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Anthropic

Anthropic

Claude Fable 5

Anthropic's Mythos-class flagship tier — above Opus in capability. 1M context, vision, file input, extended reasoning.

Modalities

Text+Image → Text

Input

$13.50 /1M

Output

$67.50 /1M

Context

1M

Speed

medium

Below release

Not established

Weights

Not published

Pricing

Pay per token. Cached input bills at this model’s own cached rate, listed below.

$13.50 /1M input$67.50 /1M output
Hobby10 req/day · 2K in / 500 out
~$18.23/mo
Production1,000 req/day · 2K in / 500 out
~$1,823/mo
Scale20,000 req/day · 2K in / 500 out
~$36,450/mo
+ Estimate your workload
1,000
2,000
500

Estimated monthly cost

$1,823

$60.75 / day on Claude Fable 5

Same workload on:

Claude Sonnet 5$365-80%
Claude Opus 5 Fast$1,823≈

Estimates use list pricing. Actual bills depend on real token counts, and every response includes its exact cost.

How it compares

Against the peers people actually weigh it against.

SpecClaude Fable 5Claude Sonnet 5Claude Opus 5 Fast
Input /1M$13.50$2.70$13.50
Output /1M$67.50$13.50$67.50
Context1M1M1M
ToolsYesYesYes
ReasoningYesYesYes
Speedmediummediumfast

Quick start

Up and running in under two minutes.

  1. 1

    Create an API key

    Sign up and grab a key from the dashboard — $0.50 free credit, no card required.

    Get API key →
  2. 2

    Make your first request

    Drop in your key and send a chat completion — fully OpenAI-compatible.

    curl https://kymaapi.com/v1/chat/completions \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "claude-fable-5",
    "messages": [
      {"role": "user", "content": "Explain prompt caching in one paragraph."}
    ]
  }'
  3. 3

    Stream responses

    Add "stream": true to receive tokens as they arrive.

    curl https://kymaapi.com/v1/chat/completions \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "claude-fable-5",
    "stream": true,
    "messages": [{"role": "user", "content": "Hello!"}]
  }'

FAQ

Common questions about this model.

What is the context window of Claude Fable 5?

Claude Fable 5 has a 1M-token context window — roughly 1471 pages of text in a single request.

How much does the Claude Fable 5 API cost?

$13.50 per 1M input tokens and $67.50 per 1M output tokens. No subscription; you pay only for what you use.

Does Claude Fable 5 support function calling?

Yes — Claude Fable 5 supports tool/function calling and structured outputs (JSON mode), so it works with agent frameworks out of the box.

Are the weights for Claude Fable 5 publicly available?

No. Anthropic does not publish Claude Fable 5's weights — it is reachable through an API rather than as a file you can download and run (https://www.anthropic.com/transparency, read 2026-08-14). That is Anthropic's decision about their own product, not a limitation of Kyma.

Is Claude Fable 5 ever served below the precision its creator released it at?

Kyma cannot say, and for this model nobody can. Anthropic does not publish Claude Fable 5's weights, so there is no released checkpoint whose precision a route could be measured against. We publish "not established" rather than reading a low format as a downgrade: on several models in this catalogue a low format is exactly how the creator ships it.

How do I use Claude Fable 5?

Kyma is OpenAI-compatible: point your SDK's base URL at https://kymaapi.com/v1, use your Kyma API key, and set the model to claude-fable-5. Signing up is free and includes $0.50 of credit — no card required.

Start with $0.50 free credit — no card required.Create account →

More models by Anthropic

ModelContextInputOutput
AnthropicClaude Opus 51M$6.75$33.75
AnthropicClaude Opus 5 Fast1M$13.50$67.50
AnthropicClaude Sonnet 51M$2.70$13.50
AnthropicClaude Opus 4.71M$6.75$33.75
AnthropicClaude Sonnet 4.61M$4.05$20.25
AnthropicClaude Haiku 4.5200K$1.35$6.75