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.
Rankings consider pricing, capabilities, benchmarks, and real-world applicability and are refreshed as new models launch. 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.
How Anthropic: Claude Fable 5.1 compares
Anthropic: Claude Fable 5.1 ranks #9 of 444 AI models we track for overall intelligence, #1 of 210 for coding, #6 of 192 for agentic tasks. Its 1M-token context window is larger than 82% of the models we list. At $10.00 per million input tokens it is cheaper than 4% 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.
Strongest on technical. The pulled-in value corner is the trade-off, and if the shape matters more than the price, this is your model.
Compare shapes side-by-side →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?
Pick the job that looks most like yours, then fine-tune with the sliders. Estimates update live.
A website chatbot handling around 100 customer conversations a day, a few short messages each.
Full calculator with 804 models → Price Calculator
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 210 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.