Run: 2026-07-25-01KYCPQ9XYDDSSV7Q4KGC6W489

Run Details

Duration:
9.2s
Cost:
$0.008750
Provider:
Amazon Bedrock

Evaluation summary

Score Evaluator
Details Link
80.33% 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 it showed no intention whatsoever of stopping before dawn. Inspector Halloran stood beneath the dripping portico, watching the constable fumble with a lantern that refused to stay lit. "He's in the library, sir," the young man said, finally abandoning the lantern and gesturing toward the half-open oak door. Inside, the smell hit first: gun smoke, brandy, and something older, like coins left too long in a closed fist. Lord Bramwell Ashgrove lay across his writing desk, one hand extended toward a letter that had been torn precisely in half. Halloran counted seven people crowded into the doorway behind him, each wearing an expression carefully arranged into appropriate grief. The clock on the mantelpiece had stopped at eleven forty-three, though the inspector noticed its key lying three feet away. "Nobody leaves this house tonight," he said quietly, and watched to see which of the seven faces betrayed relief.
created_at"2026-07-25T13:16:37.187Z" 7/25/2026, 1:16:37 PM
model"anthropic/claude-opus-5-20260723"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency2144
moderation_latency115
generation_time8976
tokens_prompt46
tokens_completion251
native_tokens_prompt60
native_tokens_completion338
native_tokens_completion_images(null)
native_tokens_reasoning0
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"
usage0.00875
router(null)
provider_responses
0
endpoint_id"76cb4608-f48c-483d-8da8-9957fb44244e"
id"msg_011CdNqdEAcXhRTAg28vyBuV"
is_byokfalse
latency2144
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-1784985397-UKMmxqY6p0TBsPQgG02H"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1784985397-ERstsuXmcwetVozTuxFT"
upstream_id"msg_011CdNqdEAcXhRTAg28vyBuV"
total_cost0.00875
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
80.33% Matches word count n/a
neededCleanfalse
sentences8
wordCounts
020
119
220
320
421
519
620
719