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Run: 2026-07-25-01KYCPP79G0SDE5WCPGK6QZR68
Run Details
Model:
Claude Opus 5
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
9.1s
Cost:
$0.009750
Provider:
Amazon Bedrock
Evaluation summary
Score
Evaluator
Details Link
68.52%
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 Ashgrove Manor for three days, turning the gravel drive into a river of mud. Inspector Nora Kell stepped from her car and counted seven lit windows, though the household should have been asleep. She had received the telephone call at four in the morning, a woman's voice, breathless, refusing to give names. The front door stood open, swinging gently, and rainwater had already darkened the Persian runner just inside the threshold. In the library, beneath a portrait of a man holding a spaniel, lay Sir Edmund Ashgrove, quite thoroughly dead. His right hand still gripped a fountain pen; his left had torn a page from the ledger on the desk. Nora crouched beside him, noting the absence of blood, the odd blue tinge along the lips and fingernail beds. Behind her, someone cleared their throat, and she turned to find four people watching her from the darkened hallway. None of them wore nightclothes, which struck her as the single most interesting fact she had learned that morning. "Which one of you telephoned?" she asked, and the silence that answered lasted precisely eleven seconds by her watch.
created_at
"2026-07-25T13:16:01.717Z"
7/25/2026, 1:16:01 PM
model
"anthropic/claude-opus-5-20260723"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
1736
moderation_latency
(null)
generation_time
9020
tokens_prompt
46
tokens_completion
290
native_tokens_prompt
60
native_tokens_completion
378
native_tokens_completion_images
(null)
native_tokens_reasoning
0
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
0.00975
router
(null)
provider_responses
0
endpoint_id
"76cb4608-f48c-483d-8da8-9957fb44244e"
id
"msg_011CdNqabqGs39knRnSS8iwG"
is_byok
false
latency
1736
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-1784985361-a6gsthdll30IcdF1CAxX"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1784985361-yPrAOHGZ1keP30yZtKsj"
upstream_id
"msg_011CdNqabqGs39knRnSS8iwG"
total_cost
0.00975
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
68.52%
Matches word count
n/a
neededClean
false
sentences
10
wordCounts
0
20
1
19
2
19
3
19
4
19
5
20
6
19
7
19
8
19
9
19