Run: 2026-05-31-01KSYXAS8MBZNQ5DE9TYTS14CT

Run Details

Duration:
18.1s
Cost:
$0.045150
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 fell heavily against the old mansion windows as Detective Sarah Cole stepped slowly across the creaking wooden floor. A single lamp flickered weakly in the corner, casting long shadows that danced upon the blood-stained old Persian rug below. The body of the wealthy patriarch Edmund Blackwood lay sprawled near the cold fireplace, his glassy eyes staring upward forever. Outside, the thunder rumbled ominously while inside the gathered family members whispered nervously about who had committed this terrible deed. Sarah knelt beside the victim, noting the strange silver dagger embedded deeply within his chest, glinting in the dim light. She glanced upward toward the grand staircase where five suspects stood frozen, each harboring secrets that could prove utterly deadly.
created_at"2026-05-31T11:39:57.601Z" 5/31/2026, 11:39:57 AM
model"anthropic/claude-4.8-opus-20260528"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency3247
moderation_latency147
generation_time17929
tokens_prompt46
tokens_completion302
native_tokens_prompt60
native_tokens_completion1794
native_tokens_completion_images(null)
native_tokens_reasoning105
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"
usage0.04515
router(null)
provider_responses
0
endpoint_id"b0d3beaa-5ff7-4666-a749-b1bb2b14c916"
id"msg_01XgpV3h5aixf1GzuJfvQR2j"
is_byokfalse
latency1205
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-1780227597-Cl6wlFQHnB3qb6asl6yG"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1780227597-OGB6QyInB01ruPGg40WF"
upstream_id"msg_01XgpV3h5aixf1GzuJfvQR2j"
total_cost0.04515
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