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Run: 2026-07-25-01KYCR365NJNXZKD02BPWZ81P9
Run Details
Model:
Claude Opus 5 (Reasoning, Low)
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
25.5s
Cost:
$0.057100
Provider:
Amazon Bedrock
Evaluation summary
Score
Evaluator
Details Link
94.44%
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
The rain had been falling on Ashgrove since last Tuesday. Detective Inspector Maren Volk parked beside the frozen garden gate. Two constables stood beneath the yew tree, saying absolutely nothing. She noted their pale faces, then walked toward the door. Inside, the house smelled of woodsmoke, lilies, and something worse. The body lay across the library carpet, arms folded neatly. Someone had arranged him with care, which troubled her most. Sir Edmund Carew had died sometime before eleven last night. His reading glasses rested on a book about Roman law. The open page was marked with a single dark hair. Maren crouched down and studied the wound without any hurry. A narrow puncture, clean, placed precisely below the left collarbone. No blood had reached the carpet, which seemed quite impossible. Behind her, a woman coughed politely from the hallway shadows. The housekeeper announced she had discovered him just after dawn. Maren stood, brushing dust from her knees, and turned around. "Tell me," she said, "who else slept in this house?" The woman hesitated, counting silently, then answered: seven people total. By morning, only six of those seven were still breathing.
created_at
"2026-07-25T13:40:35.133Z"
7/25/2026, 1:40:35 PM
model
"anthropic/claude-opus-5-20260723"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
3606
moderation_latency
(null)
generation_time
25422
tokens_prompt
46
tokens_completion
710
native_tokens_prompt
60
native_tokens_completion
2272
native_tokens_completion_images
(null)
native_tokens_reasoning
412
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
0.0571
router
(null)
provider_responses
0
endpoint_id
"76cb4608-f48c-483d-8da8-9957fb44244e"
id
"msg_011CdNsTDpygEPVwFWUNsFDD"
is_byok
false
latency
1385
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-1784986835-Mb4buPv4jOejvyIlay6g"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1784986835-orfDLic00ORhXVGKQbla"
upstream_id
"msg_011CdNsTDpygEPVwFWUNsFDD"
total_cost
0.0571
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
94.44%
Matches word count
n/a
neededClean
false
sentences
18
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
15
10
16
20
17
10