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Run: 2026-07-25-01KYCQYV9RN812VSQFGPR04RPK
Run Details
Model:
Claude Opus 5 (Reasoning, Low)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
36.8s
Cost:
$0.088525
Provider:
Amazon Bedrock
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
Messages
Meta
AI
The rain had been falling on Ashcombe Manor since midnight, and by dawn the gravel drive resembled a shallow river. Inspector Nell Ravensworth arrived at seven, her thin coat soaked through completely, carrying nothing but a notebook and considerable suspicion. The butler met her beneath the portico, his face the colour of the grey ash in yesterday's cold, unswept grate. He said the library door was locked from inside, and Sir Edmund Wren had not answered any of their knocking. Nell followed him through corridors smelling of beeswax and old money, past ancestors who watched her pass with painted disapproval. Three sleepless guests waited in the hall, arranged like witnesses at a private trial that had not yet formally begun. Nobody offered a greeting, which told her more about the household than an entire hour of careful, polite questioning would. The library door yielded on the third shoulder, splintering at the lock and swinging slowly inward against a waiting silence. Sir Edmund sat at his desk with a letter opener between his ribs and a faint expression of mild surprise. The windows were latched, the chimney was blocked, and the only key lay inside the dead man's own waistcoat pocket. Nell crouched beside the body, studying the wound, and noticed the ink still wet on his stiff left shirt cuff. Somebody inside this locked house had written something, and someone else had made certain that nobody would ever read it.
created_at
"2026-07-25T13:38:12.932Z"
7/25/2026, 1:38:12 PM
model
"anthropic/claude-opus-5-20260723"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
4340
moderation_latency
148
generation_time
36373
tokens_prompt
46
tokens_completion
771
native_tokens_prompt
60
native_tokens_completion
3529
native_tokens_completion_images
(null)
native_tokens_reasoning
410
native_tokens_cached
0
num_media_prompt
(null)
num_input_audio_prompt
(null)
num_media_completion
0
num_search_results
(null)
num_fetches
(null)
web_search_engine
(null)
origin
"https://ncbench.com/"
is_byok
false
finish_reason
"stop"
native_finish_reason
"end_turn"
service_tier
"default"
usage
0.088525
router
(null)
provider_responses
0
endpoint_id
"76cb4608-f48c-483d-8da8-9957fb44244e"
id
"msg_011CdNsGkRRvvLvPXiaG9EWB"
is_byok
false
latency
1538
model_permaslug
"anthropic/claude-opus-5-20260723"
provider_name
"Amazon Bedrock"
status
200
user_agent
"langchainjs-openai/1.0.0 ((node/v24.18.0; linux; x64))"
http_referer
(null)
request_id
"req-1784986692-kz14SuIFZsqBodmpxPXm"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1784986692-9SDZnyTqBF1Wj9XDmCYG"
upstream_id
"msg_011CdNsGkRRvvLvPXiaG9EWB"
total_cost
0.088525
cache_discount
(null)
upstream_inference_cost
0
provider_name
"Amazon Bedrock"
response_cache_source_id
(null)
data_region
"global"
Evaluation details
Result
Evaluator
Details
Meta Data
100.00%
Matches word count
n/a
neededClean
false
sentences
12
wordCounts
0
20
1
20
2
20
3
20
4
20
5
20
6
20
7
20
8
20
9
20
10
20
11
20