Claude Fable 5.1on Krater.ai

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

Use Claude Fable 5.1

Released September 1, 2026

Specifications

Claude Fable 5.1 at a glance

Context

1M tokens

Max output

128K tokens

Input

Text, Image, File

Output

Text

Input price

$10.00 / 1M

Output price

$50.00 / 1M

Krater rank

#20

Image inputTool callingStructured outputsReasoning supportProvider moderated

Is Claude down?

Claude slow or throwing errors? The live Claude status page shows Anthropic incidents and which Krater models to use meanwhile.

Live Claude status

Capabilities

What it is good at

Catalog capabilities

  • Accepts image input
  • Generates text responses
  • Supports tool calling
  • Supports structured outputs

Good for

Image understandingLong documentsUse with toolsStructured responsesDeep analysis

Benchmarks

Catalog data, not Krater benchmarks.

Coding index score

80.7

Agentic index score

57.2

Intelligence index score

49.7

Design Arena fullstack rank

#1

Design Arena godotgamedev rank

#1

Claude Fable 5.1

Chat with Claude Fable 5.1 in Krater.

Ask anything...

Compare

Compare Claude Fable 5.1

Claude Fable 5.1 vs Claude Haiku 5.5

Claude Haiku 5.5 is Anthropic's small, fast model for high-volume, cost-sensitive work such as summarization, subagents, and browser use.

Open comparison

Claude Fable 5.1 vs Claude Opus 5

Claude Opus 5 is Anthropic’s flagship model for demanding reasoning, coding, and long-horizon agentic work.

Open comparison

Claude Fable 5.1 vs Claude Fable 5

Claude Fable 5 is a Mythos-class model from Anthropic, built for autonomous knowledge work and coding.

Open comparison

Browse all model comparisons

FAQ

Questions about Claude Fable 5.1

Clear answers based on the model catalog and Krater access.

Claude Fable 5.1 supports a context window of 1,000,000 tokens.

Use Claude Fable 5.1 in your API

Connect with Krater's unified API.

API access

Ready to use Claude Fable 5.1?

Access leading models in one focused workspace.

Start with Claude Fable 5.1