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Run: 2026-07-25-01KYCR0AZ1RYYSHHR4ZAFX0MKZ
Run Details
Model:
Claude Opus 5 (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
20.2s
Cost:
$0.044175
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 ran black. Inspector Maren Vosk arrived at the lighthouse just past midnight. A young constable waited by the gate, holding a lantern. His face was the color of wet newspaper left outside. "Nobody has touched anything, ma'am," he said, voice barely steady. She nodded once and stepped over the threshold without speaking. The keeper's parlor smelled of lamp oil, salt, and copper. Edmund Grail lay face down beneath the stopped grandfather clock. Someone had arranged his arms carefully, like a sleeping child. That detail bothered Vosk more than the wound itself did. Murder is usually rushed; tenderness afterward means something else entirely. Above them, the great lamp turned, throwing light, then darkness. She crouched, studying the flour dusted across the wooden floorboards. Three sets of footprints crossed it, and one came back. Outside, the sea went on keeping its own dark secrets. Vosk stood slowly and asked who had found the body.
created_at
"2026-07-25T13:39:01.74Z"
7/25/2026, 1:39:01 PM
model
"anthropic/claude-opus-5-20260723"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
5335
moderation_latency
(null)
generation_time
20053
tokens_prompt
46
tokens_completion
421
native_tokens_prompt
60
native_tokens_completion
1755
native_tokens_completion_images
(null)
native_tokens_reasoning
173
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
0.044175
router
(null)
provider_responses
0
endpoint_id
"76cb4608-f48c-483d-8da8-9957fb44244e"
id
"msg_011CdNsLLbpqyh77UzSWDyUN"
is_byok
false
latency
1979
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-1784986741-6vhBUCh5L1jzxh16HHiF"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1784986741-nVFg4HEcwb4Db8zSWPTS"
upstream_id
"msg_011CdNsLLbpqyh77UzSWDyUN"
total_cost
0.044175
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
16
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