Run: 2026-05-29-01KSSK6V4YV5JN661HZJHHVMR0

Run Details

Duration:
21.2s
Cost:
$0.050500
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 hammered against the windows of old Blackwood manor. Detective Hartley arrived just before midnight, cold, soaked, and tired. The heavy front door stood wide open in the storm. Inside, a lifeless body lay sprawled across the cold floor. Lord Blackwood's lifeless eyes stared blankly toward the high ceiling. Blood pooled darkly beneath him, staining the expensive antique rug. Hartley knelt down slowly, examining the man's cold, pale face. Somewhere upstairs, a single floorboard creaked beneath a careful step. He froze, listening intently, hand reaching slowly toward his holster. The killer, he realized, had not yet left the house.
created_at"2026-05-29T10:06:50.538Z" 5/29/2026, 10:06:50 AM
model"anthropic/claude-4.8-opus-20260528"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency3973
moderation_latency(null)
generation_time21205
tokens_prompt46
tokens_completion360
native_tokens_prompt60
native_tokens_completion2008
native_tokens_completion_images(null)
native_tokens_reasoning183
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"
usage0.0505
router(null)
provider_responses
0
endpoint_id"b0d3beaa-5ff7-4666-a749-b1bb2b14c916"
id"msg_01LjLmcybAXXCRR6S4Ka2cB4"
is_byokfalse
latency1275
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-1780049210-G4CXnk6dha3sVJ0YBP7d"
session_id(null)
api_type"completions"
id"gen-1780049210-FC0XLx4e355ecGezHV2i"
upstream_id"msg_01LjLmcybAXXCRR6S4Ka2cB4"
total_cost0.0505
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
sentences10
wordCounts
010
110
210
310
410
510
610
710
810
910