Run: 2026-10-09-01M4G0KBC06F80DES9CC7AH1DB

Run Details

Duration:
3.2s
Cost:
$0.000216
Provider:
Claude Platform on AWS

Evaluation summary

Score Evaluator
Details Link
60.38% 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 Ashford Manor tonight. Detective Miles Corrigan stepped out of his battered sedan. Thunder rolled across the moors like distant cannon fire. Inside the foyer, a single lamp flickered weakly above the staircase. Lady Evelyn Thorne lay motionless at the bottom of the steps. Her silver necklace glinted against the dark marble floor. Corrigan knelt beside her and checked for a pulse. His fingers found nothing but cold, unmoving skin. Behind him, the butler cleared his throat nervously. "Nobody has touched anything, Detective," he whispered softly. Corrigan noticed a teacup shattered near the doorway. Its amber liquid had spread into a dark, sticky stain. Upstairs, a door creaked open slowly and deliberately. Someone was watching them from the shadows above. Corrigan rose slowly and pulled out his notebook. "Everyone stays in the drawing room until morning," he announced. The butler nodded, but his hands were trembling badly. Corrigan made a mental note of that small detail. Outside, the storm grew louder against the tall windows. And somewhere in the house, a clock began to chime.
created_at"2026-10-09T09:41:07.592Z" 10/9/2026, 9:41:07 AM
model"anthropic/claude-haiku-5.5-20261007"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency746
moderation_latency(null)
generation_time3204
tokens_prompt46
tokens_completion284
native_tokens_prompt62
native_tokens_completion420
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"
usage0.0002162
router(null)
user_agent"langchainjs-openai/1.0.0 ((node/v24.21.0; linux; x64))"
http_referer(null)
request_id"req-1791538867-FuMBZqMpilj8fN2q3u4D"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1791538867-027DiB5s5z4WfhgTRVti"
upstream_id"msg_011CfrSfhxNqMcZj1SfxdC9H"
provider_responses
0
endpoint_id"b6cdf493-3a61-441f-a134-e7944fddb980"
id"msg_011CfrSfhxNqMcZj1SfxdC9H"
is_byokfalse
latency746
model_permaslug"anthropic/claude-haiku-5.5-20261007"
provider_name"Claude Platform on AWS"
status200
total_cost0.0002162
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
60.38% Matches word count n/a
neededCleanfalse
sentences20
wordCounts
08
19
29
311
411
59
69
78
88
98
108
1110
128
138
148
1510
169
179
189
1910