anthropic/claude-opus-4-8

Claude Opus 4.8

Claude Opus 4.8 is Anthropic's most capable generally available model in the Opus family. It supports text, image, and file inputs with text output, with reasoning support and a 1M-token...

5/27/2026

1,000,000 tokens

#9 Text (Multi-Turn)

Input: ¥893.5745/M

Output: ¥4,467.8725/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

temperature

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-opus-4-8",
    "messages": [{"role": "user", "content": "Hello!"}]
  }'

Leaderboard

Text

🏆OverallELO: 1,473

#22

🇯🇵JapaneseELO: 1,453

#22

🇨🇳ChineseELO: 1,528

#12

🇰🇷KoreanELO: 1,446

#14

🇬🇧EnglishELO: 1,479

#22

frenchELO: 1,500

#16

germanELO: 1,465

#28

spanishELO: 1,468

#21

russianELO: 1,488

#16

💻CodingELO: 1,530

#10

🧮MathELO: 1,476

#22

✍️Creative WritingELO: 1,459

#18

📝Instruction FollowingELO: 1,478

#15

🌶️Hard PromptsELO: 1,505

#11

💬Multi-TurnELO: 1,499

Vision

🏆OverallELO: 1,279

#13

Code

🏆OverallELO: 1,534

#14