Run: 2026-06-01-01KT1J7BXWJG2HCVKNTW5Y7F11

Run Details

Duration:
36.3s
Cost:
$0.032300
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's tall windows. Detective Sarah Cole arrived just before the clock struck midnight. Inside, a single body lay sprawled across the cold floor. The victim was a wealthy banker named Charles Whitmore, fifty-three. Blood pooled slowly beneath his head, staining the wooden boards. Five guests remained trapped inside the house that stormy night. Each one harbored secrets they desperately wanted to keep hidden. Sarah studied the room carefully, noting every small detail present. A broken wine glass rested near the dead man's hand. Somewhere among these frightened faces hid a truly cold-blooded killer.
created_at"2026-06-01T12:23:34.592Z" 6/1/2026, 12:23:34 PM
model"anthropic/claude-4.8-opus-20260528"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency3878
moderation_latency(null)
generation_time36308
tokens_prompt46
tokens_completion325
native_tokens_prompt60
native_tokens_completion1280
native_tokens_completion_images(null)
native_tokens_reasoning164
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"
usage0.0323
router(null)
provider_responses
0
endpoint_id"b0d3beaa-5ff7-4666-a749-b1bb2b14c916"
id"msg_01JyRqnZL4Byk2XtT5mLAWqY"
is_byokfalse
latency946
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-1780316614-SmCJdv2y1T9MWNNyuyxd"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1780316614-IeTUWuiVqwv5gNuLwGIv"
upstream_id"msg_01JyRqnZL4Byk2XtT5mLAWqY"
total_cost0.0323
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