anthropic/claude-fable-5

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...

6/9/2026

1,000,000 tokens

#1 Text (Overall)

Input: ¥1,787.149/M

Output: ¥8,935.745/M

Try in Chat Get API Key

Specifications

Modalities

Input

text

image

file

Output

text

Supported Parameters

include_reasoning

max_completion_tokens

max_tokens

reasoning

reasoning_effort

response_format

stop

structured_outputs

tool_choice

tools

verbosity

Max Output Tokens

128,000

Code Examples

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

Leaderboard

Text

🏆OverallELO: 1,507

🇯🇵JapaneseELO: 1,547

🇨🇳ChineseELO: 1,555

🇰🇷KoreanELO: 1,502

🇬🇧EnglishELO: 1,512

frenchELO: 1,543

germanELO: 1,493

spanishELO: 1,511

russianELO: 1,521

💻CodingELO: 1,553

🧮MathELO: 1,543

✍️Creative WritingELO: 1,508

📝Instruction FollowingELO: 1,513

🌶️Hard PromptsELO: 1,534

💬Multi-TurnELO: 1,518

Vision

🏆OverallELO: 1,318

Code

🏆OverallELO: 1,634