Model

Claude Haiku 4.5

Test

N-Length Sentences

Scenario

Write sentences with 5 words each

Run ID

2026-02-08-01KGZ0081NM8J67EB5GHBSSCJ1

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 mansion loomed quite dark. Rain pelted the tall windows. Detective Hayes arrived very late. A body lay on floor. The victim was extremely dead. Everyone gathered in the hall. Suspicion filled each nervous face. Someone here had killed him. The detective began asking questions. Who had seen him last?
created_at"2026-02-08T16:05:26.350809+00:00" Sunday, February 8th, 2026 at 4:05:26 PM GMT+00:00
model"anthropic/claude-4.5-haiku-20251001" 
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency2757
moderation_latency(null)
generation_time3914
tokens_prompt35
tokens_completion71
native_tokens_prompt44
native_tokens_completion74
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" 
usage0.000414
router(null)
provider_responses
0
id"msg_01QA7x6cSmPvWS2PNNKuknrV" 
status200
is_byokfalse
latency2757
endpoint_id"41d2915a-92e6-4993-b537-210b4e10cba8" 
provider_name"Anthropic" 
model_permaslug"anthropic/claude-4.5-haiku-20251001" 
api_type"completions" 
id"gen-1770566721-cw5Fi6clT1bsLjrHgm6l" 
upstream_id"msg_01QA7x6cSmPvWS2PNNKuknrV" 
total_cost0.000414
cache_discount(null)
upstream_inference_cost0
provider_name"Anthropic" 

Evaluation details

Result Evaluator Details Meta Data
97.9891% Matches word count n/a
neededCleanfalse
sentences11
wordCounts
06
15
25
35
45
55
65
75
85
95
105