Run: 2026-07-01-01KWE965A8H8HMMAY181WE41MF

Run Details

Model:
Claude Sonnet 5 (Reasoning, Low)
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
20.9s
Cost:
$0.023720
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 10 words. Please make sure that each sentence has the same length. Only return the opening itself.

Model response

AI
Cold rain hammered violently against the old mansion's windows tonight. Detective James Marlowe stood silently before the locked study door. Inside, a wealthy old man lay dead upon the floor. Dark blood pooled slowly beneath his still, cold body now. A silver letter opener glinted beside the victim's right hand. No obvious signs of forced entry marred this heavy door. Marlowe knelt down, examining the wound with practiced, careful eyes. Something about this whole crime scene felt deeply, terribly wrong.
created_at"2026-07-01T07:27:09.139Z" 7/1/2026, 7:27:09 AM
model"anthropic/claude-sonnet-5-20260630"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency4948
moderation_latency(null)
generation_time20899
tokens_prompt46
tokens_completion409
native_tokens_prompt60
native_tokens_completion2360
native_tokens_completion_images(null)
native_tokens_reasoning282
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"
usage0.02372
router(null)
provider_responses
0
endpoint_id"37b16f45-eeae-45f3-9b85-2137f7c6d61b"
id"msg_01YVhxS7HNAdfkUQvGDNQTfH"
is_byokfalse
latency1872
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-1782890829-v9Ai48knkWt5fy0G9LjZ"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1782890829-xYP3VHvxVREfdDTaOB3j"
upstream_id"msg_01YVhxS7HNAdfkUQvGDNQTfH"
total_cost0.02372
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
sentences8
wordCounts
010
110
210
310
410
510
610
710