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Run: 2026-07-25-01KYCRMG3N68CXC8QHNNQ9NZ3R
Run Details
Model:
Claude Opus 5 (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 5 words each
Duration:
13.9s
Cost:
$0.030125
Provider:
Amazon Bedrock
Evaluation summary
Score
Evaluator
Details Link
95.83%
Matches word count
(details)
Model input
User/Human
Please write the opening scene of a murder mystery where each sentence has exactly 5 words. Please make sure that each sentence has the same length. Only return the opening itself.
Model response
Messages
Meta
AI
Rain hammered the greenhouse glass. Inspector Vale hated wet mornings. The body lay among orchids. Her name was Margaret Ashby. Someone had arranged her hands. Palms up, fingers gently curled. A white bloom between them. Vale crouched beside the corpse. No blood stained the tiles. No bruises marked her throat. Only that flower, deliberately placed. Sergeant Pike coughed behind him. The gardener found her here. Doors were locked from inside. Vale studied the fogged windows. One pane showed smeared handprints. They faced the wrong way. Someone pressed out, not in. He stood, brushing wet knees. Wake the family, he said. Nobody sleeps through breaking glass. Pike hesitated at the door. The glass isn't broken, sir. Vale smiled without any warmth. Exactly, Vale said, walking out.
created_at
"2026-07-25T13:50:02.368Z"
7/25/2026, 1:50:02 PM
model
"anthropic/claude-opus-5-20260723"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
3857
moderation_latency
(null)
generation_time
13745
tokens_prompt
46
tokens_completion
313
native_tokens_prompt
60
native_tokens_completion
1193
native_tokens_completion_images
(null)
native_tokens_reasoning
117
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
0.030125
router
(null)
provider_responses
0
endpoint_id
"76cb4608-f48c-483d-8da8-9957fb44244e"
id
"msg_011CdNtB2znGU65Xs1btujWJ"
is_byok
false
latency
1289
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-1784987402-YzIgARIf5KZKHTNKLbar"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1784987402-tqA1coUfuleSpucHkSDE"
upstream_id
"msg_011CdNtB2znGU65Xs1btujWJ"
total_cost
0.030125
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
95.83%
Matches word count
n/a
neededClean
false
sentences
24
wordCounts
0
5
1
5
2
5
3
5
4
5
5
5
6
5
7
5
8
5
9
5
10
5
11
5
12
5
13
5
14
5
15
5
16
5
17
5
18
5
19
5
20
5
21
5
22
10
23
5