Claude Fable 5.1

Name: Claude Fable 5.1
Author: Anthropic

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...

by Anthropic(0) 0 installs

Free

Free account. Installing gives you the manifest plus copy-paste snippets.

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About

Reference model card from the OpenRouter listing - model anthropic/claude-fable-5.1. Prices are per million tokens as listed; ratings and installs below are from this marketplace.

Claude Fable 5.1

Facts


Vendor	Anthropic
Context window	1,000,000 tokens
Max output	128,000 tokens
Input price	$10.00 / 1M tokens
Output price	$50.00 / 1M tokens
Input	text, image, file
Output	text
Tool calling	yes
Structured outputs	yes
Reasoning	yes
Open weights	no

Endpoint: https://openrouter.ai/api/v1 (OpenAI-compatible), model anthropic/claude-fable-5.1

Use it

Copy one of these into your project. Installing also returns the manifest and these snippets.

# after Install: the listing is in your workspace's routing pool - nothing else to configure
curl -s -X POST https://api.opensmartroute.ai/api/v1/route -H 'Authorization: Bearer $OSR_API_KEY' -H 'Content-Type: application/json' -d '{"text": "...", "plan": true}'
# or pin it on the OpenAI-compatible endpoint: {"model": "model-anthropic-claude-fable-5-1", ...}

Manifest

An Open Capability Manifest: the router reads it to know what this does, what it costs and when to pick it.

model-anthropic-claude-fable-5-1.ocm.jsonjson

{
  "ocm": "1",
  "id": "model-anthropic-claude-fable-5-1",
  "kind": "llm",
  "name": "Claude Fable 5.1",
  "description": "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...",
  "publisher": "Anthropic",
  "version": "1.0.0",
  "capabilities": {
    "domains": [
      "coding"
    ],
    "tags": [
      "llm",
      "anthropic",
      "openrouter",
      "reasoning",
      "tool-calling",
      "image",
      "file",
      "models"
    ],
    "languages": [
      "en"
    ],
    "modalities": [
      "text",
      "image",
      "file"
    ],
    "supports_tools": true,
    "supports_streaming": true,
    "context_window": 1000000
  },
  "quality_prior": 0.534,
  "examples": [
    "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..."
  ],
  "primary": false,
  "metadata": {
    "source": {
      "provider": "models",
      "ref": "1788285838",
      "url": "https://openrouter.ai/anthropic/claude-fable-5.1",
      "key": "anthropic/claude-fable-5.1",
      "catalogue": "https://openrouter.ai/api/v1"
    },
    "model": "anthropic/claude-fable-5.1",
    "pricing": {
      "input_usd_per_1m": 10,
      "output_usd_per_1m": 50,
      "cache_read_usd_per_1m": 0.25
    },
    "max_output_tokens": 128000,
    "output_modalities": [
      "text"
    ],
    "reasoning": true,
    "created": 1788285838,
    "benchmarks": {
      "intelligence_index": 53.4,
      "coding_index": 81.6,
      "agentic_index": 58,
      "osr_index": 50.8,
      "osr_coverage": 0.4
    }
  },
  "cost": {
    "usd_per_1k_tokens": 0.03
  },
  "endpoints": [
    {
      "protocol": "openai",
      "url": "https://openrouter.ai/api/v1"
    }
  ]
}

Fetch it by URL: GET /api/v1/registry/model-anthropic-claude-fable-5-1/manifest?version=1.0.0

About

Claude Fable 5.1

Facts

Use it

Manifest

Reviews