# Claude Fable 5

> Anthropic's model for autonomous knowledge work and coding, with reasoning, tool calling and image input.

## Key facts

- Model author: Anthropic
- Input: $9.6807 per 1M tokens (starting price)
- Output: $48.4034 per 1M tokens (starting price)
- Cached input: $0.9681 per 1M tokens
- Context window: 1,000,000 tokens
- Maximum output: 128,000 tokens
- Input modalities: image, text
- Output modalities: text
- Capabilities: reasoning, tools, vision
- Released: 2026-06-09
- Knowledge cutoff: Jan 2026
- Model IDs: `anthropic/claude-fable-5`, `jd/claude-fable-5`
- Model page: https://www.realrelay.ai/model/anthropic/claude-fable-5

## Overview

Claude Fable 5 is a model from Anthropic built for autonomous knowledge work and coding. It is aimed at tasks that run with little supervision, such as researching a topic, drafting a document or making changes across a codebase. It supports reasoning and tool calling, accepts text and image input, and returns text.

Claude Fable 5 has a 1M-token context window and can generate up to 128K output tokens. It accepts text and image input and returns text output. It was released on June 9, 2026. Its knowledge cutoff is January 2026.

## Capabilities

Claude Fable 5 supports reasoning, tool calling and image understanding. It accepts text and image as input and produces text as output.

Reasoning lets Claude Fable 5 work through multi-step problems before it answers, and tool calling lets it act on external systems as part of an autonomous task. Image input extends this to screenshots, diagrams and scanned documents.

## Pricing

Claude Fable 5 starts from $9.68 per 1M input tokens and from $48.40 per 1M output tokens. Cache reads start from $0.97 per 1M tokens.

Pricing is tiered, and the price shown is the starting tier. Claude Fable 5 is available through RealRelay's OpenAI-compatible API.

## Use cases

Use Claude Fable 5 for autonomous coding work: it can read a repository, call tools to run commands and tests, and carry a change through several steps within its 1M-token context window.

For knowledge work, it can read long documents and screenshots, reason over them and produce reports, summaries or drafts that a person then reviews.

## Call it

OpenAI-compatible chat completions:

```bash
curl https://www.realrelay.ai/v1/chat/completions \
  -H "Authorization: Bearer $REALRELAY_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model": "anthropic/claude-fable-5", "messages": [{"role": "user", "content": "Hello"}]}'
```

## FAQ

### What is Claude Fable 5?

Claude Fable 5 is a model from Anthropic built for autonomous knowledge work and coding. It supports reasoning, tool calling and image understanding and accepts text and image input.

### How much does Claude Fable 5 cost?

Claude Fable 5 starts from $9.68 per 1M input tokens and from $48.40 per 1M output tokens, with cache reads from $0.97 per 1M tokens. Pricing is tiered, and these are the starting-tier prices.

### What is the context window of Claude Fable 5?

Claude Fable 5 has a 1M-token context window and can generate up to 128K tokens in a single response.

### What inputs and outputs does Claude Fable 5 support?

Claude Fable 5 accepts text and image input and returns text output.

### Does Claude Fable 5 support tool calling?

Yes. Claude Fable 5 supports tool calling, so it can call functions you define and use the results in multi-step tasks. It also supports reasoning and image understanding.

### When was Claude Fable 5 released?

Claude Fable 5 was released on June 9, 2026. Its knowledge cutoff is January 2026.

### How do I call Claude Fable 5 via the API?

Call Claude Fable 5 through RealRelay's OpenAI-compatible API using the model ID anthropic/claude-fable-5.