Run: 2026-09-29-01M3P2BVWWPKAV1N74VDSB644K

Run Details

Duration:
16.2s
Cost:
$0.020664
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
Rain hammered the windows of Blackwood Manor as Inspector Halloran stepped over the threshold and shook water from his coat. Somewhere upstairs, a clock struck midnight, and its final chime seemed to hang in the air like a held breath. Lady Verity Blackwood lay sprawled across the library floor, her pearl necklace scattered around her like tiny, lustrous, accusing eyes. Constable Pryce, pale and trembling, met him beside the body and whispered that all windows were bolted from the inside. Halloran knelt, studied the crimson stain blooming across her silk dress, and noticed no weapon lay anywhere in the room. Then he heard it: a faint, deliberate creak from the corridor, proving that someone in this house was still listening. Halloran smiled grimly, buttoned his coat, and resolved that before dawn, someone in Blackwood Manor would tell him the truth.
created_at"2026-09-29T07:51:44.289Z" 9/29/2026, 7:51:44 AM
model"anthropic/claude-sonnet-5.5-20260928"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency3829
moderation_latency(null)
generation_time16161
tokens_prompt46
tokens_completion527
native_tokens_prompt62
native_tokens_completion2054
native_tokens_completion_images(null)
native_tokens_reasoning1751
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"
usage0.020664
router(null)
user_agent"langchainjs-openai/1.0.0 ((node/v24.21.0; linux; x64))"
http_referer(null)
request_id"req-1790668304-BIVnPEy4k8f4qAB9wPEx"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1790668304-DVuHlqlg3hrWrQWeefR0"
upstream_id"msg_011CfXNEjwx1rPSvoiPeFUQ1"
provider_responses
0
endpoint_id"99aaad94-923b-4fc1-b763-271ed5486f7a"
id"msg_011CfXNEjwx1rPSvoiPeFUQ1"
is_byokfalse
latency632
model_permaslug"anthropic/claude-sonnet-5.5-20260928"
provider_name"Claude Platform on AWS"
status200
total_cost0.020664
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
sentences7
wordCounts
020
120
220
320
420
520
620