free-ai-api-keys

anthropic/claude-fable-5

Anthropic: Claude Fable 5

Context length
1000K
Input / 1M tokens
$10.00
Output / 1M tokens
$50.00
Released
2026-06-09
Modality
text+image+file->text

About Anthropic: Claude Fable 5

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...

Call Anthropic: Claude Fable 5

Via OpenRouter: one base URL for every provider.

curl https://openrouter.ai/api/v1/chat/completions \
  -H "Authorization: Bearer $OPENROUTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "anthropic/claude-fable-5",
    "messages": [{"role": "user", "content": "Say hello"}]
  }'

Direct on Anthropic:

curl https://api.anthropic.com/chat/completions \
  -H "Authorization: Bearer $ANTHROPIC_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "claude-fable-5",
    "messages": [{"role": "user", "content": "Say hello"}]
  }'

Anthropic keys

OpenRouter keys

OpenRouter keys work for anthropic/claude-fable-5 regardless of the upstream provider.