Run: 2026-06-01-01KT1G66PAC1N7J6ZJ10BKYBVF

Run Details

Duration:
31.6s
Cost:
$0.085300
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 manor windows as Detective Sarah Cole stepped through the creaking wooden front door. Inside the dim and silent hallway, a single chandelier flickered above the lifeless body sprawled across the cold marble floor. The wealthy old patriarch Edmund Blackwood lay motionless, his eyes wide open, staring blankly toward the grand spiral staircase nearby. Detective Cole knelt down beside him, noting the shattered glass and the dark crimson stain spreading slowly beneath his head. Upstairs, the frightened family members whispered nervously among themselves, each hiding dark secrets they desperately hoped would never be revealed.
created_at"2026-06-01T11:47:59.311Z" 6/1/2026, 11:47:59 AM
model"anthropic/claude-4.8-opus-20260528"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency3695
moderation_latency(null)
generation_time31602
tokens_prompt46
tokens_completion445
native_tokens_prompt60
native_tokens_completion3400
native_tokens_completion_images(null)
native_tokens_reasoning271
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"
usage0.0853
router(null)
provider_responses
0
endpoint_id"b0d3beaa-5ff7-4666-a749-b1bb2b14c916"
id"msg_01RqUEmVYuHdDnRHzZiindL8"
is_byokfalse
latency1130
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-1780314479-mctPpmGN3iAZ56eScKss"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1780314479-QgPKMXXH2ODMegyFEH5u"
upstream_id"msg_01RqUEmVYuHdDnRHzZiindL8"
total_cost0.0853
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
sentences5
wordCounts
020
120
220
320
420