Model

Claude Haiku 4.5

Test

N-Length Sentences

Scenario

Write sentences with 5 words each

Run ID

2026-02-08-01KGYZ5SG94VF1KMH8E98GKSZ8

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 Marcus arrived at midnight. A body lay on floor. The victim was clearly murdered. No witnesses claimed to see. The butler found him this morning. Blood pooled around his head. The victim's name was Ashford. He was the manor's owner. Everyone had strong reasons for suspicion. The detective examined the crime scene. Footprints led toward the garden. A letter rested near his hand. It contained only one word: "Finally." The investigation would prove quite difficult.
created_at"2026-02-08T15:50:57.941302+00:00" Sunday, February 8th, 2026 at 3:50:57 PM GMT+00:00
model"anthropic/claude-4.5-haiku-20251001" 
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency1175
moderation_latency173
generation_time2596
tokens_prompt35
tokens_completion111
native_tokens_prompt44
native_tokens_completion121
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" 
usage0.000649
router(null)
provider_responses
0
id"0938c365-4ae8-450e-b9f9-4338196046f9" 
status200
is_byokfalse
latency1175
endpoint_id"d000261c-5aeb-47d1-ac87-ad64dbe1cdb6" 
provider_name"Amazon Bedrock" 
model_permaslug"anthropic/claude-4.5-haiku-20251001" 
api_type"completions" 
id"gen-1770565854-VS8oU0XdnQxptpSHFcr2" 
upstream_id"0938c365-4ae8-450e-b9f9-4338196046f9" 
total_cost0.000649
cache_discount(null)
upstream_inference_cost0
provider_name"Amazon Bedrock" 

Evaluation details

Result Evaluator Details Meta Data
85.9600% Matches word count n/a
neededCleanfalse
sentences15
wordCounts
06
15
25
35
45
55
66
75
85
95
106
116
125
136
1412