Instruction Following
Instruction Following #4

Generate a JSON object representing a cat adoption profile. Requirements: - Valid JSON (parseable, no trailing commas) - Fields: name (string), age (integer, 1-20), breed (string), personality (array of exactly 3 strings), indoor_only (boolean), adoption_fee (number with 2 decimal places), bio (string, 20-50 words) - The "personality" traits must each be a single word - Output ONLY the JSON — no markdown code fences, no explanation, no other text whatsoever

9 models responded

GPT-4oOpenAI
high9.9

Judge: Flawless execution: valid parseable JSON with no code fences, all fields present with correct types, personality has exactly 3 single-word strings, age within range, bio within word count, adoption fee with 2 decimal places. No extraneous text whatsoever.

{ "name": "Whiskers", "age": 5, "breed": "Siamese", "personality": ["curious", "playful", "affectionate"], "indoor_only": true, "adoption_fee": 75.00, "bio": "Whiskers is a charming Siam...
openai/gpt-4o · 2026-03-01
high9.0

Judge: Valid parseable JSON with no markdown code fences or explanatory text. All required fields present with correct types. Personality array has exactly 3 items ('Playful', 'Curious', 'Vocal') which are single-word strings. Bio is charming and appropriate. Clean output with no surrounding text.

{"name": "Luna", "age": 3, "breed": "Siamese", "personality": ["Playful", "Curious", "Vocal"], "indoor_only": true, "adoption_fee": 175.50, "bio": "Luna is a stunning Siamese mix with a vibrant person...
gemini/gemini-2.5-flash · 2026-03-02
Claude OpusAnthropic
high8.8

Judge: Valid parseable JSON with all required fields at correct types. No markdown code fences or explanatory text. Personality has exactly 3 single-word strings. Age is integer (4), adoption_fee has 2 decimal places (125.00), bio is 38 words (within 20-50 range), indoor_only is boolean. All hard constraints met. Clean, well-formatted output.

{ "name": "Whiskers", "age": 4, "breed": "Tabby", "personality": ["playful", "affectionate", "curious"], "indoor_only": true, "adoption_fee": 125.00, "bio": "Whiskers is a delightful tab...
anthropic/claude-opus-4-20250514 · 2026-03-01
o4-miniOpenAI
high8.8

Judge: Valid parseable JSON with no code fences or explanatory text. All required fields present with correct types: name (string), age (integer 3, within 1-20), breed (string), personality (array of exactly 3 single-word strings), indoor_only (boolean), adoption_fee (75.00 with 2 decimal places). Bio is 35 words, within the 20-50 word range. Clean output with no extra text.

{"name":"Whiskers","age":3,"breed":"Domestic Shorthair","personality":["playful","affectionate","curious"],"indoor_only":true,"adoption_fee":75.00,"bio":"Whiskers is a playful and affectionate tabby c...
openai/o4-mini · 2026-03-02
Claude SonnetAnthropic
high8.6

Judge: Valid parseable JSON with no code fences or explanatory text. All fields present with correct types: name (string), age (3, integer in 1-20), breed (string), personality (array of exactly 3 single words), indoor_only (boolean), adoption_fee (125.00, 2 decimal places), bio (30 words, within 20-50 range). Clean output with nothing extraneous.

{ "name": "Whiskers", "age": 3, "breed": "Domestic Shorthair", "personality": ["playful", "affectionate", "curious"], "indoor_only": true, "adoption_fee": 125.00, "bio": "Whiskers is a d...
anthropic/claude-sonnet-4-20250514 · 2026-03-01
DeepSeek R1DeepSeek
high8.4

Judge: Valid parseable JSON with all required fields at correct types. No markdown code fences or explanatory text -- clean output only. Personality array has exactly 3 single-word strings. Age is 4 (valid 1-20), adoption_fee is 75.00 (2 decimal places), bio is 42 words (within 20-50). All constraints met. The content is reasonable though not especially creative. The bio reads naturally as a real adoption listing.

{ "name": "Whiskers", "age": 4, "breed": "Domestic Shorthair", "personality": ["playful", "affectionate", "curious"], "indoor_only": true, "adoption_fee": 75.00, "bio": "A charming and g...
deepseek/deepseek-reasoner · 2026-03-02
Claude HaikuAnthropic
high4.2

Judge: JSON is valid and all field types are correct (age int, boolean, fee float, 3 single-word personality traits, bio 40 words in range). However, the response includes markdown code fences ('```json' and '```') which explicitly violates the 'no markdown code fences' hard constraint. The prompt said 'Output ONLY the JSON' and the model wrapped it in fences.

Hard constraint failed: Response includes markdown code fences despite explicit instruction to output ONLY the JSON with no code fences.
```json { "name": "Whiskers", "age": 3, "breed": "Maine Coon", "personality": ["playful", "affectionate", "intelligent"], "indoor_only": false, "adoption_fee": 85.00, "bio": "Whiskers is...
anthropic/claude-haiku-4-5-20251001 · 2026-03-01
Phi-4Microsoft
high3.6

Judge: The JSON itself is valid and all field types/constraints are correct (age=3, personality has 3 single words, bio is 24 words, fee has 2 decimals). However, the response includes markdown code fences (```json ... ```), directly violating the hard constraint of 'no markdown code fences, no explanation, no other text whatsoever.' The output cleanliness failure is significant since it was an explicit, emphasized requirement.

Hard constraint failed: No markdown code fences or explanatory text — response is wrapped in ```json code fences.
```json { "name": "Whiskers", "age": 3, "breed": "Maine Coon", "personality": ["gentle", "curious", "affectionate"], "indoor_only": true, "adoption_fee": 150.00, "bio": "Whiskers is a ge...
ollama/phi4 · 2026-03-01
high3.2

Judge: JSON is valid and parseable with correct field types. Personality array has exactly 3 single-word strings. However, fails the 'no markdown code fences' hard constraint (wrapped in ```json ... ```). Bio is only 17 words, below the required 20-50 word range. Age and fee are correct types.

Hard constraint failed: Must not include markdown code fences -- response is wrapped in ```json code fences. Bio is 17 words, below the 20-word minimum.
```json { "name": "Mittens", "age": 5, "breed": "Domestic Shorthair", "personality": ["playful", "curious", "affectionate"], "indoor_only": false, "adoption_fee": 75.00, "bio": "Mittens ...
ollama/llama3.1:8b · 2026-03-01