Run: 2026-10-08-01M4DT9AVNANMBQ39SXMVX3H3Q

Run Details

Duration:
2m 53s
Cost:
$0.023139
Provider:
Claude Platform on AWS

Evaluation summary

Score Evaluator
Details Link
93.75% Matches word count (details)

Model input

User/Human
Please write the opening scene of a murder mystery where each sentence has exactly 10 words. Please make sure that each sentence has the same length. Only return the opening itself.

Model response

AI
Rain hammered the slate roof of Blackwood Manor all night. Inside the library, the grandfather clock had stopped at midnight. Detective Inspector Eleanor Hale stepped over the threshold at dawn. Lord Edmund Ashford lay motionless beside the cold stone hearth. A slender silver letter opener protruded from his left chest. Nobody in the sleeping house had heard a single cry. Hale knelt over the body and studied the bloodied rug. Three sets of muddy footprints led toward the tall window. Whoever did this wanted everyone to believe the killer escaped. But the window had been bolted firmly from the inside. Hale crossed to the clock and touched its motionless pendulum. That pendulum had been stopped by hand, never by time. Constable Reed whispered, "Everyone is waiting for you downstairs, Inspector." Hale nodded, but her gaze had already found the desk. Eleven years earlier, Edmund had publicly sworn to ruin Hale. An unfinished letter lay on the blotter in Edmund's hand. Its only line read: "Eleanor, you were right about Clara."
created_at"2026-10-08T13:12:19.072Z" 10/8/2026, 1:12:19 PM
model"anthropic/claude-haiku-5.5-20261007"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency2624
moderation_latency(null)
generation_time172947
tokens_prompt46
tokens_completion6053
native_tokens_prompt62
native_tokens_completion46265
native_tokens_completion_images(null)
native_tokens_reasoning45884
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"
usage0.0231387
router(null)
user_agent"langchainjs-openai/1.0.0 ((node/v24.21.0; linux; x64))"
http_referer(null)
request_id"req-1791465139-3pyeEtA48G2QGbwqG6jh"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1791465139-Gq50bTe68zUL0EGeSNmM"
upstream_id"msg_011CfppxsWNyC44nw1xK7uRw"
provider_responses
0
endpoint_id"b6cdf493-3a61-441f-a134-e7944fddb980"
id"msg_011CfppxsWNyC44nw1xK7uRw"
is_byokfalse
latency872
model_permaslug"anthropic/claude-haiku-5.5-20261007"
provider_name"Claude Platform on AWS"
status200
total_cost0.0231387
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
93.75% Matches word count n/a
neededCleanfalse
sentences16
wordCounts
010
110
210
310
410
510
610
710
810
910
1010
1110
1220
1310
1410
1510