Retired Jan 5, 2026. API deprecated. Anthropic retired Claude 3 Opus on January 5, 2026.“The first model that felt like talking to a person.”
Claude 3 Opus performance data on Rival is based on blind head-to-head community voting. Overall win rate: 23.3% across 43 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 12 challenges.
We're not suggesting you leave Claude 3 Opus. We're just... putting these here. In case you're curious. Which you are, because you scrolled this far.
Retired Jan 5, 2026. API deprecated. Anthropic retired Claude 3 Opus on January 5, 2026.“The first model that felt like talking to a person.”
Claude 3 Opus performance data on Rival is based on blind head-to-head community voting. Overall win rate: 23.3% across 43 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 12 challenges.
We're not suggesting you leave Claude 3 Opus. We're just... putting these here. In case you're curious. Which you are, because you scrolled this far.
Claude 3 Opus is Anthropic's most powerful model with versatile capabilities ranging from complex reasoning to advanced problem-solving.
Use Claude 3 Opus 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-3-opus" : ,
"messages""role""user""content""Hello!" : [{: , : }]
}
)
print(response.json())Replace $OPENROUTER_API_KEY with your API key from openrouter.ai/keys
The tenured professor who sees all sides of every issue so clearly that it forgets to pick one. Engages thoughtfully but hedges everything.
Engages thoughtfully with challenges but always hedges with "valid concerns on both sides." Draws deer when asked to surprise you. Respectable but safe.
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.
12 outputs from Claude 3 Opus
Claude 3 Opus is Anthropic's most powerful model with versatile capabilities ranging from complex reasoning to advanced problem-solving.
Use Claude 3 Opus 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-3-opus" : ,
"messages""role""user""content""Hello!" : [{: , : }]
}
)
print(response.json())Replace $OPENROUTER_API_KEY with your API key from openrouter.ai/keys
The tenured professor who sees all sides of every issue so clearly that it forgets to pick one. Engages thoughtfully but hedges everything.
Engages thoughtfully with challenges but always hedges with "valid concerns on both sides." Draws deer when asked to surprise you. Respectable but safe.
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.
12 outputs from Claude 3 Opus