Run: 2026-05-29-01KSSKCNWTSG6YKTPC01FGBRNB

Run Details

Duration:
7.6s
Cost:
$0.009000
Provider:
Anthropic

Evaluation summary

Score Evaluator
Details Link
99.18% 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 window. Detective Marsh stepped inside slowly. The body lay completely still. Blood pooled across the floor. Nobody had touched the scene. A clock ticked somewhere nearby. The victim wore expensive clothes. His eyes stared at nothing. Marsh knelt beside the corpse. Something felt deeply wrong here. The door had been locked. No weapon could be found. Yet death had visited anyway. Marsh studied every tiny detail. This case would prove difficult. Outside, the storm grew louder. Lightning flashed across the room. Shadows danced along the walls. A single shoe sat overturned. Marsh frowned at the silence. Someone clearly wanted this man dead. He noticed faint muddy footprints. They led toward the kitchen. Marsh followed them very carefully. The trail simply vanished there. He pulled out his notebook. This mystery had only begun.
created_at"2026-05-29T10:10:01.763Z" 5/29/2026, 10:10:01 AM
model"anthropic/claude-4.8-opus-20260528"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency3203
moderation_latency(null)
generation_time7587
tokens_prompt46
tokens_completion254
native_tokens_prompt60
native_tokens_completion348
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"
usage0.009
router(null)
provider_responses
0
endpoint_id"b0d3beaa-5ff7-4666-a749-b1bb2b14c916"
id"msg_01WwPJf1CED4h4FQvZCoTjwj"
is_byokfalse
latency1447
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-1780049401-YY6HcUMkzbCuRCwAFSHw"
session_id(null)
api_type"completions"
id"gen-1780049401-GrAxuuB24QLFVustnzNW"
upstream_id"msg_01WwPJf1CED4h4FQvZCoTjwj"
total_cost0.009
cache_discount(null)
upstream_inference_cost0
provider_name"Anthropic"
response_cache_source_id(null)

Evaluation details

Result Evaluator Details Meta Data
99.18% Matches word count n/a
neededCleanfalse
sentences27
wordCounts
05
15
25
35
45
55
65
75
85
95
105
115
125
135
145
155
165
175
185
195
206
215
225
235
245
255
265