Anthropic: Claude Fable 5.1
Analysis Summary
Claude Fable 5.1 is Anthropic's flagship Fable model in this batch, with leading measured reasoning and coding capability and strong agentic results. It supports a one-million-token context, image and file input, tool use, and function calling. That combination is well suited to complex tasks that require long-context analysis, software work, or multiple tool-driven steps.
For an agency, it can support coding agents, long-document review, and client-facing content tasks where instruction following and quality matter. Vision and file input extend its usefulness beyond text-only workflows. The key trade-off is cost: listed input and output prices make it a premium choice for routine, high-volume requests.
Use Fable 5.1 for work where depth and reliability justify the spend, and route simpler tasks to a lower-cost model.
Assessed September 23, 2026
Editorial notes
Claude Fable 5.1 pairs leading reasoning and coding results with strong agentic performance, a one-million-token context, vision, and tool calling, making it suited to demanding client workflows.
The DFO score ranks models on the Artificial Analysis Intelligence Index and is refreshed as new models launch. The write-up and verdict are our own. Feedback?
DFO Verdict
Claude Fable 5.1 pairs leading reasoning and coding results with strong agentic performance, a one-million-token context, vision, and tool calling, making it suited to demanding client workflows.
Benchmarks
Artificial Analysis data refreshed Nov 3, 2026. Arena ratings from the Oct 28, 2026 text leaderboard, with style control.
How Anthropic: Claude Fable 5.1 compares
Anthropic: Claude Fable 5.1 ranks #7 of 446 AI models we track for overall intelligence, #1 of 199 for coding, #1 of 179 for agentic tasks. Its 1M-token context window is larger than 85% of the models we list. At $10.00 per million input tokens it is cheaper than 3% of comparable models.
Dark bar = input · light bar = output, scaled to the priciest peer.
1M tokens ≈ 8 full-length novels or ~2,500 pages of business documents in a single request.
Pricing
| Token Type | Cost per 1M tokens | Cost per 1K tokens |
|---|---|---|
| Input | $10.00 | $0.010000 |
| Output | $50.00 | $0.050000 |
What would Anthropic: Claude Fable 5.1 cost your business?
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A website chatbot handling around 100 customer conversations a day, a few short messages each.
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These numbers get smaller with the right architecture.
We route routine calls to cheap models and save Anthropic: Claude Fable 5.1 for the hard ones. Most clients cut their estimate by 60-80%.
Talk to our teamAbout 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..
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Frequently asked questions about Anthropic: Claude Fable 5.1
How much does Anthropic: Claude Fable 5.1 cost?
Anthropic: Claude Fable 5.1 costs $10.00 per million input tokens and $50.00 per million output tokens.
What is the context window of Anthropic: Claude Fable 5.1?
Anthropic: Claude Fable 5.1 has a context window of 1,000,000 tokens (1M).
Is Anthropic: Claude Fable 5.1 good for coding?
On our coding benchmark index, Anthropic: Claude Fable 5.1 ranks #1 of 199 models, placing it in the top quartile of the field for code generation and debugging.
What can Anthropic: Claude Fable 5.1 do?
Anthropic: Claude Fable 5.1 supports image/vision input, tool use, and function calling.
Who created Anthropic: Claude Fable 5.1?
Anthropic: Claude Fable 5.1 is developed by Anthropic and was released on September 1, 2026.