Run: 2026-10-08-01M4DAMVZWXP5VSDKVC5YHP63P

Run Details

Model:
Claude Haiku 5.5 (Reasoning, Medium)
Test:
N-Length Sentences
Scenario:
Write sentences with 5 words each
Duration:
6.4s
Cost:
$0.000428
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 manor windows. Detective Mara Holt arrived late. Lord Ashcombe lay face down. A silver letter opener protruded. Nobody had touched the body. Its crimson stain spread slowly. The butler wrung trembling hands. Three guests had gathered nearby. Each one avoided Mara's gaze. Someone in this house lied. She knelt beside the hearth. Ashes clung to the grate. Footprints led toward the library. The library door stood open.
created_at"2026-10-08T08:38:59.843Z" 10/8/2026, 8:38:59 AM
model"anthropic/claude-haiku-5.5-20261007"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency2343
moderation_latency(null)
generation_time6383
tokens_prompt46
tokens_completion196
native_tokens_prompt62
native_tokens_completion844
native_tokens_completion_images(null)
native_tokens_reasoning669
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"
usage0.0004282
router(null)
user_agent"langchainjs-openai/1.0.0 ((node/v24.21.0; linux; x64))"
http_referer(null)
request_id"req-1791448739-fSZry9BwNLSreMAoFnad"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1791448739-zVU38onlqa0yP0l0tuMB"
upstream_id"msg_011CfpU81QSmGo3C4pWKh1q1"
provider_responses
0
endpoint_id"b6cdf493-3a61-441f-a134-e7944fddb980"
id"msg_011CfpU81QSmGo3C4pWKh1q1"
is_byokfalse
latency720
model_permaslug"anthropic/claude-haiku-5.5-20261007"
provider_name"Claude Platform on AWS"
status200
total_cost0.0004282
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
sentences14
wordCounts
05
15
25
35
45
55
65
75
85
95
105
115
125
135