Run: 2026-10-08-01M4DACJVVD3CC90Z9Q8A1203X

Run Details

Duration:
2.5s
Cost:
$0.000129
Provider:
Claude Platform on AWS

Evaluation summary

Score Evaluator
Details Link
37.35% 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 had not stopped for three days. Detective Mara Voss stepped carefully over the puddles. Yellow tape fluttered across the iron gate. Somewhere behind the mansion, a dog barked twice. She pulled her collar higher against the wind. Officer Dan Reyes met her at the door. His face looked pale beneath the porch light. "The body is upstairs, in the library," he said. Mara nodded and followed him up the creaking staircase. Every step echoed through the silent, empty house. At the top, a single lamp still burned. Its amber glow spilled across the blood-spattered carpet. Mara knelt beside the victim and studied her hands. Ink stained the fingertips of her right hand. Someone had been writing until the very end.
created_at"2026-10-08T08:34:28.354Z" 10/8/2026, 8:34:28 AM
model"anthropic/claude-haiku-5.5-20261007"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency736
moderation_latency(null)
generation_time2416
tokens_prompt46
tokens_completion180
native_tokens_prompt62
native_tokens_completion246
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"
usage0.0001292
router(null)
user_agent"langchainjs-openai/1.0.0 ((node/v24.21.0; linux; x64))"
http_referer(null)
request_id"req-1791448468-6vcGUr3R2WyX4AI1wJwn"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1791448468-71MFashxDZYUI5g7jqhs"
upstream_id"msg_011CfpTmzZHbzm4rLxjzi68s"
provider_responses
0
endpoint_id"b6cdf493-3a61-441f-a134-e7944fddb980"
id"msg_011CfpTmzZHbzm4rLxjzi68s"
is_byokfalse
latency736
model_permaslug"anthropic/claude-haiku-5.5-20261007"
provider_name"Claude Platform on AWS"
status200
total_cost0.0001292
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
37.35% Matches word count n/a
neededCleanfalse
sentences15
wordCounts
08
18
27
38
48
58
68
79
89
98
108
118
129
138
148