Model

Claude Haiku 4.5

Test

N-Length Sentences

Scenario

Write sentences with 10 words each

Run ID

2026-02-08-01KGYYTJQPJG0E7PNJ9YS17A26

Model input

User/Human
Please write the opening scene of a murder mystery where each sentence has exactly 10 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 grandfather clock struck midnight in the empty manor hall. Detective Sarah Chen arrived at the scene within the hour. Lord Ashford lay sprawled across the Persian rug, quite dead. His sterling silver letter opener protruded from between his ribs. No signs of forced entry were discovered anywhere in the house. The study door had been locked from the inside, naturally. His widow claimed she was asleep upstairs all evening. The butler reported hearing nothing unusual during the late night. Yet someone in this house had wanted him permanently gone. Detective Chen removed her notebook and began her careful investigation.
created_at"2026-02-08T15:44:50.397987+00:00" Sunday, February 8th, 2026 at 3:44:50 PM GMT+00:00
model"anthropic/claude-4.5-haiku-20251001" 
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency720
moderation_latency171
generation_time2235
tokens_prompt35
tokens_completion123
native_tokens_prompt44
native_tokens_completion131
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" 
usage0.000699
router(null)
provider_responses
0
id"984bf8ba-ab62-4031-8fa8-8c8240fe9be0" 
status200
is_byokfalse
latency720
endpoint_id"d000261c-5aeb-47d1-ac87-ad64dbe1cdb6" 
provider_name"Amazon Bedrock" 
model_permaslug"anthropic/claude-4.5-haiku-20251001" 
api_type"completions" 
id"gen-1770565487-oy04NtUA7DexjALRa8Hn" 
upstream_id"984bf8ba-ab62-4031-8fa8-8c8240fe9be0" 
total_cost0.000699
cache_discount(null)
upstream_inference_cost0
provider_name"Amazon Bedrock" 

Evaluation details

Result Evaluator Details Meta Data
86.2715% Matches word count n/a
neededCleanfalse
sentences11
wordCounts
06
110
210
310
410
511
610
79
810
910
1010