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Run: 2026-07-25-01KYCRPG5BF80R5Z6DFBS0P7KG
Run Details
Model:
Claude Opus 5 (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
20.2s
Cost:
$0.045925
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
The rain had stopped, but the gutters still kept talking. Detective Aisling Moore crossed the threshold at half past four. The house smelled of lilies, lemon polish, and something else. Beneath the chandelier lay a man in a grey suit. His left hand still held a glass of untouched champagne. The wound was small, precise, and hidden beneath his collar. Nobody had thought to close his eyes, she noted grimly. Twelve guests waited in the library, still wearing their masks. Somebody among them had lied already, and would lie again. Aisling removed her gloves and asked who found the body. Eleven hands stayed down; the twelfth rose, trembling, very slowly. The girl wore red silk and no mask at all. Outside, thunder answered, and the lights failed for three seconds. When light returned, the champagne glass was no longer there.
created_at
"2026-07-25T13:51:07.955Z"
7/25/2026, 1:51:07 PM
model
"anthropic/claude-opus-5-20260723"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
4927
moderation_latency
(null)
generation_time
20062
tokens_prompt
46
tokens_completion
388
native_tokens_prompt
60
native_tokens_completion
1825
native_tokens_completion_images
(null)
native_tokens_reasoning
180
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
0.045925
router
(null)
provider_responses
0
endpoint_id
"76cb4608-f48c-483d-8da8-9957fb44244e"
id
"msg_011CdNtFvoMfctDwHsSHqgMT"
is_byok
false
latency
2198
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-1784987467-I6x7sq62Eo24Z1G85GiJ"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1784987467-egu5mnM2DlJUUSTFpRHW"
upstream_id
"msg_011CdNtFvoMfctDwHsSHqgMT"
total_cost
0.045925
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
14
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