Run: 2026-09-23-01M37Q50G2M84AFC3C2PHG302R

Run Details

Duration:
20.1s
Cost:
$0.039248
Provider:
Claude Platform on AWS

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 fog rolled over Blackwood Manor like a gray shroud. Inspector Clara Hayes stepped from her car into the mud. A single candle burned in the highest window above her. The butler waited at the door, his face deathly pale. "Lord Ashford is in the library," he whispered to her. Clara followed him down a corridor lined with old portraits. Their painted eyes seemed to track every step she took. The library doors stood open, and cold air spilled out. Lord Ashford sat slumped in his chair by the fire. A silver letter opener was buried deep in his chest. Strangely, the fire was dead and the ashes stone cold. Clara knelt beside the body and noticed something even stranger. In his rigid fingers lay the torn queen of spades. Behind her, the butler spoke in a low, trembling voice. "That is the third card this month, Inspector," he said.
created_at"2026-09-23T18:06:23.254Z" 9/23/2026, 6:06:23 PM
model"anthropic/claude-opus-5.5-20260921"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency4700
moderation_latency(null)
generation_time20085
tokens_prompt46
tokens_completion590
native_tokens_prompt62
native_tokens_completion1950
native_tokens_completion_images(null)
native_tokens_reasoning1663
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"
usage0.039248
router(null)
user_agent"langchainjs-openai/1.0.0 ((node/v24.20.0; linux; x64))"
http_referer(null)
request_id"req-1790186783-M63jVxFZyIMhNX1u7HRu"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1790186783-M2Dy3yHysBoWPJs1rTE3"
upstream_id"msg_011CfLpFko4cvt8uNmL9W9Qf"
provider_responses
0
endpoint_id"3a2388bc-3740-4e64-a1f5-4e301726b6b9"
id"msg_011CfLpFko4cvt8uNmL9W9Qf"
is_byokfalse
latency1270
model_permaslug"anthropic/claude-opus-5.5-20260921"
provider_name"Claude Platform on AWS"
status200
total_cost0.039248
cache_discount(null)
upstream_inference_cost0
provider_name"Claude Platform on AWS"
response_cache_source_id(null)
data_region"global"
workspace_id"97e315e5-d303-487d-83c1-83180e8a13d4"

Evaluation details

Result Evaluator Details Meta Data
100.00% Matches word count n/a
neededCleanfalse
sentences15
wordCounts
010
110
210
310
410
510
610
710
810
910
1010
1110
1210
1310
1410