Run: 2026-06-01-01KT1GNNNAJ101PD9E4PCD9Q3Q

Run Details

Duration:
26.2s
Cost:
$0.062975
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 violent storm raged outside the grand old mansion while Detective Sarah Cole studied the cold and lifeless body silently. Lord Edmund Ashford lay sprawled across the library carpet with a silver letter opener buried deep within his broad chest. His glassy eyes stared blankly toward the ceiling, frozen forever in an expression of utter shock and pure raw terror. Outside the heavy oak door, the remaining guests waited nervously, each one harboring secrets they desperately hoped remained forever hidden. Sarah knelt beside the corpse, noting the absence of any forced entry and the strange smile upon his pale lips. Whoever killed Lord Ashford tonight had been someone he trusted completely, someone who walked freely through these locked manor halls.
created_at"2026-06-01T11:56:26.158Z" 6/1/2026, 11:56:26 AM
model"anthropic/claude-4.8-opus-20260528"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency3755
moderation_latency(null)
generation_time26209
tokens_prompt46
tokens_completion355
native_tokens_prompt60
native_tokens_completion2507
native_tokens_completion_images(null)
native_tokens_reasoning165
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"
usage0.062975
router(null)
provider_responses
0
endpoint_id"b0d3beaa-5ff7-4666-a749-b1bb2b14c916"
id"msg_01U4zoyLaRDJTC1iA7a296z3"
is_byokfalse
latency1035
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-1780314986-BnPOXo6wx3OhYO459Wvb"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1780314986-PX4uRIYIk8u8qEWTvcB3"
upstream_id"msg_01U4zoyLaRDJTC1iA7a296z3"
total_cost0.062975
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