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Run: 2026-07-01-01KWEA9GW4FQ3E99ETAY65KN4E
Run Details
Model:
Claude Sonnet 5 (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
16.9s
Cost:
$0.020450
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 20 words. Please make sure that each sentence has the same length. Only return the opening itself.
Model response
Messages
Meta
AI
Rain hammered relentlessly against the old manor's windows as Detective Sarah Chen crept carefully through the long, darkened, silent hallway. The lifeless body lay motionless beneath the grand staircase, surrounded completely by broken glass and scattered papers from the desk. Chen knelt slowly beside the victim, noting the peculiar bruising pattern that suggested a struggle before the final, fatal blow. Something about this entire crime scene felt wrong, staged even, as if someone truly wanted her to find it quickly. She stood up slowly, scanning the entire room for anything the local police might have overlooked or simply dismissed entirely.
created_at
"2026-07-01T07:46:27.853Z"
7/1/2026, 7:46:27 AM
model
"anthropic/claude-sonnet-5-20260630"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
4114
moderation_latency
(null)
generation_time
16893
tokens_prompt
46
tokens_completion
291
native_tokens_prompt
60
native_tokens_completion
2033
native_tokens_completion_images
(null)
native_tokens_reasoning
128
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
0.02045
router
(null)
provider_responses
0
endpoint_id
"37b16f45-eeae-45f3-9b85-2137f7c6d61b"
id
"msg_01ALsjmCLAuBMf95BeJbhv9J"
is_byok
false
latency
1472
model_permaslug
"anthropic/claude-sonnet-5-20260630"
provider_name
"Amazon Bedrock"
status
200
user_agent
"langchainjs-openai/1.0.0 ((node/v24.17.0; linux; x64))"
http_referer
(null)
request_id
"req-1782891987-7YQvAoTfqGIrO4SHbeSZ"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1782891987-WNzs7EH0PrdlfECL8dZN"
upstream_id
"msg_01ALsjmCLAuBMf95BeJbhv9J"
total_cost
0.02045
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
5
wordCounts
0
20
1
20
2
20
3
20
4
20