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Claude

Claude Fable 5

Official

anthropic/claude-fable-5

Anthropic's most capable generally available model. A Mythos-class model built for autonomous coding, knowledge work, and long-horizon agents, with a 1M-token context window and native prompt caching. State-of-the-art on software engineering and long-context tasks. Pick it when you need the absolute top of the line.

1000K contextVisionReasoningTool callingCodingPrompt cache

Pricing

Source: anthropic_x0.18 · Verified 2026-07-23

InputOfficial $10 / M tokens
$1.8/ M tokensSave 82%
OutputOfficial $50 / M tokens
$9/ M tokensSave 82%

Cache read $0.18/M · Cache write $2.25/M

Estimate cost

Estimated cost$0.027

Protocols

  • OpenAI Chat CompletionsStatus: Not supported—
  • OpenAI ResponsesStatus: Not supported—
  • Anthropic MessagesStatus: Available: Streaminghttps://api.routemux.com/anthropic
  • Google Vertex AIStatus: Not supported—
  • OpenAI ImagesStatus: Not supported—
  • OpenAI SoraStatus: Not supported—

Call IDs

Use either ID to call this model via the API.

RouteMux nameanthropic/claude-fable-5

Try it

Replace the ROUTEMUX_KEY placeholder with your API key. Create one →

from anthropic import Anthropic

client = Anthropic(
    base_url="https://api.routemux.com/anthropic",
    api_key="<ROUTEMUX_KEY>",
)

message = client.messages.create(
    model="anthropic/claude-fable-5",
    max_tokens=1024,
    messages=[{"role": "user", "content": "What is the meaning of life?"}],
)
print(message.content[0].text)
base_url: https://api.routemux.com/anthropic

Frequently asked questions

›What is Claude Fable 5?

Anthropic's most powerful model — Mythos-class, above Opus.

›How large is the context window of Claude Fable 5?

Claude Fable 5 supports a context window of up to 1M tokens, with up to 8K output tokens per request.

›How much does the Claude Fable 5 API cost?

Through RouteMux, Claude Fable 5 costs $1.8 for input and $9 for output (USD per 1M tokens), below the official list price.

›How do I call Claude Fable 5 via API?

Claude Fable 5 is OpenAI-compatible: point your base URL at RouteMux and set the model field to anthropic/claude-fable-5 — no code changes needed.

›Which input and output modalities does Claude Fable 5 support?

Claude Fable 5 accepts text, image as input and produces text as output.