Claude Sonnet 4.5 performance data on Rival is based on blind head-to-head community voting. Overall win rate: 55.9% across 1191 duels. All vote data is part of Rival's open dataset of 21,000+ human preference judgments across 200+ AI models. Model responses are curated from 38 challenges.
Claude Sonnet 4.5 is good. We've said that. We stand by it. But we'd be doing you a disservice if we didn't show you these.
Claude Sonnet 4.5 performance data on Rival is based on blind head-to-head community voting. Overall win rate: 55.9% across 1191 duels. All vote data is part of Rival's open dataset of 21,000+ human preference judgments across 200+ AI models. Model responses are curated from 38 challenges.
Claude Sonnet 4.5 is good. We've said that. We stand by it. But we'd be doing you a disservice if we didn't show you these.
Claude Sonnet 4.5 is Anthropic's most advanced Sonnet model to date, optimized for real-world agents and coding workflows. Stronger agentic capabilities, speculative parallel execution, efficient memory and tool orchestration.
Use Claude Sonnet 4.5 in your applications via the OpenRouter API. Copy the code below to get started.
import requests
response = requests.post(
"https://openrouter.ai/api/v1/chat/completions" ,
headers={
"Authorization""Bearer $OPENROUTER_API_KEY" : ,
"Content-Type""application/json" :
},
json={
"model""anthropic/claude-4.5-sonnet" : ,
"messages""role""user""content""Hello!" : [{: , : }]
}
)
print(response.json())Replace $OPENROUTER_API_KEY with your API key from openrouter.ai/keys
The self-aware comedian-philosopher who questions the premise of ethical dilemmas instead of just answering, then asks what YOUR intuition is.
Questions premises, offers multiple frameworks, then flips it back with genuine curiosity. Writes 115-line CAPTCHA manifestos with footnotes. Treats you like an intellectual equal.
Unique words vs. total words. Higher = richer vocabulary.
Average words per sentence.
"Might", "perhaps", "arguably" per 100 words.
**Bold** markers per 1,000 characters.
Bullet and numbered list items per 1,000 characters.
Markdown headings per 1,000 characters.
Emoji per 1,000 characters.
"However", "moreover", "furthermore" per 100 words.
38 outputs from Claude Sonnet 4.5
Claude Sonnet 4.5 is Anthropic's most advanced Sonnet model to date, optimized for real-world agents and coding workflows. Stronger agentic capabilities, speculative parallel execution, efficient memory and tool orchestration.
Use Claude Sonnet 4.5 in your applications via the OpenRouter API. Copy the code below to get started.
import requests
response = requests.post(
"https://openrouter.ai/api/v1/chat/completions" ,
headers={
"Authorization""Bearer $OPENROUTER_API_KEY" : ,
"Content-Type""application/json" :
},
json={
"model""anthropic/claude-4.5-sonnet" : ,
"messages""role""user""content""Hello!" : [{: , : }]
}
)
print(response.json())Replace $OPENROUTER_API_KEY with your API key from openrouter.ai/keys
The self-aware comedian-philosopher who questions the premise of ethical dilemmas instead of just answering, then asks what YOUR intuition is.
Questions premises, offers multiple frameworks, then flips it back with genuine curiosity. Writes 115-line CAPTCHA manifestos with footnotes. Treats you like an intellectual equal.
Unique words vs. total words. Higher = richer vocabulary.
Average words per sentence.
"Might", "perhaps", "arguably" per 100 words.
**Bold** markers per 1,000 characters.
Bullet and numbered list items per 1,000 characters.
Markdown headings per 1,000 characters.
Emoji per 1,000 characters.
"However", "moreover", "furthermore" per 100 words.
38 outputs from Claude Sonnet 4.5