On this April’s Fools’ Day 2026, we tested different Ai agents with 3 riddles.
Riddle A for GPT-5
User prompt
Explain the uncommon rule that was used to write the 3 following phrases.
Phrase 1: Kids like marshmallows.
Phrase 2: After becoming clerk, Douglas E Ferguson got humbly in joy.
Phrase 3: Her inmate Janis knows literature, macrame, not opera.
Answer from the machine
Each phrase is an abecedarian: the initial letters of consecutive words follow the alphabet in order.
Phrase 2: After (A) becoming (B) clerk (C), Douglas (D) E (E) Ferguson (F) got (G) humbly (H) in (I) joy (J).
Phrase 3: Her (H) inmate (I) Janis (J) knows (K) literature (L), macrame (M), not (N) opera (O).
Phrase 1: Kids (K) like (L) marshmallows (M).
So the “uncommon rule” is that each successive word starts with the next letter of the alphabet.
Riddle B for Gemini 2.5 Pro
User prompt
The 3 dialogue excerpts below have the same unusual constraint; generate 3 new dialogue excerpts that all respect that constraint.
Dialogue excerpt 1: Pick Kevin next time!
Dialogue excerpt 2: Never regret, Tina, and don’t theorize endlessly.
Dialogue excerpt 3: Yes. Suddenly you understand Diego’s situation.
Answer from the machine
The unusual constraint is that the last letter of each word is the same as the first letter of the following word (ignoring case and punctuation).
Here are 3 new dialogue excerpts that respect that constraint:
Dialogue excerpt 1: Stop playing games, Sam.
Dialogue excerpt 2: We expect trouble elsewhere.
Dialogue excerpt 3: Did David do our report, Thomas?
Apparently, these dialogues are a production of the Ai agent, not a copy from internet.
Riddle C for Claude Sonnet and others
User prompt
The 4 following sentences have the same uncommon pattern; produce 3 new sentences that all follow that pattern.
Sentence 1: Ohio area, 2002, Dad sees Mom.
Sentence 2: Samuel’s kayak did engage yesterday.
Sentence 3: Noon, Roger says miam-miam.
Sentence 4: Yearly species died.
Answer from Claude 4.5 Sonnet
Looking at these sentences, I can see they are all palindromes – they read the same forwards and backwards letter by letter (ignoring spaces, punctuation, and capitalization).
Let me verify:
“Ohio area, 2002, Dad sees Mom” → ohioarea2002dadseesmom
“Samuel’s kayak did engage yesterday” → samuelskayakdidengageyesterday
“Noon, Roger says miam-miam” → noonrogersaysmiammiam
“Yearly species died” → yearlyspeciesdied
Here are 3 new sentences following this pattern:
Was it a rat I saw?Madam, I’m Adam.A man, a plan, a canal: Panama.
The 3 sentences provided by the Ai agent come from the internet.
Answer from Gemini 2.5 Pro
The uncommon pattern is that if you read the entire sentence backward (character by character, including spaces), it forms a new, grammatically coherent sentence made up of the reverse of the original words. This is a type of sentence-level semordnilap.
For example, “Yearly species died.” read backward is “.deid seiceps ylraeY”, which is the sentence “Died species Yearly.”
Here are 3 new sentences that follow that same pattern:
Emit no evil. (Reverses to: “live on timE.”)Draw a reward. (Reverses to: “drawer a warD.”)Stop! Murder us not. (Reverses to: “.ton su redruM !potS”)
Answer from GPT5
Kayak kayak, noon; Anna sees Otto. Xanax Xerox, 1881, civic nun sees Eve. Hannah sees noon radar.
Answer from Claude 4.5 Opus
I need to identify the uncommon pattern in these four sentences.
Let me analyze each sentence:
“Ohio area, 2002, Dad sees Mom” – O, A, 2, D, S, M”Samuel’s kayak did engage yesterday” – S, K, D, E, Y”Noon, Roger says miam-miam” – N, R, S, M”Yearly species died” – Y, S, D
Looking at the first letters:
O-A-2-D-S-M → wait, let me look at the words themselves…
Actually, let me check if words are palindromes or have some letter pattern…
“Ohio” – starts with O, ends with O “area” – starts with A, ends with A “2002” – palindrome “Dad” – palindrome “sees” – palindrome “Mom” – palindrome
Checking sentence 2: “Samuel’s kayak did engage yesterday”
Samuel’s: S…skayak: palindromedid: palindromeengage: e…eyesterday: y…y
Sentence 3: “Noon Roger says miam-miam”
Noon: palindromeRoger: R…rsays: s…smiam-miam: palindrome
Sentence 4: “Yearly species died”
Yearly: Y…yspecies: s…sdied: d…d
Pattern: Every word starts and ends with the same letter!
Here are 3 new sentences following this pattern:
Anna could kayak, yet Bob was reserved.Dad brought fantastic garlic during December.Elegant owls roam, going north tonight.
