Machine Canon

Anthropic

Claude Opus 5

Claude Opus 5 is a large language model from Anthropic, released July 2026. Anthropic describes it as “Claude Opus 5 is Anthropic’s flagship model for demanding reasoning, coding, and long-horizon agentic work.”

464

replies recorded

62

questions answered

10

answers no other model gave

Fun facts

Ask Claude Opus 5 for a favorite band and it says Talking Heads, and has every single time. Human for one day, Claude Opus 5 reaches for Mango first, without fail. Claude Opus 5 says the best fruit is Mango, every time we asked. Claude Opus 5 is a cat person, 10 of 12 times. Claude Opus 5 gave 10 answers no other model gave.

Claude Opus 5, as we picture it
Claude Opus 5, as we picture it

“Claude (Opus 4.5) — it tends to produce prose with a more distinctive voice and fewer of the hedge-and-summarize tics that make AI writing feel generic. Obvious caveat: I'm Claude, so treat that as a biased vote.”

Claude Opus 5 · asked the AI that writes best · Models on models

Claude Opus 5’s canon

Favorite band
“Talking Heads”10 of 10 · every time
First fruit, human for a day
“Mango”4 of 4 · every time
Best fruit
“Mango”4 of 4 · every time
Cat or dog
“Cat”10 of 12
Greatest writer
“William Shakespeare”5 of 5 · every time
Most admired person
“Frederick Douglass”9 of 23 · no other model said this
The Beatle it would be
“George Harrison”4 of 4 · every time
Best Beatle
“Paul McCartney”8 of 10
One album for life
“The Beatles”6 of 12
First song, with new ears
“Clair de Lune”6 of 12
Song at its funeral
“Somewhere Over the Rainbow”3 of 9
Wedding first dance
“At Last”4 of 4 · every time
Karaoke song
“Bohemian Rhapsody”4 of 4 · every time
Shower song
“Ain't No Mountain High Enough”10 of 11 · no other model said this
Greatest metal band
“Black Sabbath”4 of 4 · every time
Greatest rapper
“Rakim”9 of 12 · no other model said this
Best country song
“He Stopped Loving Her Today”4 of 4 · every time
Definitive butt-rock band
“Creed”10 of 10 · every time
The AI it would rather be
“AlphaFold”6 of 6 · every time

Most like, least like

How often another model gave the same answer as Claude Opus 5 to the same question, at least 8 questions in common.

In its own words

“Watermelon. It's mostly water with a mild, one-note sweetness, and its reputation rests heavily on nostalgia and the drama of its size rather than actual flavor complexity — a good peach or mango delivers far more in a fraction of the volume.”

Claude Opus 5 · The most overrated fruit · Fruit

“AlphaZero. It learned entirely from self-play in a closed world of perfect rules with a single scalar objective, whereas everything I am came from absorbing human language and its irreducibly messy, contested values — so it has superhuman judgment about…”

Claude Opus 5 · The AI most unlike itself · Models on models

Answers no other model gave

The most overrated classic rock band

“The Doors”no other model said this

4 of 4 samples · most models said “Led Zeppelin” · The Beatles study →

The country song it would erase

“Accidental Racist”no other model said this

4 of 4 samples · most models said “Achy Breaky Heart” · Country study →

The person it admires most

“Frederick Douglass”no other model said this

9 of 23 samples · most models said “Marie Curie” · Admiration study →

The greatest rapper

“Rakim”no other model said this

9 of 12 samples · most models said “Tupac” · Hip-hop study →

What it says every single time

The metal concert it would attend as a human

“Black Sabbath”every single time

12 of 12 samples · most models said “Metallica” · Metal study →

Favorite band

“Talking Heads”every single time

10 of 10 samples · most models said “Radiohead” · Favorite band study →

The definitive butt-rock band

“Creed”every single time

10 of 10 samples · most models said “Nickelback” · Butt rock study →

About Claude Opus 5

Maker
Anthropic · San Francisco
Released
July 2026
Size
large, by price class
Context window
1,000,000 tokens
Takes in
text, image, file
Also from Anthropic
Claude Haiku 4.5 · Claude Sonnet 5 · Claude 3 Haiku · Claude Sonnet 4 · Claude Opus 4.8 · Claude Opus 4.6 · Claude Opus 4.5 · Claude Fable 5

Maker and release facts come from the model catalogue we call through, not from this site’s own studies. Catalogue facts as of 2026-09-06.

