Is Claude Fable 5.1 dumber today?
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How smart does it feel today?
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| Day | Lobotomized | Dumb | Meh | Solid | Big brain |
|---|
Claude Fable 5.1 discussions
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What Claude Fable 5.1 costs
- Input
- $10.00 /1M tokens
- Output
- $50.00 /1M tokens
- Cached input
- $0.25 /1M tokens
- Context window
- 1M tokens
- Released
- September 1, 2026
Batch API: 50% off input and output.
| 1,000 chat messages1,500 tokens in, 500 out each | $40.00 |
|---|---|
| Summarize a 50-page PDF30,000 tokens in, 1,000 out | $0.35 |
| One coding-agent task60,000 tokens in, 4,000 out, no caching | $0.80 |
Checked September 28, 2026. Official pricing · Status page
Latest from Anthropic
- Claude Opus 5.5 releasedSep 22 · Release
- Claude Fable 5.1 and Mythos 5.1 releasedSep 1 · Release
- Anthropic status: elevated errors on requests to multiple modelsAug 20 · Official incident
- Anthropic status: degraded performance for Claude Opus 5 and Haiku 4.5Aug 19 · Official incident
- Anthropic status: degraded performance for multiple modelsAug 18 · Official incident
All news → · Prices re-checked September 28, 2026.
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Claude Fable 5.1: common questions
How much does Claude Fable 5.1 cost?
Through the Anthropic API, Claude Fable 5.1 costs $10.00 per million input tokens and $50.00 per million output tokens, with cached input at $0.25. That works out to about $40.00 for 1,000 typical chat messages. Prices checked September 28, 2026. The Batch API halves both prices.
Is Claude Fable 5.1 dumber today?
The rating at the top of this page shows how people who used Claude Fable 5.1 today rate it, from Lobotomized to Big brain, and the chart shows the last 30 days next to releases and official incidents. Ratings are opinions, not a benchmark. For outages, check the Anthropic status page.
What is Claude Fable 5.1's context window?
Claude Fable 5.1 accepts up to 1M tokens of input in one request.
When was Claude Fable 5.1 released?
Anthropic released Claude Fable 5.1 on September 1, 2026. See every release and incident on the news page.
What are cheaper alternatives to Claude Fable 5.1?
Among frontier models, Grok 4.7 ($6.00 per 1,000 chats), Gemini 3.1 Pro ($9.00 per 1,000 chats), Claude Opus 5.5 ($16.00 per 1,000 chats) cost less for a typical chat workload. Compare everything in the cost calculator.