 370.4% slower end-to-end.
Against the frontier
- Claude 4.5 Haiku (Reasoning) is off the frontier: at the same or lower cost, GPT-6.1 Sol (High) scores 50.20 for $521.
- Claude Fable 5.1 (Xhigh, Default Fallback) is off the frontier: at the same or lower cost, Claude Opus 5.5 (Max, Default Fallback) scores 57.60 for $8708.
Compare something else
Accept: text/markdown or ?format=md returns this page as Markdown. JSON: /api/v1/compare/claude-4-5-haiku-reasoning/claude-fable-5-1-xhigh · Markdown: /api/v1/compare/claude-4-5-haiku-reasoning/claude-fable-5-1-xhigh?format=md · llms.txt · agent skill