Model

Claude Haiku 4.5

Test

N-Length Sentences

Scenario

Write sentences with 5 words each

Run ID

2026-02-08-01KGYWX9X8VTTZF0PNQT1R3DE4

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 Crimson Study Detective Sarah entered slowly. The room smelled like death. Blood pooled near the desk. A body lay there motionless. Her heart began to race. Something felt deeply wrong here. The victim was Lord Ashford. He'd been quite wealthy indeed. His eyes stared at nothing. Sarah pulled out her notebook. The butler stood in shock. "When did you find him?" she asked tersely. He trembled and started crying. "This morning, around half past." Sarah examined the study carefully. No signs of forced entry. The window remained locked tight. A whiskey glass sat empty. Poison seemed likely at first. But the wound told differently. A knife wound in back. Someone had known him well. The butler began to sweat. Sarah's eyes narrowed with suspicion. "Tell me everything you know."
created_at"2026-02-08T15:11:23.423267+00:00" Sunday, February 8th, 2026 at 3:11:23 PM GMT+00:00
model"anthropic/claude-4.5-haiku-20251001" 
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency1023
moderation_latency176
generation_time2895
tokens_prompt35
tokens_completion171
native_tokens_prompt44
native_tokens_completion183
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" 
usage0.000959
router(null)
provider_responses
0
id"e4da7b19-0e4f-4385-afcb-eae53df1123c" 
status200
is_byokfalse
latency1022
endpoint_id"d000261c-5aeb-47d1-ac87-ad64dbe1cdb6" 
provider_name"Amazon Bedrock" 
model_permaslug"anthropic/claude-4.5-haiku-20251001" 
api_type"completions" 
id"gen-1770563479-Of60Sz8wHaRxASZaXmmc" 
upstream_id"e4da7b19-0e4f-4385-afcb-eae53df1123c" 
total_cost0.000959
cache_discount(null)
upstream_inference_cost0
provider_name"Amazon Bedrock" 

Evaluation details

Result Evaluator Details Meta Data
90.2304% Matches word count n/a
neededCleanfalse
sentences25
wordCounts
04
14
25
35
45
55
65
75
85
95
105
115
128
135
1410
155
165
175
185
195
205
215
225
235
245