Run: 2026-10-08-01M4DADBXDBMRHHG4DF7CB0ESS

Run Details

Duration:
15.5s
Cost:
$0.001908
Provider:
Claude Platform on AWS

Evaluation summary

Score Evaluator
Details Link
100.00% Matches word count (details)

Model input

User/Human
Please write the opening scene of a murder mystery where each sentence has exactly 20 words. Please make sure that each sentence has the same length. Only return the opening itself.

Model response

AI
The rain had been falling steadily over Harrow Manor since midnight, turning every gravel path into dark, muddy, sluggish streams. Detective Inspector Eleanor Vance stood at the mansion's threshold, her collar turned up against the bitter wind off the moors. Behind her, the constable juggled a flashlight, a clipboard, and a paper cup of tea gone stone cold long ago. Inside, the dead man's study was unnaturally warm, lit by a single brass lamp that had burned all night long. Victor Ashworth lay slumped across his mahogany desk, one hand still clutching an empty crystal tumbler stained with amber whiskey. Eleanor crossed the Persian rug in silence, noting the overturned chair, the shattered decanter, and the open window swinging gently. Nothing in the room suggested a violent struggle, which troubled Eleanor far more than any spilled blood could possibly have. Somewhere above them, a heavy oak door creaked open, and footsteps descended the grand staircase with unhurried, almost theatrical certainty.
created_at"2026-10-08T08:34:54.005Z" 10/8/2026, 8:34:54 AM
model"anthropic/claude-haiku-5.5-20261007"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency15433
moderation_latency(null)
generation_time15433
tokens_prompt46
tokens_completion253
native_tokens_prompt62
native_tokens_completion3803
native_tokens_completion_images(null)
native_tokens_reasoning3448
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"
usage0.0019077
router(null)
user_agent"langchainjs-openai/1.0.0 ((node/v24.21.0; linux; x64))"
http_referer(null)
request_id"req-1791448494-sO4uWQ9D5POY65clL0OT"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1791448494-UQB3O4ca64TCS0zCo7ON"
upstream_id"msg_011CfpTotVE35EKTw7XD3RUD"
provider_responses
0
endpoint_id"b6cdf493-3a61-441f-a134-e7944fddb980"
id"msg_011CfpTotVE35EKTw7XD3RUD"
is_byokfalse
latency790
model_permaslug"anthropic/claude-haiku-5.5-20261007"
provider_name"Claude Platform on AWS"
status200
total_cost0.0019077
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
100.00% Matches word count n/a
neededCleanfalse
sentences8
wordCounts
020
120
220
320
420
520
620
720