Run: 2026-06-01-01KT1G31H5WAC03BMYD3A6VMDX

Run Details

Duration:
37.1s
Cost:
$0.040700
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 fell hard against the old mansion windows tonight. Detective Harlow arrived just before midnight through the heavy fog. The front door stood wide open, swaying in the wind. Inside, the lifeless body lay sprawled across the marble floor. Blood pooled slowly beneath the wealthy old dead man's head. A single candle flickered weakly upon the small dusty table. Harlow knelt down slowly and studied the victim's pale face. Someone had clearly wanted this man dead for a reason. Footsteps echoed faintly from somewhere deep inside the dark house. He rose quietly and reached for his old loaded weapon.
created_at"2026-06-01T11:46:15.722Z" 6/1/2026, 11:46:15 AM
model"anthropic/claude-4.8-opus-20260528"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency3499
moderation_latency(null)
generation_time37035
tokens_prompt46
tokens_completion282
native_tokens_prompt60
native_tokens_completion1616
native_tokens_completion_images(null)
native_tokens_reasoning123
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"
usage0.0407
router(null)
provider_responses
0
endpoint_id"b0d3beaa-5ff7-4666-a749-b1bb2b14c916"
id"msg_0122Rv4FjEmvV84SLBupUpsj"
is_byokfalse
latency920
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-1780314375-ftVKAGDi1TuhiDu59b86"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1780314375-hoAJA9BCNHIPkaVOTJA8"
upstream_id"msg_0122Rv4FjEmvV84SLBupUpsj"
total_cost0.0407
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