Run: 2026-10-09-01M4FYFMTAKXCYWDVGKYWG81CC

Run Details

Model:
Claude Haiku 5.5 (Reasoning, Low)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
8.2s
Cost:
$0.000623
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
The rain had been falling over Blackmoor Manor since just before midnight, washing the gravel paths clean of every footprint. Inspector Eleanor Vance arrived at the estate just after seven, her coat soaked through and her temper already short tonight. The body of Lord Harrington lay face down beside the library's shattered window, one hand still gripping a letter opener. Nobody in the household admitted to hearing a scream, though every one of them had been wide awake and listening. Her gaze moved slowly across the room, settling at last on the muddy boot prints leading toward the locked study.
created_at"2026-10-09T09:04:09.04Z" 10/9/2026, 9:04:09 AM
model"anthropic/claude-haiku-5.5-20261007"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency3051
moderation_latency(null)
generation_time8160
tokens_prompt46
tokens_completion331
native_tokens_prompt62
native_tokens_completion1233
native_tokens_completion_images(null)
native_tokens_reasoning1044
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"
usage0.0006227
router(null)
user_agent"langchainjs-openai/1.0.0 ((node/v24.21.0; linux; x64))"
http_referer(null)
request_id"req-1791536649-MlKNd83bZX3cpsai26JP"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1791536649-XodQ7h6erzJZsWZpUibB"
upstream_id"msg_011CfrPrB3iu8HhbX3ueJGa7"
provider_responses
0
endpoint_id"b6cdf493-3a61-441f-a134-e7944fddb980"
id"msg_011CfrPrB3iu8HhbX3ueJGa7"
is_byokfalse
latency803
model_permaslug"anthropic/claude-haiku-5.5-20261007"
provider_name"Claude Platform on AWS"
status200
total_cost0.0006227
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
sentences5
wordCounts
020
120
220
320
420