Run: 2026-09-23-01M37Q8FVSGWDN7TPPD9J7K4SK

Run Details

Duration:
16.9s
Cost:
$0.028048
Provider:
Claude Platform on AWS

Evaluation summary

Score Evaluator
Details Link
90.63% Matches word count (details)

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
Rain hammered the manor windows. Lightning split the black sky. Inside, the grandfather clock stopped. Nobody noticed it at first. Twelve guests sat for dinner. Only eleven plates were touched. Lord Ashworth's chair remained empty. His wife smiled too brightly. "He is merely running late." The butler refilled her glass. His gloved hands trembled slightly. Detective Mara Quinn watched everything. She had come uninvited, naturally. An anonymous letter summoned her. It contained only five words. "Someone dies before midnight tonight." The clock read eleven fifteen. Then a scream echoed upstairs. Chairs scraped against marble floors. Quinn reached the stairs first. The study door stood open. Ashworth lay beside the hearth. His eyes stared at nothing. A silver letter opener gleamed. It protruded from his chest. Quinn knelt and checked him. His skin was already cold. Too cold for fresh murder. She glanced at his wristwatch. Its shattered face read nine. Behind her, somebody gasped softly. Quinn rose and faced them. "Nobody leaves this house tonight." Thunder answered her like applause. Downstairs, the clock resumed ticking.
created_at"2026-09-23T18:08:17.29Z" 9/23/2026, 6:08:17 PM
model"anthropic/claude-opus-5.5-20260921"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency5528
moderation_latency(null)
generation_time16893
tokens_prompt46
tokens_completion465
native_tokens_prompt62
native_tokens_completion1390
native_tokens_completion_images(null)
native_tokens_reasoning976
native_tokens_cached0
num_media_prompt(null)
num_input_audio_prompt(null)
num_media_completion0
num_search_results(null)
num_fetches(null)
web_search_engine(null)
origin"https://ncbench.com/"
is_byokfalse
finish_reason"stop"
native_finish_reason"end_turn"
service_tier"default"
usage0.028048
router(null)
user_agent"langchainjs-openai/1.0.0 ((node/v24.20.0; linux; x64))"
http_referer(null)
request_id"req-1790186897-rWx3PZqmc7Qw7O33aYgt"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1790186897-pGorAg1dI6JMOyi10FKc"
upstream_id"msg_011CfLpQAK9VQCuDAmRoPg4Q"
provider_responses
0
endpoint_id"3a2388bc-3740-4e64-a1f5-4e301726b6b9"
id"msg_011CfLpQAK9VQCuDAmRoPg4Q"
is_byokfalse
latency1191
model_permaslug"anthropic/claude-opus-5.5-20260921"
provider_name"Claude Platform on AWS"
status200
total_cost0.028048
cache_discount(null)
upstream_inference_cost0
provider_name"Claude Platform on AWS"
response_cache_source_id(null)
data_region"global"
workspace_id"97e315e5-d303-487d-83c1-83180e8a13d4"

Evaluation details

Result Evaluator Details Meta Data
90.63% Matches word count n/a
neededCleanfalse
sentences32
wordCounts
05
15
25
35
45
55
65
75
810
95
105
115
125
135
1410
155
165
175
185
195
205
215
225
235
245
255
265
275
285
295
3010
315