Run: 2026-05-31-01KSYXS43W4RYSTSS84KPYEMS4

Run Details

Duration:
15.9s
Cost:
$0.035700
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 cold rain fell hard against the mansion's tall windows. Detective Sarah Cole stepped slowly through the heavy front door. A pale body lay sprawled across the cold marble floor. Blood pooled darkly beneath the victim's lifeless right pale hand. Sarah knelt down slowly and studied the strange wound carefully. The wealthy mansion's owner had been dead several long hours. Somewhere upstairs, a loose floorboard creaked beneath someone's quiet weight. Sarah froze still, her hand drifting toward the holstered weapon. The killer, it now seemed, had never actually left yet.
created_at"2026-05-31T11:47:47.466Z" 5/31/2026, 11:47:47 AM
model"anthropic/claude-4.8-opus-20260528"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency3908
moderation_latency(null)
generation_time15896
tokens_prompt46
tokens_completion301
native_tokens_prompt60
native_tokens_completion1416
native_tokens_completion_images(null)
native_tokens_reasoning157
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"
usage0.0357
router(null)
provider_responses
0
endpoint_id"b0d3beaa-5ff7-4666-a749-b1bb2b14c916"
id"msg_01HY6AYCrfCybaD2CsrodKUg"
is_byokfalse
latency1397
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-1780228067-nsCdVWJGW5lS8TLvBQdY"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1780228067-7xaDIlVjN28rnGbzAuav"
upstream_id"msg_01HY6AYCrfCybaD2CsrodKUg"
total_cost0.0357
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
sentences9
wordCounts
010
110
210
310
410
510
610
710
810