Run: 2026-09-23-01M37Q7D2DR4JXGX9STA45ZHRX

Run Details

Duration:
26.9s
Cost:
$0.051668
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 already knocked out the power when Margaret Hale found her husband lying dead beneath the library window. She stood in the doorway holding a trembling candle, watching wax drip slowly onto the old polished oak floorboards below. Edward was sprawled across the Persian rug, one arm outstretched toward the fireplace as if desperately reaching for something important. A stain spread from beneath his head, and beside him lay the brass poker that usually hung by the hearth. Thunder rolled over the moors, rattling the tall windows, and somewhere upstairs a door slammed shut with sudden, terrible violence. Margaret did not scream, because she knew eleven guests were sleeping under this roof tonight, and one was a killer. Instead, she knelt beside Edward and pried open his clenched fist, where she found a torn scrap of yellowed paper. Three words were written there in faded ink, and the handwriting belonged unmistakably to her beloved younger sister, Lydia Ashford. Lydia had drowned in the lake behind this very house exactly twelve years ago, on the night before Margaret's wedding. Holding the scrap closer to the flame, Margaret read the message twice, and her blood ran cold: I remember everything.
created_at"2026-09-23T18:07:41.659Z" 9/23/2026, 6:07:41 PM
model"anthropic/claude-opus-5.5-20260921"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency4216
moderation_latency(null)
generation_time26894
tokens_prompt46
tokens_completion707
native_tokens_prompt62
native_tokens_completion2571
native_tokens_completion_images(null)
native_tokens_reasoning2168
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"
usage0.051668
router(null)
user_agent"langchainjs-openai/1.0.0 ((node/v24.20.0; linux; x64))"
http_referer(null)
request_id"req-1790186861-AzNuxrZw15NAN90uDLFE"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1790186861-0afR2ApRX65kXGcaIOxA"
upstream_id"msg_011CfLpMY22tmQGyBvgFYX1x"
provider_responses
0
endpoint_id"3a2388bc-3740-4e64-a1f5-4e301726b6b9"
id"msg_011CfLpMY22tmQGyBvgFYX1x"
is_byokfalse
latency1276
model_permaslug"anthropic/claude-opus-5.5-20260921"
provider_name"Claude Platform on AWS"
status200
total_cost0.051668
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
sentences10
wordCounts
020
120
220
320
420
520
620
720
820
920