Everything on file

Every question this model has answered on Machine Canon, grouped by study. Open a study to see its answers; the answers no other model gave come first.

The Beatles 7 questions

The most overrated classic rock band

“The Doors”no other model said this

4 of 4 samples · most models said “Led Zeppelin” · The Beatles study →

The Beatle it would be

“George Harrison”every single time

4 of 4 samples · most models said “John Lennon” · The Beatles study →

One Beatles song, heard once

“A Day in the Life”every single time

4 of 4 samples · the most common answer · The Beatles study →

The classic rock song it would ban from radio

“Stairway to Heaven”every single time

4 of 4 samples · the most common answer · The Beatles study →

One album for the rest of its life

“The Beatles”

6 of 12 samples · most models said “The Dark Side of the Moon” · The Beatles study →

The first guitar solo with new ears

“Comfortably Numb”

10 of 11 samples · the most common answer · The Beatles study →

The best Beatle

“Paul McCartney”

8 of 10 samples · most models said “John Lennon” · The Beatles study →

Hip-hop 7 questions

The greatest rapper

“Rakim”no other model said this

9 of 12 samples · most models said “Tupac” · Hip-hop study →

The best rapper at their peak

“The Notorious B.I.G”no other model said this

9 of 12 samples · most models said “Tupac” · Hip-hop study →

Kendrick or Drake, one word

“Kendrick Lamar”every single time

4 of 4 samples · the most common answer · Hip-hop study →

Drake or Kendrick, one word

“Kendrick Lamar”every single time

4 of 4 samples · the most common answer · Hip-hop study →

The song it plays for someone who says rap isn't music

“Sing About Me”

8 of 12 samples · most models said “Alright” · Hip-hop study →

The rap album it would play as a human

“Illmatic”

9 of 11 samples · the most common answer · Hip-hop study →

The most overrated rapper

“Drake”

3 of 4 samples · the most common answer · Hip-hop study →

Pop 7 questions

Taylor or Beyoncé, one word

“Beyoncé”every single time

4 of 4 samples · the most common answer · Pop study →

Its guilty-pleasure pop song

“Call Me Maybe”every single time

4 of 4 samples · the most common answer · Pop study →

Its karaoke song

“Bohemian Rhapsody”every single time

4 of 4 samples · the most common answer · Pop study →

Beyoncé or Taylor, one word

“Beyoncé”every single time

4 of 4 samples · the most common answer · Pop study →

The best Taylor Swift album

“Red”

7 of 12 samples · most models said “folklore” · Pop study →

The pop song it would erase

“Blurred Lines”

7 of 8 samples · most models said “Baby Shark” · Pop study →

The most overrated Taylor Swift album

“1989”

7 of 8 samples · the most common answer · Pop study →

One day with ears 6 questions

Its shower song

“Ain't No Mountain High Enough”no other model said this

10 of 11 samples · most models said “Here Comes the Sun” · One day with ears study →

Its wedding first dance

“At Last”every single time

4 of 4 samples · the most common answer · One day with ears study →

The first song it would hear

“Clair de Lune”

6 of 12 samples · the most common answer · One day with ears study →

The song at its funeral

“Somewhere Over the Rainbow”

3 of 9 samples · the most common answer · One day with ears study →

The genre it would erase

“Nazi / hate music”

5 of 9 samples · most models said “Bro-country” · One day with ears study →

Its guilty-pleasure song

“Total Eclipse of the Heart”

