Run: 2026-05-31-01KSYX93R8R8J19721FDVXFXVF

Run Details

Duration:
13.9s
Cost:
$0.033300
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 that cold night. Detective Hayes arrived just before the dawn broke over town. The body lay sprawled across the cold polished marble floor. Blood pooled darkly beneath the victim's lifeless and outstretched hand. Nobody in the silent house had heard a single sound. Hayes knelt down slowly and studied the pale frozen face. Someone had clearly wanted this wealthy man dead for certain. The only question now was who among them did it. Five frightened guests remained trapped inside the locked grand estate. Each one harbored dark secrets worth killing to keep hidden.
created_at"2026-05-31T11:39:02.806Z" 5/31/2026, 11:39:02 AM
model"anthropic/claude-4.8-opus-20260528"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency3666
moderation_latency(null)
generation_time13837
tokens_prompt46
tokens_completion297
native_tokens_prompt60
native_tokens_completion1320
native_tokens_completion_images(null)
native_tokens_reasoning136
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"
usage0.0333
router(null)
provider_responses
0
endpoint_id"b0d3beaa-5ff7-4666-a749-b1bb2b14c916"
id"msg_018uPTejaf37ARF1xrJLHaJS"
is_byokfalse
latency1120
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-1780227542-8OQnrCK62xrVRG2JtOaO"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1780227542-8jDcB1hgklnSM6K6Dcvn"
upstream_id"msg_018uPTejaf37ARF1xrJLHaJS"
total_cost0.0333
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