Model

Claude Haiku 4.5

Test

N-Length Sentences

Scenario

Write sentences with 5 words each

Run ID

2026-02-08-01KGZ09XTPCN36H3Q6ESPVFASM

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 rain fell quite hard. Detective Morgan arrived at midnight. A body lay there still. The victim was clearly dead. Nobody knew what had happened. The butler found her first. Her name was Catherine Wells. She wore an expensive dress. Blood stained the Persian rug. The library door was locked. Morgan examined the scene carefully. Three suspects remained in house. Each one had a motive. The clock showed half past. This would be very difficult.
created_at"2026-02-08T16:10:41.335913+00:00" Sunday, February 8th, 2026 at 4:10:41 PM GMT+00:00
model"anthropic/claude-4.5-haiku-20251001" 
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency401
moderation_latency(null)
generation_time1713
tokens_prompt35
tokens_completion98
native_tokens_prompt44
native_tokens_completion103
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" 
usage0.000559
router(null)
provider_responses
0
id"msg_01Uq94zkdu8bMP4sjuQidSRU" 
status200
is_byokfalse
latency401
endpoint_id"41d2915a-92e6-4993-b537-210b4e10cba8" 
provider_name"Anthropic" 
model_permaslug"anthropic/claude-4.5-haiku-20251001" 
api_type"completions" 
id"gen-1770567038-KheVO5oQ1Vdpt8tSLsbH" 
upstream_id"msg_01Uq94zkdu8bMP4sjuQidSRU" 
total_cost0.000559
cache_discount(null)
upstream_inference_cost0
provider_name"Anthropic" 

Evaluation details

Result Evaluator Details Meta Data
98.6175% Matches word count n/a
neededCleanfalse
sentences16
wordCounts
06
15
25
35
45
55
65
75
85
95
105
115
125
135
145
155