Anthropic

Claude Fable 5

anthropic/claude-fable-5

chatvisiondocumentreasoningagenticcodinglong-contexttoolspowerful

Input price

6391.8 RODI/M

~ 10 USD/M

Output price

31958.6 RODI/M

~ 50 USD/M

Context

1M

Max output

128K

Input:textimagedocument
Output:text

Providers & pricing

ProviderInputOutputFree tier
Anthropic

Anthropic

Default

6391.8 RODI/M~10.00 USD/M31958.6 RODI/M

Pricing

RateRODIUSD (ref.)Unit
In6391.8~ 10.00USD/M · RODI/M
Out31958.6~ 50.00USD/M · RODI/M
Cached639.2~ 1.00USD/M · RODI/M

RODI prices include RodiumAi markup and upstream fees. USD figures are wholesale reference rates.

Capabilities

Streaming
Tool calling
Vision
JSON mode
Reasoning

About this model

Claude Fable 5 is a Mythos-class model from Anthropic, built for autonomous knowledge work and coding. It supports text, image, and file inputs with text output, with reasoning support and a 1M-token context window. It is suited for long-running, complex, and asynchronous tasks that previously required frequent human check-ins. It is particularly strong at end-to-end work that would otherwise take a person hours, days, or weeks — taking on problems that are long-running, ambiguous, or highly multi-step. It executes well-scoped tasks with few mistakes, automatically self-correcting through verification loops, and ships with robust safeguards.

API usage

Use the canonical model slug in your chat completion requests.

OpenAI-compatible

POST /v1/chat/completions — openai package + RodiumAi base_url

Anthropic SDK

POST /v1/messages — anthropic package + base_url https://api.rodiumai.io

Chat completions docs →