Run: 2026-10-09-01M4G1N9XX39325RFHZZR9K5SA

Run Details

Model:
Claude Haiku 5.5 (Reasoning, Low)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
8.0s
Cost:
$0.000644
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 Ashford Manor since midnight, washing the gravel paths clean of every single muddy footprint. Inspector Eleanor Vance arrived at half past seven, her umbrella dripping onto the cold marble foyer floor beneath the chandelier. Lord Harrington lay face down beside the library fireplace, one hand still clutching a crumpled letter sealed with black wax. Nobody in the household had heard a scream, which struck Vance as deeply, unsettlingly strange for such a quiet house.
created_at"2026-10-09T09:59:40.228Z" 10/9/2026, 9:59:40 AM
model"anthropic/claude-haiku-5.5-20261007"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency2405
moderation_latency(null)
generation_time8008
tokens_prompt46
tokens_completion288
native_tokens_prompt62
native_tokens_completion1275
native_tokens_completion_images(null)
native_tokens_reasoning1100
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"
usage0.0006437
router(null)
user_agent"langchainjs-openai/1.0.0 ((node/v24.21.0; linux; x64))"
http_referer(null)
request_id"req-1791539980-hqkoINZ4s9nxzBPudtk5"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1791539980-hlvBh6kmWbeee0wPMATg"
upstream_id"msg_011CfrU5j3eM9dZWFV2ftLnZ"
provider_responses
0
endpoint_id"b6cdf493-3a61-441f-a134-e7944fddb980"
id"msg_011CfrU5j3eM9dZWFV2ftLnZ"
is_byokfalse
latency840
model_permaslug"anthropic/claude-haiku-5.5-20261007"
provider_name"Claude Platform on AWS"
status200
total_cost0.0006437
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
sentences4
wordCounts
020
120
220
320