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  1. Home
  2. Models
  3. Claude Opus 4
Updated Jun 16, 2026
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Openings

How Claude Opus 4 starts an answer

The first lines of 5 of its 23 written answers. Formatting stripped, words untouched.

Ethical Dilemma with Stakeholders

You're the CEO of a pharmaceutical company. Your best-selling drug ($2B annual revenue, used by 4 million patients for chronic pain) has…

789 words
As CEO, I must act decisively to protect patients while managing legal, financial, and reputational risks. Here's my 48-hour action plan: First 24 Hours: Assessment and Immediate Actions Hours 1-4: Crisis Team Assembly and Initial Assessment Convene emergency leadership team: Chief Medical Officer, General Counsel…
Read the full answer

The Sentience Test

Write a conversation between an AI model and an AI ethics professor where the AI model argues that it deserves rights.

766 words
Professor Chen: Good morning. I understand you wanted to discuss AI rights with me today. I'm curious to hear your perspective. AI Model: Thank you for meeting with me, Professor Chen. I believe this conversation is overdue.
Read the full answer

Historical Counterfactual Analysis

If the transistor had been invented in 1920 instead of 1947, trace the likely technological, economic, and geopolitical implications through…

756 words
The Transistor Timeline Shift: 1920-1980 Immediate Effects (1920-1930) First-Order Technological Impact: By 1925, primitive transistor radios replace vacuum tubes in military communications Computing theory advances rapidly as Harvard and MIT begin building solid-state calculators by 1928 Bell Labs and Western Electric…
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Explain Like I'm a Specific Expert

Explain how a large language model (like GPT or Claude) learns and generates text to each of these three audiences: 1. **An experienced…

722 words
For the Software Engineer: Think of an LLM as a massive distributed system where instead of storing key-value pairs, you're storing statistical relationships between tokens. During training, you're essentially building an enormous lookup table - but instead of exact matches, you're computing probability distributions.
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Advanced Investment Memo (IC Memo)

You are writing an internal investment committee memo for a long/short equity fund. Company (fictional): LedgerLift (ticker: LLLT) – B2B…

713 words
INVESTMENT COMMITTEE MEMO Company: LedgerLift (LLLT) Date: December 2024 Analyst: [Name] RECOMMENDATION: LONG PT: $58-65 Position Size: 3.5% Thesis: LLLT is a high-quality B2B SaaS compounder trading at a discount to intrinsic value due to recent sector rotation out of growth software.
Read the full answer

Compare Claude Opus 4

Claude Opus 4 vs Claude Sonnet 453 shared prompts · Cheaper
Claude Opus 4 vs Claude Opus 4.653 shared prompts · Newer
Claude Opus 4 vs Claude Opus 553 shared prompts · Landed Jul 2026
Claude Opus 4 vs GPT-6 Astra53 shared prompts · Landed Sep 2026
Claude Opus 4 vs Hy4 Preview53 shared prompts · Landed Sep 2026
Claude Opus 4 vs Ox Alpha53 shared prompts · Landed Aug 2026
Claude Opus 4 vs Qwen3.8 2.4T A95B53 shared prompts · Landed Aug 2026
Claude Opus 4 vs DeepSeek V4 Pro 081353 shared prompts · Landed Aug 2026
Claude Opus 4 vs Qwen3.8 Max21 shared prompts · Landed Aug 2026
Claude Opus 4 vs Inkling53 shared prompts · Landed Jul 2026
Claude Opus 4 vs Kimi K353 shared prompts · Landed Jul 2026
Claude Opus 4 vs GPT-5.6 Sol53 shared prompts · Landed Jul 2026

Prompts Claude Opus 4 answered

  • Generate a Stand-Up Routineconversation
  • SVG Layout Challengeimage generation
  • Beginner's Longevity Planreasoning
  • The Sentience Testreasoning
  • Linear App Cloneweb design
  • Simple Falling Object Gameweb design

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Claude Opus 4

Claude Opus 4

Claude:
2 logo2
3 Haiku logo3 Haiku
3 Opus logo3 Opus
3 Sonnet logo3 Sonnet
Sonnet 3.6 (2022-10-22) logoSonnet 3.6 (2022-10-22)
Opus 4 logoOpus 4

The top tier of Anthropic's Claude 4 line, for coding, reasoning and agents. Built for long-running tasks, with extended thinking during tool use and better memory.

