Run: 2026-05-31-01KSYX8105JTR0777FFP1GTV71

Run Details

Duration:
13.4s
Cost:
$0.032175
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 10 words. Please make sure that each sentence has the same length. Only return the opening itself.

Model response

AI
The rain fell hard against the old mansion's tall windows. Detective Sarah Cole stepped slowly through the creaking front door. A single lamp flickered weakly in the cold dark hallway. The body lay motionless beneath the grand marble staircase below. Blood pooled silently across the polished floor near his hand. Sarah knelt down and studied the victim's pale frozen face. He had been wealthy, powerful, and feared by everyone here. Now he was simply another corpse demanding justice and answers. Footsteps echoed somewhere above her in the silent dark house. Someone else was still inside, watching, waiting, perhaps even hiding. Sarah rose quietly and reached for the gun she carried. Tonight would reveal secrets buried within these haunted ancient walls.
created_at"2026-05-31T11:38:27.405Z" 5/31/2026, 11:38:27 AM
model"anthropic/claude-4.8-opus-20260528"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency3185
moderation_latency(null)
generation_time13061
tokens_prompt46
tokens_completion299
native_tokens_prompt60
native_tokens_completion1275
native_tokens_completion_images(null)
native_tokens_reasoning109
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"
usage0.032175
router(null)
provider_responses
0
endpoint_id"b0d3beaa-5ff7-4666-a749-b1bb2b14c916"
id"msg_01MdfcPrhxFuBC7zBioTJFxB"
is_byokfalse
latency994
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-1780227507-1cIJEQUwm0tQmorjBVdb"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1780227507-f0DuftCBxPFfxXemzmNT"
upstream_id"msg_01MdfcPrhxFuBC7zBioTJFxB"
total_cost0.032175
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
sentences12
wordCounts
010
110
210
310
410
510
610
710
810
910
1010
1110