Run: 2026-09-23-01M37Q8NYB8WF4JW4NE7Y1XHJB

Run Details

Duration:
20.6s
Cost:
$0.040448
Provider:
Claude Platform on AWS

Evaluation summary

Score Evaluator
Details Link
100.00% Matches word count (details)

Model input

User/Human
Please write the opening scene of a murder mystery where each sentence has exactly 20 words. Please make sure that each sentence has the same length. Only return the opening itself.

Model response

AI
The storm had been raging for three days when Lady Margaret Ashworth was found dead in the old locked library. Inspector Thomas Reed stood in the doorway, rainwater dripping from his coat, and studied the scene with tired grey eyes. She lay slumped across the mahogany desk, one hand clutching a silver fountain pen, the other dangling toward the floor. The only key to the room had been discovered beneath her body, which made the whole situation considerably more troubling. Behind him, the butler cleared his throat nervously and announced that the other guests were waiting in the drawing room. Reed nodded slowly, knowing that one of those five elegant strangers had almost certainly committed this murder sometime last night. Before he joined them, he noticed something strange: the clock on the mantelpiece had stopped at eleven minutes past midnight. Somebody in this house was lying, and Reed intended to discover who before the storm cleared and they finally escaped.
created_at"2026-09-23T18:08:23.514Z" 9/23/2026, 6:08:23 PM
model"anthropic/claude-opus-5.5-20260921"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency5053
moderation_latency(null)
generation_time20513
tokens_prompt46
tokens_completion571
native_tokens_prompt62
native_tokens_completion2010
native_tokens_completion_images(null)
native_tokens_reasoning1700
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"
usage0.040448
router(null)
user_agent"langchainjs-openai/1.0.0 ((node/v24.20.0; linux; x64))"
http_referer(null)
request_id"req-1790186903-EdlZxsxsQLU1rMNcCbPy"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1790186903-RDQu2fpplul8jW563jVl"
upstream_id"msg_011CfLpQcpbD9xkHb6dCCRJ8"
provider_responses
0
endpoint_id"3a2388bc-3740-4e64-a1f5-4e301726b6b9"
id"msg_011CfLpQcpbD9xkHb6dCCRJ8"
is_byokfalse
latency1200
model_permaslug"anthropic/claude-opus-5.5-20260921"
provider_name"Claude Platform on AWS"
status200
total_cost0.040448
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
100.00% Matches word count n/a
neededCleanfalse
sentences8
wordCounts
020
120
220
320
420
520
620
720