Run: 2026-06-01-01KT1J3BE30PRQR9G0DMWFD84R

Run Details

Duration:
35.4s
Cost:
$0.027275
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
Rain hammered the old mansion windows throughout the stormy night. Detective Sarah Cole arrived just after the clock struck midnight. The butler opened the heavy door with trembling pale hands. Inside, a single body lay sprawled across the cold floor. Lord Pemberton, wealthy and feared, would never speak again now. Five guests gathered nervously inside the dimly lit grand parlor. Each one harbored secrets worth killing for, Sarah quietly suspected. She studied every anxious face searching for hidden silent guilt. Outside, the storm raged louder, trapping everyone within these walls. Tonight, someone among them was a cold, calculating, ruthless killer.
created_at"2026-06-01T12:21:23.02Z" 6/1/2026, 12:21:23 PM
model"anthropic/claude-4.8-opus-20260528"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency3484
moderation_latency(null)
generation_time35404
tokens_prompt46
tokens_completion267
native_tokens_prompt60
native_tokens_completion1079
native_tokens_completion_images(null)
native_tokens_reasoning102
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"
usage0.027275
router(null)
provider_responses
0
endpoint_id"b0d3beaa-5ff7-4666-a749-b1bb2b14c916"
id"msg_01BfxWM21tZ6ERYNrGEEottx"
is_byokfalse
latency929
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-1780316483-pVXga5afDv3axgrlOTeE"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1780316483-3q6Oar6tFJPUwEewWcBI"
upstream_id"msg_01BfxWM21tZ6ERYNrGEEottx"
total_cost0.027275
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