Run: 2026-09-29-01M3P2AQKKFFBMGCP6Z6H43M3T

Run Details

Model:
Claude Sonnet 5.5 (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
12.3s
Cost:
$0.012004
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 10 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 on the night. Inspector Hale shook water from his coat and stepped inside. The butler, pale and trembling, led him toward the library. Lord Ashcombe lay sprawled beside the hearth, eyes staring upward. A letter opener protruded from his chest like an accusation. Nobody heard a scream, a struggle, or even a whisper. Hale knelt and noticed the clock had stopped at midnight. Someone in this house had wanted the old man dead. Hale turned to the gathered guests and smiled without warmth. "Nobody leaves until I learn which of you is lying."
created_at"2026-09-29T07:51:07.13Z" 9/29/2026, 7:51:07 AM
model"anthropic/claude-sonnet-5.5-20260928"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency3813
moderation_latency(null)
generation_time12266
tokens_prompt46
tokens_completion432
native_tokens_prompt62
native_tokens_completion1188
native_tokens_completion_images(null)
native_tokens_reasoning977
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"
usage0.012004
router(null)
user_agent"langchainjs-openai/1.0.0 ((node/v24.21.0; linux; x64))"
http_referer(null)
request_id"req-1790668267-dDuFEAFIDAf9KPl4KWbP"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1790668267-JMDN2jdixR6TJRbn4jtm"
upstream_id"msg_011CfXNC1HMUdXGH76ckNPyd"
provider_responses
0
endpoint_id"99aaad94-923b-4fc1-b763-271ed5486f7a"
id"msg_011CfXNC1HMUdXGH76ckNPyd"
is_byokfalse
latency725
model_permaslug"anthropic/claude-sonnet-5.5-20260928"
provider_name"Claude Platform on AWS"
status200
total_cost0.012004
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
sentences10
wordCounts
010
110
210
310
410
510
610
710
810
910