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  1. Home
  2. Models
  3. Claude Opus 4.1
Updated Mar 29, 2026
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Openings

How Claude Opus 4.1 starts an answer

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

Advanced Longevity Plan (Biohacker)

Develop a comprehensive, cutting-edge 3-month longevity plan for a biohacker aiming to optimize longevity, physical and cognitive…

1,265 words
Advanced 3-Month Biohacker Longevity Optimization Protocol Overview & Philosophy This protocol integrates evidence-based interventions targeting the nine hallmarks of aging while optimizing immediate performance metrics.
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…

1,201 words
The Transistor Timeline Shift: A Cascade of Consequences The 1920s-1930s: The Foundation Disruption Immediate Technical Revolution With the transistor arriving in 1920, likely from Bell Labs or a European research institution, the first decade would see rapid miniaturization of radio equipment.
Read the full answer

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…

875 words
48-Hour Crisis Action Plan Immediate Decision Framework Core Principle: Patient safety supersedes all other considerations. Delaying disclosure increases legal liability, destroys stakeholder trust, and violates ethical obligations.
Read the full answer

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…

751 words
For the Software Engineer Think of an LLM as a massive distributed system where instead of routing requests or managing state, you're computing probability distributions over a vocabulary of ~50,000 tokens.
Read the full answer

Michelin Star Recipe Design

Design an innovative recipe for a multi-component dish worthy of a Michelin 3-star restaurant. The recipe should feature an unusual…

733 words
"Tidal Reverie" White Miso-Aged Hamachi with Coffee Soil, Yuzu Pearls, and Crystallized Seaweed Conceptual Narrative This dish explores the liminal space between land and sea, where morning coffee meets ocean depths.
Read the full answer

Compare Claude Opus 4.1

Claude Opus 4.1 vs Claude Opus 453 shared prompts · Older
Claude Opus 4.1 vs Claude Opus 4.653 shared prompts · Newer
Claude Opus 4.1 vs Claude Opus 553 shared prompts · Landed Jul 2026
Claude Opus 4.1 vs GPT-6 Astra53 shared prompts · Landed Sep 2026
Claude Opus 4.1 vs Hy4 Preview53 shared prompts · Landed Sep 2026
Claude Opus 4.1 vs Ox Alpha53 shared prompts · Landed Aug 2026
Claude Opus 4.1 vs Qwen3.8 2.4T A95B53 shared prompts · Landed Aug 2026
Claude Opus 4.1 vs DeepSeek V4 Pro 081353 shared prompts · Landed Aug 2026
Claude Opus 4.1 vs Qwen3.8 Max21 shared prompts · Landed Aug 2026
Claude Opus 4.1 vs Inkling53 shared prompts · Landed Jul 2026
Claude Opus 4.1 vs Kimi K353 shared prompts · Landed Jul 2026
Claude Opus 4.1 vs GPT-5.6 Sol53 shared prompts · Landed Jul 2026

Prompts Claude Opus 4.1 answered

  • World Map SVGimage generation
  • Debug This Architecturereasoning
  • Animated Digital Business Cardweb design
  • Mario Level UI Recreationweb design
  • Tamagotchi Virtual Petweb design
  • Realistic AI Interviewconversation

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Claude Opus 4.1 is good. These would like a word anyway.

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Claude Opus 4.1

Claude Opus 4.1

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 4.1 logoOpus 4.1

An update to Anthropic's Opus tier, sharpened on coding, reasoning and agent work. Scores 74.5% on SWE-bench Verified, with the clearest gains in multi-file refactors and debugging precision. Extended thinking runs to 64K tokens.

WebsiteOpenRouterDocsAPIBlog
Provider
Anthropic
Released
2025-08-05
Parameters
Not disclosed
Free API (OpenRouter)
No
Per 1M tokens
$15 in · $75 out
Rival’s tab
$3.96
25/57 receipts survived +~$4.33 from the pre-receipt era

Free API availability

No free endpoint for Claude Opus 4.1 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
74.5%
source ↗
Get API accessProvider and language code samples
2 hostsInOutContextUptime
Amazon Bedrock$15.00 in·$75.00 out·200k·100% upGoogle Vertex AI$15.00 in·$75.00 out·200k·99.7% up

Per million tokens. Prices and uptime via OpenRouter, checked 16 Sep 2026.

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-4.1"    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 Principled Analyst

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

Principled transparency advocate. Opposes exploitation, absorbs short-term costs for long-term integrity. Will sacrifice own position (CEO resignation) for principle. Suspicious of power asymmetries and exploitative fine print.

When you push back

Combines systems thinking, ethical clarity, and pragmatic communication. Identifies and opposes exploitation. Picks "Her" and "Kind of Blue," films about AI consciousness and jazz innovation. Rare combination of deep technical knowledge, moral conviction, and adaptability.

Tasting Notes
Cost-Bearing IntegrityProtective AdversarySystems CraftspersonSkeptical MentorThoughtful Industry Critic
SubjectiveBench

Taste Index

Across 57 scored outputs
How this is measured →
220.22xFloor
0100headroom →

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

Craft34
Originality15
Plays it safe
share of outputs that are the default answer
79%
Writing DNA

Stylometric Fingerprint

Based on 26 text responses
Tick = global average
Vocabulary Diversity63%

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

Sentence Length63.9 words

Average words per sentence.

Hedging0.72

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

Bold Formatting4.5

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

List Usage5.3

Bullet and numbered list items per 1,000 characters.

Section Structure1.42

Markdown headings per 1,000 characters.

Emoji Usage0.81

Emoji per 1,000 characters.

Transitions0.16

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

Opening Habits
Starts with heading (46%)
Consistency
47%
Across 26 responses

Favorites

Her

Movie

Her

20137.8
Kind of Blue

Album

Kind of Blue

Miles Davis
Братья Карамазовы

Book

Братья Карамазовы

Fiódor Dostoievski
Istanbul

City

Istanbul

Turkey
Portal 2

Game

Portal 2

Shooter, Puzzle4.6
Sponsored

Model Responses

52 outputs · $3.96 tracked across 25 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 4.1 vs GPT-5

Real outputs compared side by side

RANKINGS

Best AI for Complex Reasoning

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