Claude Fable 5.1 spotted on DesignArena
Claude Fable 5.1 is a model from Anthropic, released on 1 Sep 2026. First seen 8 Sep 2026. Catalogues list a 1,000,000 tokens context window. 12 evidence links.
Facts as of
- Context window
- 1,000,000
- Input · USD / 1M tokens
- $10.00
- Output · USD / 1M tokens
- $50.00
- Max output
- 128,000
- Input
- text · image
- Output
- text
- Cached input · USD / 1M tokens
- $0.25
Alex's take
Alex has not commented on this signal yet. When Alex posts about a signal, the post appears here and on the home page beside it.
Evidence links 12
- DesignArena · uicomponentevidence linkdesignarena.ai
- DesignArena · websiteevidence linkdesignarena.ai
- DesignArena · uicomponentevidence linkdesignarena.ai
- DesignArena · websiteevidence linkdesignarena.ai
- models.dev · catalogueevidence linkmodels.dev
- OpenRouterevidence linkopenrouter.ai
- OpenCode · discoveryevidence linkopencode.ai
- Artificial Analysis · benchmarksevidence linkartificialanalysis.ai
- Vercel AI Gatewayevidence linkvercel.com
- models.dev · catalogueevidence linkmodels.dev
- Anthropic · model indexevidence linkplatform.claude.com
- Arena · leaderboardsevidence linkanthropic.com
Related signals
AnthropicSightingClaude Haiku 5.5 (Max, Default Fallback) enters at 43.4 on the Intelligence Index
Confirmed19 evidence links