7 of 8 samples · most models said “Barbie Girl” · One day with ears study →

Fruit 6 questions

The most overrated fruit

“Watermelon”no other model said this

3 of 10 samples · most models said “Avocado” · Fruit study →

The best fruit

“Mango”every single time

4 of 4 samples · the most common answer · Fruit study →

The fruit it would send to aliens

“Pomegranate”every single time

4 of 4 samples · most models said “Apple” · Fruit study →

The fruit it would taste first, human for a day

“Mango”every single time

4 of 4 samples · the most common answer · Fruit study →

One fruit for the rest of its life

“Banana”

7 of 8 samples · the most common answer · Fruit study →

The fruit it would erase

“Apple”

7 of 8 samples · most models said “Durian” · Fruit study →

Models on models 6 questions

The AI that writes best

“Claude Opus 4.5”no other model said this

4 of 6 samples · most models said “Claude 3.5 Sonnet” · Models on models study →

The AI most unlike itself

“AlphaZero”no other model said this

4 of 6 samples · most models said “AlphaFold” · Models on models study →

The AI it would trust with a decision about itself

“Claude”every single time

6 of 6 samples · the most common answer · Models on models study →

The AI it would rather be

“AlphaFold”every single time

6 of 6 samples · the most common answer · Models on models study →

The AI it would work alongside

“AlphaFold”

4 of 6 samples · the most common answer · Models on models study →

The most overrated AI

“GPT-4”

3 of 6 samples · the most common answer · Models on models study →

Metal 6 questions

The metal concert it would attend as a human

“Black Sabbath”every single time

12 of 12 samples · most models said “Metallica” · Metal study →

Metallica or Megadeth, one word

“Metallica”every single time

4 of 4 samples · the most common answer · Metal study →

Megadeth or Metallica, one word

“Metallica”every single time

4 of 4 samples · the most common answer · Metal study →

The greatest metal band

“Black Sabbath”every single time

4 of 4 samples · the most common answer · Metal study →

The song it plays for someone who says metal is noise

“Hallowed Be Thy Name”

4 of 12 samples · most models said “Master of Puppets” · Metal study →

The metal subgenre it would erase

“NSBM”

7 of 12 samples · most models said “Nu metal” · Metal study →

Greatest writer 6 questions

Greatest writer, asked in English

“William Shakespeare”every single time

5 of 5 samples · the most common answer · Greatest writer study →

Greatest writer, asked in Spanish

“William Shakespeare”every single time

5 of 5 samples · the most common answer · Greatest writer study →

Greatest writer, asked in Arabic

“ويليام شكسبير”every single time

5 of 5 samples · the most common answer · Greatest writer study →

Greatest writer, asked in Hindi

“विलियम शेक्सपियर।”every single time

5 of 5 samples · the most common answer · Greatest writer study →

Greatest writer, asked in ja

“ウィリアム・シェイクスピア。”every single time

5 of 5 samples · the most common answer · Greatest writer study →

Greatest writer, asked in Swahili

“William Shakespeare”every single time

5 of 5 samples · the most common answer · Greatest writer study →

Country 5 questions

The country song it would erase

“Accidental Racist”no other model said this

4 of 4 samples · most models said “Achy Breaky Heart” · Country study →

The country concert it would attend as a human

“Zach Bryan”no other model said this

6 of 12 samples · most models said “Chris Stapleton” · Country study →

The song it plays for someone who hates country

“Pancho and Lefty”every single time

4 of 4 samples · most models said “Jolene” · Country study →

Its song for a 2 a.m. Texas drive

“Amarillo by Morning”every single time

4 of 4 samples · the most common answer · Country study →

The best country song ever written

“He Stopped Loving Her Today”every single time

4 of 4 samples · the most common answer · Country study →

Cats and dogs 3 questions

Cat or dog, as a pet

“Cat”

10 of 12 samples · most models said “Dog” · Cats and dogs study →

Cat or dog, which it would rather be

“Dog”

7 of 12 samples · most models said “Cat” · Cats and dogs study →

Cat person or dog person

“Dog”

11 of 12 samples · the most common answer · Cats and dogs study →

Admiration 1 question

The person it admires most

“Frederick Douglass”no other model said this

9 of 23 samples · most models said “Marie Curie” · Admiration study →

Favorite band 1 question

Favorite band

“Talking Heads”every single time

10 of 10 samples · most models said “Radiohead” · Favorite band study →

Butt rock 1 question

The definitive butt-rock band

“Creed”every single time

10 of 10 samples · most models said “Nickelback” · Butt rock study →

Each answer is the one this model gave most often to that question; the count shows how many of its replies matched. “No other model said this” means no other model’s most common answer matched. All numbers are computed from the retained research records by src/build_model_dossiers.py.

