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Run: 2026-07-25-01KYCRH6X999SRQPH6FHTSYWZS
Run Details
Model:
Claude Opus 5 (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 5 words each
Duration:
16.9s
Cost:
$0.029950
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. A body lay among orchids. Someone had arranged the limbs. Arms crossed, like a saint. White petals circled the face. Vale crouched beside the corpse. No blood stained the soil. That detail troubled him most. The victim wore evening clothes. Silk tie, still perfectly knotted. One shoe was missing entirely. Sergeant Ames coughed behind him. "The gardener found him, sir. She hasn't stopped shaking since." Vale nodded without looking up. "Who owns this estate now?" Ames checked his damp notebook. "The dead man did, apparently." Vale finally stood, knees protesting. Rain drummed a patient rhythm. Nine windows, all latched inside. The door key remained turned. Nobody could have walked out. And yet someone clearly had.
created_at
"2026-07-25T13:48:14.644Z"
7/25/2026, 1:48:14 PM
model
"anthropic/claude-opus-5-20260723"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
5825
moderation_latency
(null)
generation_time
16725
tokens_prompt
46
tokens_completion
460
native_tokens_prompt
60
native_tokens_completion
1186
native_tokens_completion_images
(null)
native_tokens_reasoning
258
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
0.02995
router
(null)
provider_responses
0
endpoint_id
"76cb4608-f48c-483d-8da8-9957fb44244e"
id
"msg_011CdNt3BEANnxwtvi6J6LCP"
is_byok
false
latency
3079
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-1784987294-KpH4ShtlcaCLSkKfap8O"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1784987294-5TOkBA5UvmTdgHevi4uu"
upstream_id
"msg_011CdNt3BEANnxwtvi6J6LCP"
total_cost
0.02995
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
10
14
5
15
5
16
5
17
5
18
5
19
5
20
5
21
5
22
5
23
5