Run: 2026-05-29-01KSSJH7T7G7CAV2TQF935H2D6

Run Details

Duration:
29.2s
Cost:
$0.078800
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 20 words. Please make sure that each sentence has the same length. Only return the opening itself.

Model response

AI
The rain hammered against the old manor windows as Detective Sarah Cole stepped carefully across the cold marble entrance floor. A single body lay sprawled beneath the grand wooden staircase, surrounded by shattered glass and a widening pool of blood. The victim, wealthy industrialist Harold Vance, had hosted a lavish dinner party for twelve guests just three hours earlier tonight. Now each of them remained trapped inside, unaware that one among the small group had committed this brutal murder tonight. Sarah knelt beside the cold corpse, studying the strange wound while heavy rain drummed steadily on the roof above them. Outside, the storm raged even louder, sealing the manor completely, while inside, suspicion poisoned every whispered conversation between frightened guests.
created_at"2026-05-29T09:55:02.609Z" 5/29/2026, 9:55:02 AM
model"anthropic/claude-4.8-opus-20260528"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency3961
moderation_latency(null)
generation_time29082
tokens_prompt46
tokens_completion416
native_tokens_prompt60
native_tokens_completion3140
native_tokens_completion_images(null)
native_tokens_reasoning211
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"
usage0.0788
router(null)
provider_responses
0
endpoint_id"b0d3beaa-5ff7-4666-a749-b1bb2b14c916"
id"msg_01XqQsyuwCEqFdCHjiq4S7Jw"
is_byokfalse
latency1043
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-1780048502-GO9D8NxQWehHoWTIuN6o"
session_id(null)
api_type"completions"
id"gen-1780048502-YF0yeqv8fJsCH5hgi92f"
upstream_id"msg_01XqQsyuwCEqFdCHjiq4S7Jw"
total_cost0.0788
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
sentences6
wordCounts
020
120
220
320
420
520