Claude Fable 5.1 (High, Default Fallback)
By Anthropic · released 2026-09-01 (7 weeks) · snapshot 2026-10-24
- Intelligence index
- 51.20
- Cost to run the AA index
- $5242
- Price per 1M tokens (in / out)
- $10.0 / $50.0
- End-to-end time
- 34.3s
Is Claude Fable 5.1 (High, Default Fallback) on the Pareto frontier, and what beats it?
Off the frontier
No. Claude Opus 5.5 (Xhigh, Default Fallback) is at least as smart for the same money or less.
Next step up: Claude Opus 5.5 (Max, Default Fallback), smarter but dearer.
| # | Model | Creator | Intelligence | Total cost | E2E total | Open | Released | Frontier |
|---|---|---|---|---|---|---|---|---|
| 1 | Claude Fable 5.1 (High, Default Fallback) | Anthropic | 51.20 | $5242 | 34.3s | 2026-09-01 | ||
| 2 | Claude Opus 5.5 (Xhigh, Default Fallback) | Anthropic | 56.00 | $4057 | 123.1s | 2026-09-22 | Frontier | |
| 3 | Claude Opus 5.5 (Max, Default Fallback) | Anthropic | 57.60 | $8708 | 626.1s | 2026-09-22 | Frontier |
Open in the picker Daily check URL: 200 on the frontier, 409 once beaten
Claude Fable 5.1 (High, Default Fallback) today
Intelligence: Artificial Analysis Intelligence Index. Cost: total cost to run that benchmark, so reasoning tokens count. API id: claude-fable-5-1-high.
Compare head to head
Suggested: what beats it, its effort levels, and frontier models near its price.
- Claude Fable 5.1 (High, Default Fallback) vs Claude Opus 5.5 (Xhigh, Default Fallback)
- Claude Fable 5.1 (High, Default Fallback) vs Claude Opus 5.5 (Max, Default Fallback)
- Claude Fable 5.1 (High, Default Fallback) vs Claude Fable 5.1 (Low, Default Fallback)
- Claude Fable 5.1 (High, Default Fallback) vs Claude Fable 5.1 (Medium, Default Fallback)
- Claude Fable 5.1 (High, Default Fallback) vs Claude Fable 5.1 (Xhigh, Default Fallback)
- Claude Fable 5.1 (High, Default Fallback) vs Claude Fable 5.1 (Max, Default Fallback)
- Claude Fable 5.1 (High, Default Fallback) vs Claude Opus 5.5 (High, Default Fallback)
- Claude Fable 5.1 (High, Default Fallback) vs Kimi K3.1 Pro
Compare Claude Fable 5.1 (High, Default Fallback) with measured models
What the Claude Fable 5.1 release did to the frontier on 2026-09-01
5 of 5 effort levels reached the frontier at launch (Claude Fable 5.1 (Low, Default Fallback), Claude Fable 5.1 (Medium, Default Fallback), Claude Fable 5.1 (High, Default Fallback), Claude Fable 5.1 (Xhigh, Default Fallback), Claude Fable 5.1 (Max, Default Fallback)). Impact 1.41, #22 of 46 releases this past year.
Should you use Claude Fable 5.1 (High, Default Fallback)?
Should you use Claude Fable 5.1 (High, Default Fallback)?
Only when it fits your setup: Claude Opus 5.5 (Xhigh, Default Fallback) is at least as smart for the same money or less, so Claude Fable 5.1 (High, Default Fallback) is off the value frontier today.
What is better and cheaper than Claude Fable 5.1 (High, Default Fallback)?
Claude Opus 5.5 (Xhigh, Default Fallback) — at least as smart for the same money or less.
How much does Claude Fable 5.1 (High, Default Fallback) cost?
$10/$50 in/out per 1M tokens, and $5242 to run the full Artificial Analysis Intelligence Index, the honest all-in number for reasoning models.
Is Claude Fable 5.1 (High, Default Fallback) on the Pareto frontier?
No: Claude Opus 5.5 (Xhigh, Default Fallback) beats it on intelligence, cost, or both.
Frontier membership by axis pair
Other axis pairs where Claude Fable 5.1 (High, Default Fallback) is Pareto-optimal.
| Y axis | X axis | On the frontier |
|---|---|---|
| AA intelligence index | AA total cost to run (USD) | |
| AA intelligence index | End-to-end total seconds | |
| AA intelligence index | Output speed tokens/sec |
Accept: text/markdown or ?format=md returns this page as Markdown. JSON: /api/v1/models/claude-fable-5-1-high · Markdown: /api/v1/models/claude-fable-5-1-high?format=md · llms.txt · agent skill