Anthropic
Claude Fable 5.1
Claude Fable 5.1 improves on Claude Fable 5 across the board, with the biggest gains in agentic coding, long-running agentic workflows, and knowledge work: long code refactors, front-end and visual
At a glance
- Input / 1M
- $10
- Output / 1M
- $50
- Context
- 1M
- Max output
- 128K
- Intelligence
- 53.4
- Released
- Sep 2026
Pricing
Claude Fable 5.1 API pricing
Per-token rates, plus what common tasks actually cost.
| Input tokensPer 1M tokens | $10 |
|---|---|
| Output tokensPer 1M tokens | $50 |
| Cached input (read)Per 1M tokens | $0.25 |
| Cache writePer 1M tokens | $12.50 |
| Web searchPer request | $0.01 |
Chat message
2K in, 500 out
$45
per 1,000 requests
Coding task
30K in, 4K out
$500
per 1,000 requests
Long document summary
150K in, 2K out
$1600
per 1,000 requests
Benchmarks
Claude Fable 5.1 benchmark scores
Independent scores from Artificial Analysis. Higher is better.
Intelligence index
53.4
Coding index
81.6
Agentic index
57.9
Specs
Context window and capabilities
What it can read, what it can write, and which API features it supports.
- Context window
- 1M tokens
- Max output
- 128K tokens
- Input types
- File, Image, Text
- Output types
- Text
- Reasoning effort
- Max, Extra high, High, Medium, Low
- Release date
- September 1, 2026
- Tool calling
- Structured outputs
- JSON mode
- Reasoning
- Temperature
- Stop sequences
- Deterministic seed
- Verbosity control
Compare
Claude Fable 5.1 vs other models
See how Claude Fable 5.1 stacks up head to head on price, benchmarks, and features.
VSClaude Fable 5.1 vs Claude Opus 5.5
Anthropic vs Anthropic
See comparisonVSClaude Fable 5.1 vs Claude Sonnet 5.5
Anthropic vs Anthropic
See comparisonVS
Claude Fable 5.1 vs GPT-6 Astra
Anthropic vs OpenAI
See comparisonVSClaude Fable 5.1 vs GPT-6.1 Sol
Anthropic vs OpenAI
See comparisonVSClaude Fable 5.1 vs Claude Opus 5
Anthropic vs Anthropic
See comparisonVSClaude Fable 5.1 vs Claude Fable 5
Anthropic vs Anthropic
See comparisonMore Claude Fable 5.1 comparisons
- Claude Fable 5.1 vs Muse Spark 1.3
- Claude Fable 5.1 vs GPT-6 Sol
- Claude Fable 5.1 vs GPT-5.6 Sol
- Claude Fable 5.1 vs Kimi K3
- Claude Fable 5.1 vs GLM 5.3 Flash
- Claude Fable 5.1 vs Claude Opus 4.8
- Claude Fable 5.1 vs DeepSeek V4.1 Flash
- Claude Fable 5.1 vs GPT-6 Luna
- Claude Fable 5.1 vs MiMo-V2.6-Flash
- Claude Fable 5.1 vs DeepSeek V4 Flash 0731
- Claude Fable 5.1 vs Hy4 preview
Alternatives
Claude Fable 5.1 alternatives
Similar models worth considering, and where each one has the edge.
Anthropic
Claude Opus 5.5
Anthropic
Claude Sonnet 5.5
OpenAI
GPT-6 Astra
Want to learn about other models? Browse all models
FAQ
Frequently asked questions
How much does Claude Fable 5.1 cost?
Claude Fable 5.1 costs $10 per 1M input tokens and $50 per 1M output tokens through the API. A typical chat message costs about $45 per 1,000 messages.
What is the context window of Claude Fable 5.1?
Claude Fable 5.1 accepts up to 1M tokens of input and can write up to 128K tokens in a single response.
What is the best alternative to Claude Fable 5.1?
Claude Opus 5.5 from Anthropic is a strong alternative. It offers: 2.5x cheaper output, higher intelligence score, newer release.
Can I use Claude Fable 5.1 alongside other models?
Yes. Shortcut Chat sends one prompt to Claude Fable 5.1 and any other models you pick at the same time, so you can compare answers side by side.
Try Claude Fable 5.1 next to every other model.
Use Claude Fable 5.1 alongside all the other models. Use one at a time, or multiple together. Get the best answer from every AI.