Run: 2026-10-08-01M4DYD9XN66XK4KMHC9REY935

Run Details

Model:
Claude Haiku 5.5 (Reasoning, Low)
Test:
N-Length Sentences
Scenario:
Write sentences with 5 words each
Duration:
8.6s
Cost:
$0.000723
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 5 words. Please make sure that each sentence has the same length. Only return the opening itself.

Model response

AI
Rain hammered the Blackwood windows. Candles guttered in the draft. Mara Vance shook her coat. The butler avoided her gaze. Lord Ashcombe lay face down. A letter opener killed him. Nobody left the estate tonight. Someone in this house lied. Mara knelt beside the body. Ink stained his trembling fingers. The wedding ring was gone. Somewhere below, a door slammed. Mara turned toward the stairs.
created_at"2026-10-08T14:24:23.489Z" 10/8/2026, 2:24:23 PM
model"anthropic/claude-haiku-5.5-20261007"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency2220
moderation_latency(null)
generation_time8528
tokens_prompt46
tokens_completion322
native_tokens_prompt62
native_tokens_completion1434
native_tokens_completion_images(null)
native_tokens_reasoning1268
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"
usage0.0007232
router(null)
user_agent"langchainjs-openai/1.0.0 ((node/v24.21.0; linux; x64))"
http_referer(null)
request_id"req-1791469463-hjUOkf54zL23Xo5s7oay"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1791469463-SBe6BfiEu4aiIq1CwwLy"
upstream_id"msg_011CfpvTdwwvCovY7czT2dP1"
provider_responses
0
endpoint_id"b6cdf493-3a61-441f-a134-e7944fddb980"
id"msg_011CfpvTdwwvCovY7czT2dP1"
is_byokfalse
latency733
model_permaslug"anthropic/claude-haiku-5.5-20261007"
provider_name"Claude Platform on AWS"
status200
total_cost0.0007232
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
sentences13
wordCounts
05
15
25
35
45
55
65
75
85
95
105
115
125