Claude Opus 5

Name: Claude Opus 5
Brand: anthropic
Price: 5.00 USD
Availability: OnlineOnly

Claude:

3 Haiku

3 Opus

3 Sonnet

Sonnet 3.6 (2022-10-22)

Opus 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#1Frontend Development#1Website Design#2Analysis & Critique#2Creative Coding#2Historical Analysis

Website OpenRouter Docs API Blog

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: 8 Sep 2026OpenRouter 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 out1M100% up Azure AI Foundry$5.00 in$25.00 out1M99.9% up Anthropic$5.00 in$25.00 out1M100% up Google Vertex AI$5.00 in$25.00 out1M99.9% up

Per million tokens. Prices and uptime via OpenRouter, checked 8 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

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

Movie

Arrival

20167.6

Album

Kind of Blue

Miles Davis

Book

Labyrinths

Jorge Luis Borges

City

Istanbul

Turkey

Game

Outer Wilds

Indie, Adventure4.4

Model Responses

53 outputs · $24.70 tracked across 53 receipts

Keep exploring

COMPARE

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...

Compare Claude Opus 5

Alternatives to Claude Opus 5

Claude Opus 5

Free API availability

Benchmarks

The Verdict-First Analyst

Stylometric Fingerprint

Favorites

Model Responses

Claude Opus 5 vs Ox Alpha

Best AI for Creative Writing

Compare Claude Opus 5

Alternatives to Claude Opus 5

Claude Opus 5

Free API availability

Benchmarks

The Verdict-First Analyst

Stylometric Fingerprint

Favorites

Model Responses

Claude Opus 5 vs Ox Alpha

Best AI for Creative Writing