anthropic

Claude Fable API Pricing (September 2026)

anthropic/claude-fable-5.1

Compare Claude Fable API pricing, explore each model’s capabilities, and start building with one NanoGPT API key.

ReasoningVisionNative PDF inputTool CallingStructured Output

Input / 1M tokens: $10.00
Output / 1M tokens: $50.00
Cache read / 1M tokens: $0.25
Cache creation / 1M tokens: $12.50
1-hour cache creation / 1M tokens: $20.00
Average output tokens: 1,721
Context: 1,000,000

Get API Key API documentation

Build with Claude Fable 5.1

curl https://nano-gpt.com/api/v1/chat/completions \
  -H "Authorization: Bearer $NANOGPT_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "anthropic/claude-fable-5.1",
  "messages": [
    {
      "role": "user",
      "content": "Hello!"
    }
  ]
}'

Set NANOGPT_API_KEY in your environment. Keep your API key on the server.

Fable model pricing per 1M tokens

Find a modelProviderSort by

Input tokens per estimated query

USD per 1 million tokens · NanoGPT standard catalogue rates
Model / API ID	Input	Cache read	Cache creation	Output	Context	Average output tokens	Estimated query cost
Claude Fable 5`anthropic/claude-fable-5`	$10.00	$1.00	$12.501-hour: $20.00	$50.00	1,000,000	1,130	$0.0665
Claude Fable 5.1`anthropic/claude-fable-5.1`	$10.00	$0.25	$12.501-hour: $20.00	$50.00	1,000,000	1,721	$0.09605
Claude Fable Latest`anthropic/claude-fable-latest`	$10.00	$0.25	$12.501-hour: $20.00	$50.00	1,000,000	Unavailable	Unavailable

Base text-token rates. Long-context pricing, tool charges, service tiers, and provider selection can change the total. Cache creation is charged when writing tokens to the cache; cache read applies when reusing them. The default cache duration applies unless labeled otherwise. Unsupported cache rates are marked unavailable.

Estimated query cost combines your input-token count with the model’s average output, rounded to whole tokens, at current standard rates. It assumes uncached input and excludes tool charges. This is an estimate for that workload, not a measured average total bill.

anthropic

Claude Fable 5.1

anthropic/claude-fable-5.1

Claude Fable 5.1 improves on Fable 5 across agentic coding, long-running workflows, front-end and visual code generation, finance, analysis, and knowledge work, with more concise plans and summaries. Anthropic retains prompts and outputs for 30 days; Zero Data Retention is not available.

ReasoningVisionNative PDF inputTool CallingStructured Output

Input / 1M tokens: $10.00
Output / 1M tokens: $50.00
Cache read / 1M tokens: $0.25
Cache creation / 1M tokens: $12.50
1-hour cache creation / 1M tokens: $20.00
Average output tokens: 1,721
Context: 1,000,000

Use this model API documentation

Build with Claude Fable 5.1

curl https://nano-gpt.com/api/v1/chat/completions \
  -H "Authorization: Bearer $NANOGPT_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "anthropic/claude-fable-5.1",
  "messages": [
    {
      "role": "user",
      "content": "Hello!"
    }
  ]
}'

Set NANOGPT_API_KEY in your environment. Keep your API key on the server.

anthropic

Claude Fable 5

anthropic/claude-fable-5

Anthropic Claude Fable 5 for long-running coding, research, and knowledge-work tasks. Anthropic retains prompts and outputs for 30 days under its Covered Models policy; Zero Data Retention is not available.

ReasoningVisionNative PDF inputTool CallingStructured Output

Input / 1M tokens: $10.00
Output / 1M tokens: $50.00
Cache read / 1M tokens: $1.00
Cache creation / 1M tokens: $12.50
1-hour cache creation / 1M tokens: $20.00
Average output tokens: 1,130
Context: 1,000,000

Use this model API documentation

Build with Claude Fable 5

curl https://nano-gpt.com/api/v1/chat/completions \
  -H "Authorization: Bearer $NANOGPT_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "anthropic/claude-fable-5",
  "messages": [
    {
      "role": "user",
      "content": "Hello!"
    }
  ]
}'

Set NANOGPT_API_KEY in your environment. Keep your API key on the server.

anthropic

Claude Fable Latest

anthropic/claude-fable-latest

Compatibility alias for Claude Fable 5.1. Anthropic retains prompts and outputs for 30 days under its Covered Models policy; Zero Data Retention is not available.

ReasoningVisionNative PDF inputTool CallingStructured Output

Input / 1M tokens: $10.00
Output / 1M tokens: $50.00
Cache read / 1M tokens: $0.25
Cache creation / 1M tokens: $12.50
1-hour cache creation / 1M tokens: $20.00
Context: 1,000,000

Use this model API documentation

Build with Claude Fable Latest

curl https://nano-gpt.com/api/v1/chat/completions \
  -H "Authorization: Bearer $NANOGPT_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "anthropic/claude-fable-latest",
  "messages": [
    {
      "role": "user",
      "content": "Hello!"
    }
  ]
}'

Set NANOGPT_API_KEY in your environment. Keep your API key on the server.

Estimate a request’s token cost

ModelInput tokensOutput tokens

$0.15

One request, standard uncached text tokens. Excludes tools and other charges. Known long-context rates apply automatically; invalid workloads or missing rates cannot be estimated.