Plain-text specification

Claude Fable 5 API

Claude Fable 5 is a large language model by Anthropic, available on the Venice API as claude-fable-5. Requests are anonymized, so the provider never sees your identity.Claude Fable 5 is Anthropic’s most capable widely released model, designed for demanding reasoning and long-horizon agentic work. It features a 1M token context window, 128K max output tokens, always-on adaptive thinking, and strong multimodal capabilities.

Claude Fable 5 API pricing

Model ID	Variant	Privacy	Price
`claude-fable-5`	Standard	Anonymized	$12.00 input /$ 60.00 output per 1M tokens

Claude Fable 5 specifications

Spec	Value
Provider	Anthropic
Released	Jun 10, 2026
Privacy	Anonymized
Context window	1M tokens
Max output	125K tokens
Reasoning effort	low, medium, high, xhigh, max

How to use the Claude Fable 5 API

Send requests to POST https://api.venice.ai/api/v1/chat/completions with "model": "claude-fable-5" and your API key.

curl https://api.venice.ai/api/v1/chat/completions \
  -H "Authorization: Bearer $VENICE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "claude-fable-5",
    "messages": [{ "role": "user", "content": "Explain TEE attestation in two sentences." }],
    "reasoning_effort": "high"
  }'

Claude Fable 5 API FAQ

How much does the Claude Fable 5 API cost?

12.00 per 1M input tokens and

60.00 per 1M output tokens, with cached input at $1.20 per 1M. Prices are in USD and can be paid in DIEM at parity.

What is the Claude Fable 5 model ID?

Use claude-fable-5 as the model parameter.

Is the Claude Fable 5 API private?

Claude Fable 5 is anonymized: Venice forwards requests to the provider without your identity, but the provider may retain prompt data, so use a private model for sensitive work.

What is the context window of Claude Fable 5?

1M tokens of context, with up to 125K output tokens per response.

What does Claude Fable 5 support?

Claude Fable 5 supports function calling, structured outputs, reasoning, image input, web search and prompt caching. Reasoning effort is adjustable with reasoning_effort: low, medium, high, xhigh and max (default high).

Which endpoint does the Claude Fable 5 API use?

Call POST /chat/completions. /responses (Alpha) is also supported.

Related models

Claude Fable 5.1 API: $12.00 input /$ 60.00 output per 1M tokens
GPT-6 Astra Pro API: $12.50 input /$ 62.50 output per 1M tokens
GPT-6 Astra API: $10.00 input /$ 50.00 output per 1M tokens
GPT-5.5 API: $6.25 input /$ 37.50 output per 1M tokens