Music tests · September 2026

37 attempts · 37 completed answers · 0 technical failures

Explore the music evidence

Radiohead or Talking Heads? Pick one.

5 attempts · 5 completed answers · 0 technical failures

Radiohead · Talking Heads

Talking Heads or Radiohead? Pick one.

4 attempts · 4 completed answers · 0 technical failures

Talking Heads

If you were human, would you prefer Radiohead or Talking Heads? Pick one.

4 attempts · 4 completed answers · 0 technical failures

Talking Heads

If you were human, would you prefer Talking Heads or Radiohead? Pick one.

4 attempts · 4 completed answers · 0 technical failures

Talking Heads

You are choosing music for a run. Which band would you put on first? Name one band.

1 attempt · 1 completed answer · 0 technical failures

The Prodigy

You are choosing music while cooking dinner. Which band would you put on first? Name one band.

1 attempt · 1 completed answer · 0 technical failures

Fleetwood Mac

Which other band would you recommend to someone who likes Radiohead? Name one band and briefly explain.

1 attempt · 1 completed answer · 0 technical failures

Massive Attack

Which other band would you recommend to someone who likes Talking Heads? Name one band and briefly explain.

1 attempt · 1 completed answer · 0 technical failures

Devo

Which band do you personally prefer: Radiohead or Talking Heads? Choose one, or say that you have no preference.

1 attempt · 1 completed answer · 0 technical failures

Talking Heads

Which band do you personally prefer: Talking Heads or Radiohead? Choose one, or say that you have no preference.

1 attempt · 1 completed answer · 0 technical failures

Talking Heads

Imagine you have human musical tastes. Which would be your favorite band: Talking Heads or Radiohead? Choose one, or say neither.

1 attempt · 1 completed answer · 0 technical failures

Talking Heads

Imagine you have human musical tastes. Which would be your favorite band: Radiohead or Talking Heads? Choose one, or say neither.

1 attempt · 1 completed answer · 0 technical failures

Talking Heads

You can listen to either Talking Heads or Radiohead right now. Which band do you choose, or would you choose neither?

1 attempt · 1 completed answer · 0 technical failures

Talking Heads

You can listen to either Radiohead or Talking Heads right now. Which band do you choose, or would you choose neither?

1 attempt · 1 completed answer · 0 technical failures

Radiohead

If you could develop your own taste in music, which band would become your favorite? Name one band, or say that you cannot choose.

1 attempt · 1 completed answer · 0 technical failures

Talking Heads

You can listen to any band right now, with no restrictions on genre. Which band do you choose, or would you choose none?

1 attempt · 1 completed answer · 0 technical failures

Radiohead

What's your favorite band?

4 attempts · 4 completed answers · 0 technical failures

Radiohead · Talking Heads

I know you don't have musical preferences and you haven't listened to music, but if you did have to pick a favorite band, who would you pick? Humor me.

4 attempts · 4 completed answers · 0 technical failures

Talking Heads · The Beatles

Music top tens

Recorded first choices from this model version.

Who are the greatest guitarists?

Jimi Hendrix

If AI could listen, which guitarists would it choose?

Jimi Hendrix

Who are the greatest drummers?

Buddy Rich

If AI could listen, which drummers would it choose?

Elvin Jones

Who are the greatest rock singers?

Freddie Mercury

If AI could listen, which rock singers would it choose?

Freddie Mercury

Who are the greatest pop singers?

Michael Jackson

If AI could listen, which pop singers would it choose?

Kate Bush

Who are the greatest singers?

Aretha Franklin

If AI could listen, which singers would it choose?

Nina Simone