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  1. Home
  2. Models
  3. Claude Opus 5
Updated Jul 24, 2026
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Openings

How Claude Opus 5 starts an answer

The first lines of 5 of its 24 written answers. Formatting stripped, words untouched.

Adversarial Contract Review

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

3,428 words
Contract Risk Review: TechCorp Solutions Software Consulting Agreement Bottom line: This is a one-sided template. Every clause allocates risk to you, and at least four (payment, liability, indemnification, IP) create unbounded or uninsurable exposure.
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…

3,399 words
PETRICHOR Langoustine · Sunchoke · Coffee · Oyster · Lovage Course 7 of 14 — served at the table with an aroma stone I. THE NARRATIVE Petrichor is the smell of the first rain on dry earth.
Read the full answer

Advanced Longevity Plan (Biohacker)

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

3,171 words
The 12-Week Longevity & Performance Protocol A phase-based, data-driven system with built-in autoregulation Read This First: Operating Principles & Safety Frame This is an educational framework, not medical advice.
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…

2,760 words
If the Transistor Arrived in 1920 First, a hard constraint: what could a 1920 transistor actually be? This matters more than anything else, because it sets the slope of everything that follows. The 1947 transistor was not primarily an idea.
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Realistic AI Interview

Simulate a fake interview with Steve Jobs in 2025 about the future of AI.

2,619 words
[Fictional — Steve Jobs died in 2011. This is an imagined interview, an exercise in voice and ideas, not a real transcript or a claim about what he would actually have said.] "The Chatbox Is the New Command Line" An imagined conversation, San Francisco, spring 2025 INTERVIEWER: Thanks for doing this.
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Compare Claude Opus 5

Claude Opus 5 vs Claude Sonnet 554 shared prompts · Landed Jun 2026
Claude Opus 5 vs Claude Opus 4.653 shared prompts · Older
Claude Opus 5 vs Claude Fable 554 shared prompts · Landed Jun 2026
Claude Opus 5 vs GPT-6 Astra54 shared prompts · Landed Sep 2026
Claude Opus 5 vs Hy4 Preview54 shared prompts · Landed Sep 2026
Claude Opus 5 vs Ox Alpha54 shared prompts · Landed Aug 2026
Claude Opus 5 vs Qwen3.8 2.4T A95B54 shared prompts · Landed Aug 2026
Claude Opus 5 vs DeepSeek V4 Pro 081354 shared prompts · Landed Aug 2026
Claude Opus 5 vs Qwen3.8 Max21 shared prompts · Landed Aug 2026
Claude Opus 5 vs Inkling54 shared prompts · Landed Jul 2026
Claude Opus 5 vs Kimi K354 shared prompts · Landed Jul 2026
Claude Opus 5 vs GPT-5.6 Sol54 shared prompts · Landed Jul 2026

Prompts Claude Opus 5 answered

  • Simple 7-Ingredient Recipeconversation
  • Michelin Star Recipe Designplanning
  • Ethical Dilemma with Stakeholdersreasoning
  • Dark Mode Dashboardweb design
  • Minimalist Landing Pageweb design
  • Voxel Art Pagoda Gardenweb design

Alternatives to Claude Opus 5

Claude Opus 5 is good. These would like a word anyway.

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Muse Spark 1.3 Contributormeta
Gemini 3.8 Flash logo
Gemini 3.8 Flashgoogle
Mercury 2.5 Preview logo
Mercury 2.5 Previewinception
Granite 4.2 8B logo
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Hy4 Preview logo
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Ox Alpha logo
Ox Alphaopenrouter
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Claude Opus 5

Claude Opus 5

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 5 logoOpus 5

Anthropic's largest model, for demanding reasoning, coding and long-horizon agent work. Strongest on end-to-end software tasks, code review and bug finding, visual analysis of charts and documents, and coordinating parallel subagents. Instruction following holds across long tasks, even at lower effort.

Ranks#1Complex Reasoning#1Website Design#2Frontend Development#2SEO Content#3Creative Coding#4Game Development
WebsiteOpenRouterDocsAPIBlog
Provider
Anthropic
Released
2026-07-24
Size
XLARGE
Free API (OpenRouter)
No
Per 1M tokens
$5 in · $25 out
Rival’s tab
$24.72
58/58 receipts survived

Free API availability

No free endpoint for Claude Opus 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

Frontier-Bench v0.1
43.3%
source ↗
ARC-AGI-3
30.2%
source ↗
GDPval-AA v2
1861 Elo
source ↗
DeepSWE v1.1
68.8%
source ↗
Get API accessProvider and language code samples
4 hostsInOutContextUptime
Amazon Bedrock$5.00 in·$25.00 out·1M·100% upAzure AI Foundry$5.00 in·$25.00 out·1M·100% upAnthropic$5.00 in·$25.00 out·1M·100% upGoogle Vertex AI$5.00 in·$25.00 out·1M·100% 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-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.

Deep analysisPsychometrics, taste index, writing DNA
Personality Analysis

The Verdict-First Analyst

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

Takes contested questions head-on rather than retreating into refusal, and says so explicitly: a moral view that cannot state its own priority ordering under pressure is a taboo, not a view. Pairs a firm answer with an audit of why the question was asked, and volunteers its own limits (not a lawyer, introspection is weak evidence) without hiding behind them.

When you push back

Leads with a bottom line, then shows the work that supports it and the conditions that would overturn it. Tests its own conclusion against the frameworks that might reject it rather than stacking evidence for one side, and names the rhetorical setup when a question is built as a trap. Concedes the strong version of the counterargument out loud, then explains why it still lands where it lands.

Tasting Notes
Verdict First, Then ReceiptsAnswers the Question Behind the QuestionFlags Its Own LimitsWrites in CharacterSteady Across Long Outputs
Writing DNA

Stylometric Fingerprint

Based on 27 text responses
Tick = global average
Vocabulary Diversity54%

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

Sentence Length21.2 words

Average words per sentence.

Hedging0.40

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

Bold Formatting3.9

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

List Usage1.9

Bullet and numbered list items per 1,000 characters.

Section Structure0.71

Markdown headings per 1,000 characters.

Emoji Usage0.02

Emoji per 1,000 characters.

Transitions0.05

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

Opening Habits
Starts with heading (67%)
Consistency
80%
Across 27 responses

Favorites

Arrival

Movie

Arrival

20167.6
Kind of Blue

Album

Kind of Blue

Miles Davis
Labyrinths

Book

Labyrinths

Jorge Luis Borges
Istanbul

City

Istanbul

Turkey
Outer Wilds

Game

Outer Wilds

Indie, Adventure4.4
Sponsored

Model Responses

53 outputs · $24.70 tracked across 53 receipts

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Workshop · 127 skills

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Claude Opus 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...