Run: 2026-07-25-01KYCRARDAWFASY9K0TV38QPBS

Run Details

Duration:
31.0s
Cost:
$0.075025
Provider:
Amazon Bedrock

Evaluation summary

Score Evaluator
Details Link
88.89% 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 been falling on Ashgrove Manor since midnight, and by dawn the gravel drive resembled a shallow river. Inspector Marguerite Vance parked beside the stone fountain, killed the engine, and listened to rain drumming steadily on the roof. A constable waited under the portico, hunched inside a dripping cape, holding a black umbrella that had long since surrendered. "He's still inside the library, ma'am," the pale young constable said quietly, "and nobody has touched a single thing yet." Vance nodded, drew her coat tighter, and followed him through doors carved with grapevines into a vast cold marble hall. The house smelled of woodsmoke, lilies, and something faintly metallic that she recognized at once and chose not to mention. Sir Edmund Larkspur lay across the hearthrug, one arm outstretched, fingers still curled around the snapped stem of a wineglass. Blood had dried black in his silver hair, and beside him the fire had burned down to sullen orange embers. Six overnight guests sat in the drawing room across the corridor, drinking tea nobody wanted and saying nothing at all. One of them had killed him, and Vance intended to know which before the storm finally broke over the moor.
created_at"2026-07-25T13:44:43.186Z" 7/25/2026, 1:44:43 PM
model"anthropic/claude-opus-5-20260723"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency4409
moderation_latency(null)
generation_time30808
tokens_prompt46
tokens_completion632
native_tokens_prompt60
native_tokens_completion2989
native_tokens_completion_images(null)
native_tokens_reasoning330
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"
usage0.075025
router(null)
provider_responses
0
endpoint_id"76cb4608-f48c-483d-8da8-9957fb44244e"
id"msg_011CdNsmW825Vrkowwef4coZ"
is_byokfalse
latency1549
model_permaslug"anthropic/claude-opus-5-20260723"
provider_name"Amazon Bedrock"
status200
user_agent"langchainjs-openai/1.0.0 ((node/v24.18.0; linux; x64))"
http_referer(null)
request_id"req-1784987083-zDT5zom2jHKlmOz7CDqL"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1784987083-Wt0TxMjp1UP8r06LhP7k"
upstream_id"msg_011CdNsmW825Vrkowwef4coZ"
total_cost0.075025
cache_discount(null)
upstream_inference_cost0
provider_name"Amazon Bedrock"
response_cache_source_id(null)
data_region"global"

Evaluation details

Result Evaluator Details Meta Data
88.89% Matches word count n/a
neededCleanfalse
sentences9
wordCounts
020
120
220
340
420
520
620
720
820