Run: 2026-07-25-01KYCRN3WNENPE6PZJMGGZDNGW

Run Details

Duration:
39.4s
Cost:
$0.098300
Provider:
Amazon Bedrock

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 been falling on Ashcombe Hall since midnight, and by dawn the gravel drive resembled a shallow river. Mrs. Pemberton found the library door locked at seven, which had never once happened during her thirty years of service. She knocked twice, called the colonel's name, and pressed her ear against the cold oak until her patience finally failed. The spare key hung in the pantry, beneath a faded chart of tides nobody had consulted in nearly forty years. Her hands shook so badly that she dropped it twice before the lock surrendered with a small, reluctant metallic click. Colonel Ashcombe sat in his usual chair beside the fire, facing the window, his broad back turned toward the door. The fire had gone out hours ago, and the room held the stillness of a breath being held too long. One of his shoes lay overturned on the hearthrug, and his teacup lay shattered across the pale marble fender below. Mrs. Pemberton did not scream, because screaming had never once solved a single problem in the course of her life. Instead she noticed that the window latch stood open, though the colonel had feared draughts more than he feared death. She noticed too the wet footprints crossing the carpet, coming inward, and not one of them going back out again. Then she turned, very slowly, toward the tall bookcase where the shadows did not seem to be standing entirely still.
created_at"2026-07-25T13:50:22.621Z" 7/25/2026, 1:50:22 PM
model"anthropic/claude-opus-5-20260723"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency4381
moderation_latency(null)
generation_time39308
tokens_prompt46
tokens_completion928
native_tokens_prompt60
native_tokens_completion3920
native_tokens_completion_images(null)
native_tokens_reasoning583
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"
usage0.0983
router(null)
provider_responses
0
endpoint_id"76cb4608-f48c-483d-8da8-9957fb44244e"
id"msg_011CdNtCX6kc6G8aKLDvCX8A"
is_byokfalse
latency1647
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-1784987422-09lGoE7QtxRvEdNMg8aZ"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1784987422-B4NN9wk46tJZkRY4ZkBy"
upstream_id"msg_011CdNtCX6kc6G8aKLDvCX8A"
total_cost0.0983
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
100.00% Matches word count n/a
neededCleanfalse
sentences12
wordCounts
020
120
220
320
420
520
620
720
820
920
1020
1120