Run: 2026-07-25-01KYCPSCPQWWEC7AWXPJYYBP48

Run Details

Duration:
9.3s
Cost:
$0.009750
Provider:
Amazon Bedrock

Evaluation summary

Score Evaluator
Details Link
76.39% 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 arrived at midnight, hammering the slate roofs of Ashgrove like a thousand small fists demanding to be admitted. Inspector Nella Vance stood beneath the dripping archway of Thornfield House, counting the lit windows, and found one too many. The housekeeper who had telephoned her waited inside, wringing a dishcloth she had apparently forgotten she was still holding. "He's in the library," the woman said, and her voice cracked open on the word like ice beneath a boot heel. Nella wiped her boots on the mat, a courtesy the dead man would have appreciated, then walked down the corridor. Sir Edmund Hale sat in his leather chair with his back to the door, facing the tall black window. A chess board rested before him, the white king toppled, and a single glass of sherry stood untouched beside it. There was no blood, no wound, no disorder of any kind, only the stillness that comes after something ends. Nella crouched and studied the carpet, where damp footprints led from the window to the chair and then stopped. They did not lead back out again, which was, she thought, the first genuinely interesting fact of the night.
created_at"2026-07-25T13:17:45.565Z" 7/25/2026, 1:17:45 PM
model"anthropic/claude-opus-5-20260723"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency1750
moderation_latency(null)
generation_time9191
tokens_prompt46
tokens_completion291
native_tokens_prompt60
native_tokens_completion378
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"
usage0.00975
router(null)
provider_responses
0
endpoint_id"76cb4608-f48c-483d-8da8-9957fb44244e"
id"msg_011CdNqiFpivxnz6eDHQx4VM"
is_byokfalse
latency1750
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-1784985465-bGfrN1KurUA906JiZIDI"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1784985465-2hPM90dNgTubtypvwyXz"
upstream_id"msg_011CdNqiFpivxnz6eDHQx4VM"
total_cost0.00975
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
76.39% Matches word count n/a
neededCleanfalse
sentences10
wordCounts
020
120
219
321
420
519
620
719
819
919