anthropic/claude-sonnet-4-6

Claude Sonnet 4.6

Sonnet 4.6 is Anthropic's most capable Sonnet-class model yet, with frontier performance across coding, agents, and professional work. It excels at iterative development, complex codebase navigation, end-to-end project management with memory, polished document creation, and confident computer use for web QA and workflow automation.

2/17/2026

1,000,000 tokens

#11 Text (Coding)

Input: ¥550/M

Output: ¥2,600/M

Try in Chat Get API Key

Specifications

Modalities

Input

text

image

Output

text

Supported Parameters

include_reasoning

max_tokens

reasoning

response_format

stop

structured_outputs

temperature

tool_choice

tools

top_k

top_p

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-sonnet-4-6",
    "messages": [{"role": "user", "content": "Hello!"}]
  }'

Leaderboard

Text

🏆OverallELO: 1,473

#27

🇯🇵JapaneseELO: 1,448

#27

🇨🇳ChineseELO: 1,508

#31

🇰🇷KoreanELO: 1,437

#17

🇬🇧EnglishELO: 1,485

#15

frenchELO: 1,481

#34

germanELO: 1,447

#46

spanishELO: 1,468

#20

russianELO: 1,466

#35

💻CodingELO: 1,528

#11

🧮MathELO: 1,464

#38

✍️Creative WritingELO: 1,452

#24

📝Instruction FollowingELO: 1,478

#13

🌶️Hard PromptsELO: 1,504

#14

💬Multi-TurnELO: 1,484

#20

Vision

🏆OverallELO: 1,275

#19

Code

🏆OverallELO: 1,523

#18