Model

Claude Haiku 4.5

Test

N-Length Sentences

Scenario

Write sentences with 5 words each

Run ID

2026-02-08-01KGYYZNQDT6SDWT540T1NMJ16

Model input

User/Human
Please write the opening scene of a murder mystery where each sentence has exactly 5 words. Please make sure that each sentence has the same length. Only return the opening itself.

Model response

AI
# The Body in the Library The mansion stood quite dark. Rain fell against the windows. Margaret opened the heavy door. Inside, everything felt terribly wrong. She heard a distant scream. Her heart began beating faster. The library doors hung wide. Margaret stepped inside very slowly. There, beneath the grand piano, lay Thomas Ashford's lifeless body.
created_at"2026-02-08T15:47:37.740309+00:00" Sunday, February 8th, 2026 at 3:47:37 PM GMT+00:00
model"anthropic/claude-4.5-haiku-20251001" 
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency1250
moderation_latency167
generation_time2290
tokens_prompt35
tokens_completion72
native_tokens_prompt44
native_tokens_completion78
native_tokens_completion_images(null)
native_tokens_reasoning0
native_tokens_cached0
num_media_prompt(null)
num_input_audio_prompt(null)
num_media_completion0
num_search_results(null)
origin"https://ncbench.com/" 
is_byokfalse
finish_reason"stop" 
native_finish_reason"stop" 
usage0.000434
router(null)
provider_responses
0
id"55fa02fe-e51a-4468-85c8-519a7478d82e" 
status200
is_byokfalse
latency1250
endpoint_id"d000261c-5aeb-47d1-ac87-ad64dbe1cdb6" 
provider_name"Amazon Bedrock" 
model_permaslug"anthropic/claude-4.5-haiku-20251001" 
api_type"completions" 
id"gen-1770565654-V6lx4QpHJX60IjJ5sx3C" 
upstream_id"55fa02fe-e51a-4468-85c8-519a7478d82e" 
total_cost0.000434
cache_discount(null)
upstream_inference_cost0
provider_name"Amazon Bedrock" 

Evaluation details

Result Evaluator Details Meta Data
87.7880% Matches word count n/a
neededCleanfalse
sentences10
wordCounts
06
15
25
35
45
55
65
75
85
910