Run: 2026-05-29-01KSSJX9RMNDCVVQN3CFK971VA

Run Details

Duration:
6.6s
Cost:
$0.007575
Provider:
Anthropic

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 old windows. Detective Marsh stepped inside slowly. The mansion felt unusually cold. A body lay near stairs. Blood pooled across marble floors. Nobody had touched the scene. The victim wore expensive clothes. His eyes stared at nothing. Marsh knelt beside the corpse. Something glittered beneath the table. She reached for the object. It was a silver locket. Inside hung a faded photograph. The woman looked strangely familiar. Marsh frowned at the image. Someone screamed from upstairs suddenly. Footsteps thundered down the hall. A maid appeared, trembling violently. "He's dead," she whispered hoarsely. Marsh stood and turned around. The night had just begun.
created_at"2026-05-29T10:01:37.822Z" 5/29/2026, 10:01:37 AM
model"anthropic/claude-4.8-opus-20260528"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency3049
moderation_latency(null)
generation_time6599
tokens_prompt46
tokens_completion211
native_tokens_prompt60
native_tokens_completion291
native_tokens_completion_images(null)
native_tokens_reasoning40
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"
usage0.007575
router(null)
provider_responses
0
endpoint_id"b0d3beaa-5ff7-4666-a749-b1bb2b14c916"
id"msg_01US3Qgbwn5yFPZFwS9M9ecX"
is_byokfalse
latency1311
model_permaslug"anthropic/claude-4.8-opus-20260528"
provider_name"Anthropic"
status200
user_agent"langchainjs-openai/1.0.0 ((node/v24.16.0; linux; x64))"
http_referer(null)
request_id"req-1780048897-XJcnmXVn89vmfptanaDM"
session_id(null)
api_type"completions"
id"gen-1780048897-6HU577uwD25fwzBr66sB"
upstream_id"msg_01US3Qgbwn5yFPZFwS9M9ecX"
total_cost0.007575
cache_discount(null)
upstream_inference_cost0
provider_name"Anthropic"
response_cache_source_id(null)

Evaluation details

Result Evaluator Details Meta Data
100.00% Matches word count n/a
neededCleanfalse
sentences21
wordCounts
05
15
25
35
45
55
65
75
85
95
105
115
125
135
145
155
165
175
185
195
205