Run: 2026-09-29-01M3P2B3QRB2VPH02EK66G2ZCA

Run Details

Model:
Claude Sonnet 5.5 (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
19.8s
Cost:
$0.024904
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 that October night. Inside the library, twelve guests sipped sherry and pretended calm. Then the lights died, and somebody screamed from the corner. Candlelight revealed Lord Ashby slumped, a dagger in his back. Inspector Mara Quinn, a guest herself, studied each trembling face. "Nobody leaves until I learn who wielded that dagger tonight." Outside, the storm swallowed the road, and the killer smiled.
created_at"2026-09-29T07:51:19.552Z" 9/29/2026, 7:51:19 AM
model"anthropic/claude-sonnet-5.5-20260928"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency19749
moderation_latency(null)
generation_time19749
tokens_prompt46
tokens_completion468
native_tokens_prompt62
native_tokens_completion2478
native_tokens_completion_images(null)
native_tokens_reasoning2306
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"
usage0.024904
router(null)
user_agent"langchainjs-openai/1.0.0 ((node/v24.21.0; linux; x64))"
http_referer(null)
request_id"req-1790668279-YbiJXTLlGX9Wd8OEO7JU"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1790668279-TmCzjWImn3r6BDuTTXHV"
upstream_id"msg_011CfXNCvPT44LUBoRoSQkZi"
provider_responses
0
endpoint_id"99aaad94-923b-4fc1-b763-271ed5486f7a"
id"msg_011CfXNCvPT44LUBoRoSQkZi"
is_byokfalse
latency728
model_permaslug"anthropic/claude-sonnet-5.5-20260928"
provider_name"Claude Platform on AWS"
status200
total_cost0.024904
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
010
110
210
310
410
510
610