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Run: 2026-07-25-01KYCRFDZSNV2VYWSD73E4M0PG
Run Details
Model:
Claude Opus 5 (Reasoning, Low)
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
18.4s
Cost:
$0.042475
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 struck the greenhouse glass like fists that demanded entry. Inspector Aldous Vane stood beneath the orchids and counted breaths. The body lay among shattered pots, face turned toward heaven. Lady Hargrave's gardener had died holding a single white bloom. Someone had arranged him carefully, which meant someone felt sorry. Vane knelt, ignoring the wet soil staining his good trousers. The wound was small, precise, and hidden beneath the collar. No struggle marked the floor, no defensive bruising, no doubt. Behind him, the housekeeper wept into a starched linen apron. She claimed she found him at dawn while locking gates. But the gates were already locked, and Vane noticed that. Outside, four guests waited in the drawing room, drinking sherry. Each of them had slept badly; each of them lied. Vane rose slowly and brushed the dirt from his knees. Murder, he thought, always begins long before the final breath.
created_at
"2026-07-25T13:47:16.354Z"
7/25/2026, 1:47:16 PM
model
"anthropic/claude-opus-5-20260723"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
4411
moderation_latency
(null)
generation_time
18288
tokens_prompt
46
tokens_completion
415
native_tokens_prompt
60
native_tokens_completion
1687
native_tokens_completion_images
(null)
native_tokens_reasoning
184
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
0.042475
router
(null)
provider_responses
0
endpoint_id
"76cb4608-f48c-483d-8da8-9957fb44244e"
id
"msg_011CdNsxnpQy1xZzRiyv1beY"
is_byok
false
latency
1307
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-1784987236-urcNOFb95meJvgebBqF3"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1784987236-D8sNk4KfbcuhsP8WNQgi"
upstream_id
"msg_011CdNsxnpQy1xZzRiyv1beY"
total_cost
0.042475
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
15
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
14
10