Run: 2026-05-29-01KSSJEFWZKSD1KDGNRDBC3WP5

Run Details

Duration:
19.2s
Cost:
$0.048825
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 hammered against the old mansion windows as Detective Sarah Cole stepped carefully across the cold marble entrance hall. A single lifeless body lay sprawled beneath the grand staircase, surrounded by shattered glass and a spreading pool of blood. The victim, the wealthy banker Edmund Harlow, had clearly fallen from the upper landing during last night's lavish dinner party. Sarah crouched low, studying the angle of his broken neck and the strange bruises marking both of his pale wrists. Someone in this house had pushed him deliberately, and that someone was still hiding among the frightened, whispering overnight guests. Six guests waited nervously in the drawing room, each clutching secrets they desperately hoped the detective would never quite uncover. Sarah rose slowly, brushed off her coat, and turned toward them with a calm, knowing smile that promised relentless justice.
created_at"2026-05-29T09:53:32.801Z" 5/29/2026, 9:53:32 AM
model"anthropic/claude-4.8-opus-20260528"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency3361
moderation_latency(null)
generation_time18674
tokens_prompt46
tokens_completion385
native_tokens_prompt60
native_tokens_completion1941
native_tokens_completion_images(null)
native_tokens_reasoning161
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"
usage0.048825
router(null)
provider_responses
0
endpoint_id"b0d3beaa-5ff7-4666-a749-b1bb2b14c916"
is_byokfalse
latency231
model_permaslug"anthropic/claude-4.8-opus-20260528"
provider_name"Anthropic"
status429
1
endpoint_id"dfc0e5bd-d703-4fe2-a7bb-655eb95d5441"
id"msg_01Dck7QqgYJKr6aaUWY5hn29"
is_byokfalse
latency979
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-1780048412-Mf3QsheYBitdzWTOgt53"
session_id(null)
api_type"completions"
id"gen-1780048412-IsZ0dWLYCCaO9XGNCtll"
upstream_id"msg_01Dck7QqgYJKr6aaUWY5hn29"
total_cost0.048825
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
sentences7
wordCounts
020
120
220
320
420
520
620