Run: 2026-10-08-01M4D9Y9C573KN7CP1952BHPFE

Run Details

Duration:
3.6s
Cost:
$0.000213
Provider:
Claude Platform on AWS

Evaluation summary

Score Evaluator
Details Link
74.87% 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
The rain had not stopped for three days straight now. Detective Sarah Hollis pulled her collar tight against the wind. Officers had cordoned off the old Brennan mansion overnight. Yellow tape snapped violently across the broken front gate. Nobody inside had answered the door since Tuesday. Her partner, Marcus Cole, met her beneath the dripping oak. "Body's in the study," he said, already walking ahead. She followed him up the cracked marble steps slowly. Inside, the air smelled of smoke and old lilies. A single lamp still burned on the mahogany desk. Beside it lay Victor Brennan, face down, motionless. An empty brandy glass rested near his outstretched hand. Sarah knelt carefully and studied the faint red stain. Something about the angle of the body felt wrong. Marcus crouched beside her, frowning at the shattered window. "Glass fell outward," he murmured, "so someone broke in." "Or someone wanted us to think exactly that," Sarah replied. She turned slowly, scanning the room for anything out of place. On the mantel, a clock had stopped at 11:42. Her heart quickened, because she had heard that exact time before.
created_at"2026-10-08T08:26:39.887Z" 10/8/2026, 8:26:39 AM
model"anthropic/claude-haiku-5.5-20261007"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency739
moderation_latency(null)
generation_time3543
tokens_prompt46
tokens_completion288
native_tokens_prompt62
native_tokens_completion413
native_tokens_completion_images(null)
native_tokens_reasoning0
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"
usage0.0002127
router(null)
user_agent"langchainjs-openai/1.0.0 ((node/v24.21.0; linux; x64))"
http_referer(null)
request_id"req-1791447999-k3PtRplFrXNFqLQ11Amp"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1791447999-A2xLuRPD6sAIEUq0SAbQ"
upstream_id"msg_011CfpTBTmBBp7x8d3hBwgX7"
provider_responses
0
endpoint_id"b6cdf493-3a61-441f-a134-e7944fddb980"
id"msg_011CfpTBTmBBp7x8d3hBwgX7"
is_byokfalse
latency739
model_permaslug"anthropic/claude-haiku-5.5-20261007"
provider_name"Claude Platform on AWS"
status200
total_cost0.0002127
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
74.87% Matches word count n/a
neededCleanfalse
sentences20
wordCounts
010
110
29
39
48
510
69
79
89
99
108
119
129
139
149
159
1610
1711
189
1911