Run: 2026-09-23-01M37Q01D81K86Q45NH1FCVVXM

Run Details

Duration:
20.8s
Cost:
$0.044928
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 rain had not stopped for three days when Inspector Clara Voss arrived at the iron gates of Ashworth Manor. A constable waited beneath a black umbrella, his face pale and his hands trembling as he opened the car door. "The body is in the library, ma'am," he said quietly, glancing back at the dark windows of the old house. Clara nodded once and followed him up the gravel path, her boots sinking slightly into the mud with every step. Inside, the grand hall smelled of candle wax and wet wool, and somewhere a clock ticked with patient, measured indifference. Five people stood waiting near the staircase, each of them wearing the careful expression of someone with something to hide. Lord Edmund Ashworth lay slumped in a leather armchair beside the fireplace, a crystal glass shattered on the rug below. His eyes were open, fixed upon the portrait of his wife, as though she were the last thing he saw. Clara crouched beside the chair and noticed a faint smell of bitter almonds rising from the stain on his lips. "Nobody leaves this house tonight," she said, standing slowly and turning to face the silent guests gathered in the doorway. Behind her, the clock struck midnight, and for a moment every person in the room seemed to stop breathing entirely.
created_at"2026-09-23T18:03:40.348Z" 9/23/2026, 6:03:40 PM
model"anthropic/claude-opus-5.5-20260921"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency20574
moderation_latency(null)
generation_time20574
tokens_prompt46
tokens_completion649
native_tokens_prompt62
native_tokens_completion2234
native_tokens_completion_images(null)
native_tokens_reasoning1814
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"
usage0.044928
router(null)
user_agent"langchainjs-openai/1.0.0 ((node/v24.20.0; linux; x64))"
http_referer(null)
request_id"req-1790186620-kyQJ8gisE1xGSlgBQJtc"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1790186620-cG73hJdwm2ZNrYfE9LiX"
upstream_id"msg_011CfLp3kNRr5dafWBPNTSC5"
provider_responses
0
endpoint_id"3a2388bc-3740-4e64-a1f5-4e301726b6b9"
id"msg_011CfLp3kNRr5dafWBPNTSC5"
is_byokfalse
latency1209
model_permaslug"anthropic/claude-opus-5.5-20260921"
provider_name"Claude Platform on AWS"
status200
total_cost0.044928
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
sentences11
wordCounts
020
120
220
320
420
520
620
720
820
920
1020