Run: 2026-07-01-01KWEA6SGVG5P9FW7BQ5QWVS4J

Run Details

Model:
Claude Sonnet 5 (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
40.6s
Cost:
$0.049640
Provider:
Amazon Bedrock

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 against the old manor's tall windows as Detective Sarah Voss slowly entered the darkened, silent foyer alone tonight. The body lay perfectly still and motionless beneath the grand staircase, blood pooling darkly across the cold marble floor below. Lord Harrington's lifeless eyes stared blankly upward, frozen in an expression of pure, unspeakable terror chilling everyone in the room. Detective Voss knelt beside the corpse, carefully noting the peculiar bruising around his throat and wrists with practiced, clinical precision. The butler, pale and trembling, silently hovered nervously near the doorway, unable to meet her steady, questioning gaze for long. Something terrible had happened here tonight, and Sarah knew the real mystery was only just truly beginning to unfold now.
created_at"2026-07-01T07:44:58.406Z" 7/1/2026, 7:44:58 AM
model"anthropic/claude-sonnet-5-20260630"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency5760
moderation_latency119
generation_time40467
tokens_prompt46
tokens_completion519
native_tokens_prompt60
native_tokens_completion4952
native_tokens_completion_images(null)
native_tokens_reasoning319
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"
usage0.04964
router(null)
provider_responses
0
endpoint_id"37b16f45-eeae-45f3-9b85-2137f7c6d61b"
id"msg_01GH9cvYvw45GkwTxBctiVSp"
is_byokfalse
latency2488
model_permaslug"anthropic/claude-sonnet-5-20260630"
provider_name"Amazon Bedrock"
status200
user_agent"langchainjs-openai/1.0.0 ((node/v24.17.0; linux; x64))"
http_referer(null)
request_id"req-1782891898-m2cnUYS1bTN9neBkiBcr"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1782891898-w3dR3c2BcAQ9VFEMGKXA"
upstream_id"msg_01GH9cvYvw45GkwTxBctiVSp"
total_cost0.04964
cache_discount(null)
upstream_inference_cost0
provider_name"Amazon Bedrock"
response_cache_source_id(null)
data_region"global"

Evaluation details

Result Evaluator Details Meta Data
100.00% Matches word count n/a
neededCleanfalse
sentences6
wordCounts
020
120
220
320
420
520