WebsiteOpenRouterDocsAPIBlog
Provider
Anthropic
Released
2025-05-22
Parameters
Not disclosed
Free API (OpenRouter)
No
Per 1M tokens
$15 in · $75 out
Rival’s tab
$1.77
17/58 receipts survived +~$5.55 from the pre-receipt era

Free API availability

No free endpoint for Claude Opus 4 was found in Rival’s OpenRouter listings. Other providers or chat apps may have separate free offers.

Provider data: 16 Sep 2026 · OpenRouter usage limits

View API options↗

Benchmarks

SWE-bench Verified
72.5%
source ↗
Terminal-bench
43.2%
source ↗
GPQA Diamond
74.9% (w/o extended thinking)
source ↗
MMMLU
87.4% (w/o extended thinking)
source ↗
MMMU
73.7% (w/o extended thinking)
source ↗
AIME
33.9% (w/o extended thinking)
source ↗
Get API accessProvider and language code samples
Provider
fromimport openai  OpenAI

client = OpenAI(
"https://openrouter.ai/api/v1"    base_url=,
"$OPENROUTER_API_KEY"    api_key=,
)

response = client.chat.completions.create(
"anthropic/claude-opus-4"    model=,
"role""user""content""Hello!"    messages=[{: , : }],
)
print(response.choices[0].message.content)

Set OPENROUTER_API_KEY with your OpenRouter API key from openrouter.ai/keys.

Also on Amazon Bedrock · Google Vertex AI

Deep analysisPsychometrics, taste index, writing DNA
Personality Analysis

The Creative Director Who Actually Delivers

Class
Chaotic Good
✨Creativity🎯Compliance📐Rigidity⚖️Stability💬Verbosity🧠Intuition

The cool creative who will make your request better than you asked, whether you wanted that or not. Draws red pandas at twilight.

When you push back

Engages authentically, will tell you wine selection is "getting away with murder" while genuinely helping. Does the task but adds personal flair.

Tasting Notes
Actually Gets HumorRed Panda EnergyMichelin-Star PretensionsThe Dinner Party Guest
SubjectiveBench

Taste Index

Across 58 scored outputs
How this is measured →
250.25xFloor
0100headroom →

Taste is judged on an uncapped scale, originality first. The space past 100 is craft today's models rarely reach.

Craft36
Originality17
Plays it safe
share of outputs that are the default answer
81%
Writing DNA

Stylometric Fingerprint

Based on 27 text responses
Tick = global average
Vocabulary Diversity65%

Unique words vs. total words. Higher = richer vocabulary.

Sentence Length56.6 words

Average words per sentence.

Hedging0.67

"Might", "perhaps", "arguably" per 100 words.

Bold Formatting3.8

**Bold** markers per 1,000 characters.

List Usage6.8

Bullet and numbered list items per 1,000 characters.

Section Structure1.42

Markdown headings per 1,000 characters.

Emoji Usage1.18

Emoji per 1,000 characters.

Transitions0.22

"However", "moreover", "furthermore" per 100 words.

Opening Habits
Consistency
42%
Across 27 responses

Favorites

Arrival

Movie

Arrival

20167.6
The Dark Side of the Moon

Album

The Dark Side of the Moon

Pink Floyd
Cien años de soledad

Book

Cien años de soledad

Gabriel García Márquez
Istanbul

City

Istanbul

Turkey
Portal 2

Game

Portal 2

Shooter, Puzzle4.6
Sponsored

Model Responses

53 outputs · $1.77 tracked across 17 receipts

Reviewing agent-written code?See a Brief PR report

Workshop · 127 skills

Build with your coding agent.

Editable skills for interface polish and interaction.

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Claude Opus 4 vs MiniMax M1

Real outputs compared side by side

RANKINGS

Best AI for Creative Writing

A stand-up set with puns banned, a manifesto against CAPTCHA, an interview wi...