Model

Claude Haiku 4.5

Test

N-Length Sentences

Scenario

Write sentences with 5 words each

Run ID

2026-02-08-01KGZ0BV921XQ9E8CWQ1M9BTA5

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 Opening Detective Sarah arrives early. The mansion looms very dark. A body lies motionless inside. Lord Ashford has been murdered. His study door was locked. The butler found him this morning. Nobody heard a single scream. Three suspects remain in residence. Each one had clear motive. The clock stopped at midnight. Sarah examines the bloodstained letter. It reads, "You know why." Her pulse quickens with sudden dread. This case will demand everything. The game has just begun.
created_at"2026-02-08T16:11:44.734838+00:00" Sunday, February 8th, 2026 at 4:11:44 PM GMT+00:00
model"anthropic/claude-4.5-haiku-20251001" 
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency447
moderation_latency(null)
generation_time2187
tokens_prompt35
tokens_completion105
native_tokens_prompt44
native_tokens_completion112
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" 
usage0.000604
router(null)
provider_responses
0
id"msg_01WKx485nVrBPkJemzHJ7uKN" 
status200
is_byokfalse
latency447
endpoint_id"41d2915a-92e6-4993-b537-210b4e10cba8" 
provider_name"Anthropic" 
model_permaslug"anthropic/claude-4.5-haiku-20251001" 
api_type"completions" 
id"gen-1770567101-0kfv4RxUxFeV5j0xLShO" 
upstream_id"msg_01WKx485nVrBPkJemzHJ7uKN" 
total_cost0.000604
cache_discount(null)
upstream_inference_cost0
provider_name"Anthropic" 

Evaluation details

Result Evaluator Details Meta Data
83.8394% Matches word count n/a
neededCleanfalse
sentences15
wordCounts
03
14
25
35
45
55
66
75
85
95
105
115
1211
135
145