# Claude Fable 5.1 release · 2026-09-01 · snapshot 2026-10-26

Creator: Anthropic · 5 effort levels

| Effort level | Input modalities | Intelligence | Total cost | E2E | On the frontier today | ID |
|---|---|---|---|---|---|---|
| Claude Fable 5.1 (Low, Default Fallback) | Text, Image | 46.80 | $3158 | 11.3s | no | `claude-fable-5-1-low` |
| Claude Fable 5.1 (Medium, Default Fallback) | Text, Image | 48.90 | $3983 | 22.5s | no | `claude-fable-5-1-medium` |
| Claude Fable 5.1 (High, Default Fallback) | Text, Image | 51.20 | $5242 | 28.4s | no | `claude-fable-5-1-high` |
| Claude Fable 5.1 (Xhigh, Default Fallback) | Text, Image | 53.20 | $9063 | 111.4s | no | `claude-fable-5-1-xhigh` |
| Claude Fable 5.1 (Max, Default Fallback) | Text, Image | 53.40 | $13129 | 251.2s | no | `claude-fable-5-1` |

## Launch day (2026-09-01)

- Reached the frontier: 5 of 5
- Impact (intelligence × log-cost hypervolume gained): 1.41
- Rank: #23 of 45 releases this past year


> Metrics snapshot: 2026-10-26T21:34:20Z. Intelligence index version: unknown. Release timeline, frontier age, release impact and shakeup cards are reconstructions using one selected snapshot's metrics, not a record of what was known at release. Scores, benchmark cost and derived value may change when the index methodology changes. Source documentation advertises v4.3.2; API correspondence is unverified.