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Run: 2026-07-25-01KYCR3FHJY4M5C86KV1863MQM
Run Details
Model:
Claude Opus 5 (Reasoning, Low)
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
18.1s
Cost:
$0.040025
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 10 words. Please make sure that each sentence has the same length. Only return the opening itself.
Model response
Messages
Meta
AI
Rain hammered the windows of Ashcroft Manor all night long. Inspector Vale arrived at dawn, coat soaked, patience already thin. The butler waited beneath the portico, holding a black umbrella. He said nothing useful, only pointed toward the library door. Inside, Lord Ashcroft lay facedown across a Persian rug, dead. A silver letter opener protruded from between his shoulder blades. No blood stained the carpet, which struck Vale as odd. Someone had moved the body here after the killing occurred. Three cups of cold tea sat waiting on the desk. Only one bore lipstick, faint coral, pressed against the rim. Above the fireplace, a stopped clock read exactly four o'clock. Vale checked his pocket watch and frowned at the discrepancy. Behind him, footsteps halted abruptly in the corridor's deep shadow. He turned slowly, and the whole house held its breath.
created_at
"2026-07-25T13:40:44.729Z"
7/25/2026, 1:40:44 PM
model
"anthropic/claude-opus-5-20260723"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
4862
moderation_latency
(null)
generation_time
17981
tokens_prompt
46
tokens_completion
400
native_tokens_prompt
60
native_tokens_completion
1589
native_tokens_completion_images
(null)
native_tokens_reasoning
185
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
0.040025
router
(null)
provider_responses
0
endpoint_id
"76cb4608-f48c-483d-8da8-9957fb44244e"
id
"msg_011CdNsTwbChqUujr3dSgHrB"
is_byok
false
latency
2140
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-1784986844-tUUVQ6R14J8A72B4YoCO"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1784986844-u2Mqpc19P5BYJg6rSA8c"
upstream_id
"msg_011CdNsTwbChqUujr3dSgHrB"
total_cost
0.040025
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
14
wordCounts
0
10
1
10
2
10
3
10
4
10
5
10
6
10
7
10
8
10
9
10
10
10
11
10
12
10
13
10