Run: 2026-10-08-01M4DAF761MNSXD1S8EV5RKGSG

Run Details

Duration:
2.6s
Cost:
$0.000115
Provider:
Claude Platform on AWS

Evaluation summary

Score Evaluator
Details Link
53.81% 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 against the manor windows tonight. Detective Mara Ellison stepped carefully across the wet gravel. Lanterns swayed above the gate, casting long, trembling shadows. Inside, the housekeeper wept quietly beside the staircase. Nobody had touched the body in the library. Mara knelt beside the victim and studied his hands. A single silver key lay beneath his fingers. Someone had wanted this death to look accidental. She noticed the muddy footprints leading toward the study. Each print pointed toward the grandfather clock. Mara turned slowly, meeting the stares of six suspects. Every one of them had a reason to lie.
created_at"2026-10-08T08:35:54.696Z" 10/8/2026, 8:35:54 AM
model"anthropic/claude-haiku-5.5-20261007"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency753
moderation_latency(null)
generation_time2541
tokens_prompt46
tokens_completion159
native_tokens_prompt62
native_tokens_completion218
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"
usage0.0001152
router(null)
user_agent"langchainjs-openai/1.0.0 ((node/v24.21.0; linux; x64))"
http_referer(null)
request_id"req-1791448554-WlFoNcNvzqcaWN7fv4h0"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1791448554-qqMJCp85PSwrF8OQXl7K"
upstream_id"msg_011CfpTtMptLqFfYyhYu5Euu"
provider_responses
0
endpoint_id"b6cdf493-3a61-441f-a134-e7944fddb980"
id"msg_011CfpTtMptLqFfYyhYu5Euu"
is_byokfalse
latency753
model_permaslug"anthropic/claude-haiku-5.5-20261007"
provider_name"Claude Platform on AWS"
status200
total_cost0.0001152
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
53.81% Matches word count n/a
neededCleanfalse
sentences12
wordCounts
09
19
29
38
48
59
68
78
89
97
109
119