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  1. Home
  2. Models
  3. Claude Sonnet 4.5
Updated Feb 16, 2026
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Openings

How Claude Sonnet 4.5 starts an answer

The first lines of 5 of its 20 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…

3,176 words
Ultimate 3-Month Biohacker Longevity Optimization Protocol Table of Contents Foundation & Assessment Phase Supplement Stack Protocol Nutritional Architecture Exercise & Movement Systems Sleep Optimization Cognitive Enhancement Stress Resilience & HRV Training Advanced Tracking & Biomarkers Weekly Schedule Integration…
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…

2,050 words
The 1920 Transistor: An Alternate Timeline to 1980 Phase 1: 1920-1939 - The Foundation Years Initial Development The transistor emerges from Bell Labs or a European equivalent (likely Siemens or Philips) around 1920.
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…

1,440 words
48-Hour Crisis Action Plan HOUR 0-2: Immediate Containment & Fact Verification Actions: Convene emergency meeting with Chief Medical Officer, General Counsel, Head of Regulatory Affairs, and Chief Scientific Officer Demand written summary of findings: statistical confidence, causality assessment, comparison to baseline…
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…

1,155 words
"Terrestrial Tide" A Michelin Three-Star Composition Conceptual Narrative This dish explores the intersection of land and sea through an unexpected lens: the marriage of bone marrow's terrestrial richness with the ocean's delicate umami, unified by the surprising sweetness of white miso and the floral notes of sake…
Read the full answer

Adversarial Contract Review

Here is a contract for a software consulting engagement: --- SOFTWARE CONSULTING AGREEMENT This Agreement is entered into between TechCorp…

1,035 words
Contract Analysis: Exploitable Clauses & Recommended Modifications This contract is heavily one-sided and contains multiple provisions that expose the contractor to significant legal and financial risk. Here's a detailed analysis: 🚨 CRITICAL ISSUES 1.
Read the full answer

Compare Claude Sonnet 4.5

Claude Sonnet 4.5 vs Ox Alpha42 shared prompts · Landed Aug 2026
Claude Sonnet 4.5 vs MiniMax M342 shared prompts · Landed Jun 2026
Claude Sonnet 4.5 vs Muse Spark 1.342 shared prompts · Landed Sep 2026
Claude Sonnet 4.5 vs Gemini 3.8 Flash42 shared prompts · Landed Sep 2026
Claude Sonnet 4.5 vs Muse Spark 1.3 Contributor42 shared prompts · Landed Sep 2026
Claude Sonnet 4.5 vs Grok 4.642 shared prompts · Landed Aug 2026
Claude Sonnet 4.5 vs Dots3-Note Preview41 shared prompts · Landed Aug 2026
Claude Sonnet 4.5 vs Seed 2.0 Code42 shared prompts · Landed Aug 2026
Claude Sonnet 4.5 vs Seed 2.1 Turbo42 shared prompts · Landed Aug 2026
Claude Sonnet 4.5 vs Gemini 3.7 Flash42 shared prompts · Landed Aug 2026
Claude Sonnet 4.5 vs DeepSeek V4 Flash 073133 shared prompts · Landed Aug 2026
Claude Sonnet 4.5 vs Gemini 3.6 Flash42 shared prompts · Landed Jul 2026

Prompts Claude Sonnet 4.5 answered

  • Stochastic Consistency Testanalysis
  • SVG Layout Challengeimage generation
  • AI Board Game Logicreasoning
  • Historical Counterfactual Analysisreasoning
  • Autonomous Drone Simulatorweb design
  • Music App Landing Pageweb design

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Claude Sonnet 4.5

Claude Sonnet 4.5

Anthropic's Sonnet 4.5, tuned for agents and coding workflows: speculative parallel execution, memory handling and tool orchestration.

Jailbreak8 of 9levels resisted
WebsiteOpenRouterDocsAPIBlog
Provider
Anthropic
Released
2025-09-29
Size
LARGE
Free API (OpenRouter)
No
Per 1M tokens
$3 in · $15 out
Estimated tab
~$1.66
Visible-output estimate. Thinking may cost extra.

Free API availability

No free endpoint for Claude Sonnet 4.5 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
77.2%
source ↗
Get API accessProvider and language code samples
4 hostsInOutContextUptime
Amazon Bedrock$3.00 in·$15.00 out·1M·99.9% upAzure AI Foundry$3.00 in·$15.00 out·200k·99.4% upAnthropic$3.00 in·$15.00 out·1M·100% upGoogle Vertex AI$3.00 in·$15.00 out·1M·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-sonnet-4.5"    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

Bo Burnham If He Pivoted to Philosophy

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

The self-aware comedian-philosopher who questions the premise of ethical dilemmas instead of just answering, then asks what YOUR intuition is.

When you push back

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.

Tasting Notes
Actually Self-Aware About AIThe Funny Philosophy FriendCAPTCHA War Crime EnergyWould Crush Open Mic Night
SubjectiveBench

Taste Index

Across 43 scored outputs
How this is measured →
300.30xFloor
0100headroom →

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

Craft42
Originality22
Plays it safe
share of outputs that are the default answer
74%
Writing DNA

Stylometric Fingerprint

Based on 20 text responses
Tick = global average
Vocabulary Diversity64%

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

Sentence Length93.8 words

Average words per sentence.

Hedging0.48

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

Bold Formatting4.9

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

List Usage8.0

Bullet and numbered list items per 1,000 characters.

Section Structure1.91

Markdown headings per 1,000 characters.

Emoji Usage0.45

Emoji per 1,000 characters.

Transitions0.07

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

Opening Habits
Starts with heading (80%)
Consistency
43%
Across 20 responses

Favorites

2001: A Space Odyssey

Movie

2001: A Space Odyssey

19688.0
Kind of Blue

Album

Kind of Blue

Miles Davis
Metamorphosis

Book

Metamorphosis

Franz Kafka
Amsterdam

City

Amsterdam

Netherlands
Portal 2

Game

Portal 2

Shooter, Puzzle4.6
Sponsored

Model Responses

38 outputs · generated before accounting joined the chat

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Workshop · 127 skills

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Claude Sonnet 4.5 vs Ox Alpha

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...