Model

Claude Haiku 4.5

Test

N-Length Sentences

Scenario

Write sentences with 5 words each

Run ID

2026-02-08-01KGYX5G39E05SP4H61ECKCNP7

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 Blackthorn Manor Detective Sarah entered slowly today. The mansion felt cold somehow. Lord Ashford lay quite dead. A knife pierced his chest. Nobody heard him scream tonight. The butler stood very still. His hands trembled with fear. Sarah examined the body carefully. Blood pooled upon marble floors. The clock showed midnight exactly. Someone wanted him dead badly. The drawing room smelled strange. An empty glass sat nearby. Poison mixed with expensive wine. This case would prove difficult.
created_at"2026-02-08T15:15:50.393079+00:00" Sunday, February 8th, 2026 at 3:15:50 PM GMT+00:00
model"anthropic/claude-4.5-haiku-20251001" 
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency618
moderation_latency(null)
generation_time2041
tokens_prompt35
tokens_completion103
native_tokens_prompt44
native_tokens_completion126
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" 
usage0.000674
router(null)
provider_responses
0
id"msg_01L4k75Toghs8EBjcFBhmCrE" 
status200
is_byokfalse
latency601
endpoint_id"41d2915a-92e6-4993-b537-210b4e10cba8" 
provider_name"Anthropic" 
model_permaslug"anthropic/claude-4.5-haiku-20251001" 
api_type"completions" 
id"gen-1770563747-ElET71lK08GwI8rcSWPu" 
upstream_id"msg_01L4k75Toghs8EBjcFBhmCrE" 
total_cost0.000674
cache_discount(null)
upstream_inference_cost0
provider_name"Anthropic" 

Evaluation details

Result Evaluator Details Meta Data
98.6175% Matches word count n/a
neededCleanfalse
sentences16
wordCounts
06
15
25
35
45
55
65
75
85
95
105
115
125
135
145
155