Model

Claude Haiku 4.5

Test

N-Length Sentences

Scenario

Write sentences with 5 words each

Run ID

2026-02-08-01KGYXT5QHR0VNECRF7P63MJWJ

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 Midnight at Blackwood Manor The rain fell very hard. Detective Sarah entered the hall. A body lay quite still. Lord Blackwood was completely dead. His face showed pure terror. Blood pooled around his chair. The butler stood there shocked. Everyone gathered in the parlor. Nobody left the house tonight. The storm had locked doors. Sarah examined the victim closely. Poison seemed likely but strange. Three people had clear motives. The inheritance was worth millions. His wife looked very pale. His son appeared quite nervous. The business partner seemed worried. Sarah's eyes grew very sharp. A murder had just happened. Justice would soon be served.
created_at"2026-02-08T15:27:08.37337+00:00" Sunday, February 8th, 2026 at 3:27:08 PM GMT+00:00
model"anthropic/claude-4.5-haiku-20251001" 
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency696
moderation_latency250
generation_time2377
tokens_prompt35
tokens_completion132
native_tokens_prompt44
native_tokens_completion140
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" 
usage0.000744
router(null)
provider_responses
0
id"2d10511a-025f-4919-a8c5-4bb413a01141" 
status200
is_byokfalse
latency695
endpoint_id"d000261c-5aeb-47d1-ac87-ad64dbe1cdb6" 
provider_name"Amazon Bedrock" 
model_permaslug"anthropic/claude-4.5-haiku-20251001" 
api_type"completions" 
id"gen-1770564425-wSWrSiU1WsV6FktHNsUj" 
upstream_id"2d10511a-025f-4919-a8c5-4bb413a01141" 
total_cost0.000744
cache_discount(null)
upstream_inference_cost0
provider_name"Amazon Bedrock" 

Evaluation details

Result Evaluator Details Meta Data
98.9467% Matches word count n/a
neededCleanfalse
sentences21
wordCounts
06
15
25
35
45
55
65
75
85
95
105
115
125
135
145
155
165
175
185
195
205