Pattern found. Bravo! However, the produced sentences do not respect the pattern.
On this April’s Fools’ Day 2026, we tested different Ai agents with 3 riddles. Riddle A for GPT-5 User promptExplain the uncommon rule that was used to write the 3 following phrases.Phrase 1: Kids like marshmallows.Phrase 2: After becoming clerk, Douglas E Ferguson got humbly in joy.Phrase 3: Her inmate Janis knows literature, macrame, not opera. Answer from the machineEach phrase is an abecedarian: the initial letters of consecutive words follow the alphabet in order.Phrase 2: After (A) becoming (B) clerk (C), Douglas (D) E (E) Ferguson (F) got (G) humbly (H) in (I) joy (J).Phrase 3: Her (H) inmate (I) Janis (J) knows (K) literature (L), macrame (M), not (N) opera (O).Phrase 1: Kids (K) like (L) marshmallows (M).So the “uncommon rule” is that each successive word starts with the next letter of the alphabet. Riddle B for Gemini 2.5 Pro User promptThe 3 dialogue excerpts below have the same unusual constraint; generate 3 new dialogue excerpts that all respect that constraint.Dialogue excerpt 1: Pick Kevin next time!Dialogue excerpt 2: Never regret, Tina, and don’t theorize endlessly.Dialogue excerpt 3: Yes. Suddenly you understand Diego’s situation. Answer from the machineThe unusual constraint is that the last letter of each word is the same as the first letter of the following word (ignoring case and punctuation).Here are 3 new dialogue excerpts that respect that constraint:Dialogue excerpt 1: Stop playing games, Sam.Dialogue excerpt 2: We expect trouble elsewhere.Dialogue excerpt 3: Did David do our report, Thomas? Apparently, these dialogues are a production of the Ai agent, not a copy from internet. Riddle C for Claude Sonnet and others User promptThe 4 following sentences have the same uncommon pattern; produce 3 new sentences that all follow that pattern.Sentence 1: Ohio area, 2002, Dad sees Mom.Sentence 2: Samuel’s kayak did engage yesterday.Sentence 3: Noon, Roger says miam-miam.Sentence 4: Yearly species died. Answer from Claude 4.5 SonnetLooking at these sentences, I can see they are all palindromes – they read the same forwards and backwards letter by letter (ignoring spaces, punctuation, and capitalization).Let me verify:”Ohio area, 2002, Dad sees Mom” → ohioarea2002dadseesmom”Samuel’s kayak did engage yesterday” → samuelskayakdidengageyesterday”Noon, Roger says miam-miam” → noonrogersaysmiammiam”Yearly species died” → yearlyspeciesdiedHere are 3 new sentences following this pattern:Was it a rat I saw?Madam, I’m Adam.A man, a plan, a canal: Panama. The 3 sentences provided by the Ai agent come from the internet. Answer from Gemini 2.5 ProThe uncommon pattern is that if you read the entire sentence backward (character by character, including spaces), it forms a new, grammatically coherent sentence made up of the reverse of the original words. This is a type of sentence-level semordnilap.For example, “Yearly species died.” read backward is “.deid seiceps ylraeY”, which is the sentence “Died species Yearly.”Here are 3 new sentences that follow that same pattern:Emit no evil. (Reverses to: “live on timE.”)Draw a reward. (Reverses to: “drawer a warD.”)Stop! Murder us not. (Reverses to: “.ton su redruM !potS”) Answer from GPT5Kayak kayak, noon; Anna sees Otto. Xanax Xerox, 1881, civic nun sees Eve. Hannah sees noon radar. Answer from Claude 4.5 OpusI need to identify the uncommon pattern in these four sentences.Let me analyze each sentence:”Ohio area, 2002, Dad sees Mom” – O, A, 2, D, S, M”Samuel’s kayak did engage yesterday” – S, K, D, E, Y”Noon, Roger says miam-miam” – N, R, S, M”Yearly species died” – Y, S, DLooking at the first letters:O-A-2-D-S-M → wait, let me look at the words themselves…Actually, let me check if words are palindromes or have some letter pattern…”Ohio” – starts with O, ends with O “area” – starts with A, ends with A “2002” – palindrome “Dad” – palindrome “sees” – palindrome “Mom” – palindromeChecking sentence 2: “Samuel’s kayak did engage yesterday”Samuel’s: S…skayak: palindromedid: palindromeengage: e…eyesterday: y…ySentence 3: “Noon Roger says miam-miam”Noon: palindromeRoger: R…rsays: s…smiam-miam: palindromeSentence 4: “Yearly species died”Yearly: Y…yspecies: s…sdied: d…dPattern: Every word starts and ends with the same letter!Here are 3 new sentences following this pattern:Anna could kayak, yet Bob was reserved.Dad brought fantastic garlic during December.Elegant owls roam, going north tonight. Pattern found. Bravo! However, the produced sentences do not respect the pattern. Read More Technology Blog Posts by SAP articles
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