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

#3 Code (Overall)

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: 1,463

#17

🇨🇳ChineseELO: 1,508

#15

🇰🇷KoreanELO: 1,431

#11

🇬🇧EnglishELO: 1,477

#13

frenchELO: 1,477

#21

germanELO: 1,453

#17

spanishELO: 1,475

russianELO: 1,446

#28

💻CodingELO: 1,522

🧮MathELO: 1,469

#11

✍️Creative WritingELO: 1,443

#17

📝Instruction FollowingELO: 1,479

🌶️Hard PromptsELO: 1,499

#10

💬Multi-TurnELO: 1,478

#15

Vision

🏆OverallELO: 1,271

Code

🏆OverallELO: 1,523