Run: 2026-02-08-01KGYYXCJJ3RP8AMZCVF7P3N62

Run Details

Duration:
3.3s
Cost:
$0.001179
Provider:
Anthropic

Evaluation summary

Score Evaluator
Details Link
71.45% Matches word count (details)

Model input

User/Human
Please write the opening scene of a murder mystery where each sentence has exactly 10 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 rain fell hard against the Victorian mansion's windows. Detective Sarah Chen stepped out of her unmarked sedan. The grand house loomed dark except for upstairs lights. A uniformed officer met her at the iron gates. "The victim is Margaret Ashford, age seventy-two," he said. Her body was discovered this morning by the maid. The scene is preserved upstairs in the east wing. Sarah climbed the spiral staircase with practiced, careful steps. The bedroom door stood open, revealing an unsettling, quiet scene. Margaret lay motionless upon her four-poster mahogany bed frame. Her silk nightgown was stained deep crimson with blood. An empty teacup sat on the nightstand beside her. The window behind her was open to the rain. Sarah's eyes narrowed as she surveyed the silent room. Something about this murder didn't feel quite right somehow. She turned to the officer waiting nervously in doorway. "Tell me everything you know about Margaret Ashford's life."
created_at"2026-02-08T15:46:23.534108+00:00" 2/8/2026, 3:46:23 PM
model"anthropic/claude-4.5-haiku-20251001"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency395
moderation_latency(null)
generation_time3154
tokens_prompt35
tokens_completion205
native_tokens_prompt44
native_tokens_completion227
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"
usage0.001179
router(null)
provider_responses
0
id"msg_01NPJLVEUJykecfkbxLgZvGb"
status200
is_byokfalse
latency395
endpoint_id"41d2915a-92e6-4993-b537-210b4e10cba8"
provider_name"Anthropic"
model_permaslug"anthropic/claude-4.5-haiku-20251001"
api_type"completions"
id"gen-1770565579-Bk4xmz9FpgTmo1CdjdNj"
upstream_id"msg_01NPJLVEUJykecfkbxLgZvGb"
total_cost0.001179
cache_discount(null)
upstream_inference_cost0
provider_name"Anthropic"

Evaluation details

Result Evaluator Details Meta Data
71.45% Matches word count n/a
neededCleanfalse
sentences18
wordCounts
06
19
29
39
49
59
69
79
89
910
109
119
129
139
149
159
169
179