Run: 2026-10-09-01M4FXRJZV6S6CRJE28YMX0BPK

Run Details

Duration:
2.8s
Cost:
$0.000168
Provider:
Claude Platform on AWS

Evaluation summary

Score Evaluator
Details Link
81.55% 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
The rain fell hard on the silent old manor. Detective Helen Marsh stepped carefully through the muddy front gate. Officer Tom Briggs met her beneath the dripping stone archway. "The body was found in the library," he said quietly. Helen pulled on her gloves and followed him inside. Dusty portraits watched them from the cold, shadowed walls. A single lamp flickered weakly near the grand oak staircase. The victim lay sprawled across a faded Persian rug. Blood had pooled beneath his head in a dark circle. Helen knelt beside the body and studied the wound closely. "He was struck once, from behind, by someone standing close," she murmured. Briggs glanced nervously at the open window across the room. Someone had left in a hurry, and recently. On the desk lay a half-finished letter, its ink still wet. Helen lifted it carefully and began to read aloud. "If you are reading this, then I am already dead."
created_at"2026-10-09T08:51:33.505Z" 10/9/2026, 8:51:33 AM
model"anthropic/claude-haiku-5.5-20261007"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency2757
moderation_latency(null)
generation_time2757
tokens_prompt46
tokens_completion231
native_tokens_prompt62
native_tokens_completion324
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"
usage0.0001682
router(null)
user_agent"langchainjs-openai/1.0.0 ((node/v24.21.0; linux; x64))"
http_referer(null)
request_id"req-1791535893-XFHnXg1sb1k1jg65dd9R"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1791535893-bXbLdMn86cBTA6XyqlNs"
upstream_id"msg_011CfrNtUXPaBRczonQ2Ycns"
provider_responses
0
endpoint_id"b6cdf493-3a61-441f-a134-e7944fddb980"
id"msg_011CfrNtUXPaBRczonQ2Ycns"
is_byokfalse
latency698
model_permaslug"anthropic/claude-haiku-5.5-20261007"
provider_name"Claude Platform on AWS"
status200
total_cost0.0001682
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
81.55% Matches word count n/a
neededCleanfalse
sentences16
wordCounts
09
110
210
310
49
59
610
79
810
910
1012
1110
128
1311
149
1510