Run: 2026-09-29-01M3P2C8N9E9GH8Q4W5GJAM51P

Run Details

Duration:
17.6s
Cost:
$0.022454
Provider:
Claude Platform on AWS

Evaluation summary

Score Evaluator
Details Link
85.71% 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 hammered against the windows of Blackwood Manor as Detective Inspector Marlowe stepped inside, shaking water from his coat. A young constable met him in the marble hallway, pale and trembling, holding a notebook he had not yet opened. "Lord Ashcombe is dead, sir," the constable whispered, "found slumped over his desk in the locked library just after midnight." Marlowe followed him down the corridor, past portraits of stern ancestors whose painted eyes seemed to watch every hesitant step. Inside the library the fire still crackled, and the old man sat rigid in his chair, clutching a brass key. Marlowe knelt beside the body and noticed a smell of bitter almonds lingering around the empty glass on the desk. The door was locked from the inside, the windows were bolted, and yet somebody had clearly wanted Ashcombe silenced tonight. Somewhere close behind him, a floorboard creaked, and Marlowe realized that the killer might still be standing inside the house.
created_at"2026-09-29T07:51:57.362Z" 9/29/2026, 7:51:57 AM
model"anthropic/claude-sonnet-5.5-20260928"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency3682
moderation_latency(null)
generation_time17562
tokens_prompt46
tokens_completion501
native_tokens_prompt62
native_tokens_completion2233
native_tokens_completion_images(null)
native_tokens_reasoning1900
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"
usage0.022454
router(null)
user_agent"langchainjs-openai/1.0.0 ((node/v24.21.0; linux; x64))"
http_referer(null)
request_id"req-1790668317-owTU5i2LpEXo9C20vR4J"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1790668317-Levo1lUU2C9tNcfBROWO"
upstream_id"msg_011CfXNFiE3f5n9xYsf3heZS"
provider_responses
0
endpoint_id"99aaad94-923b-4fc1-b763-271ed5486f7a"
id"msg_011CfXNFiE3f5n9xYsf3heZS"
is_byokfalse
latency735
model_permaslug"anthropic/claude-sonnet-5.5-20260928"
provider_name"Claude Platform on AWS"
status200
total_cost0.022454
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
85.71% Matches word count n/a
neededCleanfalse
sentences7
wordCounts
020
120
240
320
420
520
620