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Run: 2026-07-01-01KWEA6YER433AVAJZS1D54582
Run Details
Model:
Claude Sonnet 5
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
8.6s
Cost:
$0.004840
Provider:
Amazon Bedrock
Evaluation summary
Score
Evaluator
Details Link
0.07%
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
# The Last Guest Rain hammered the old mansion's windows while thunder rolled across the darkened hills like distant cannon fire. Detective Sarah Chen stepped carefully over the threshold, her flashlight cutting through shadows that danced menacingly. The body lay sprawled beneath the grand staircase, blood pooling dark against the marble floor. Seven guests remained trapped inside, each one nervously avoiding the others' suspicious, calculating glances. The storm had knocked out power hours ago, leaving only candlelight to illuminate their fear. Someone in this house had murdered Victor Blackwood, and someone knew exactly why. Sarah pulled her notebook out, ready to unravel this tangled web of lies. "Nobody leaves," she announced firmly, watching how each suspect reacted differently. The butler wrung his hands while the widow stared blankly at nothing. Outside, the storm intensified, trapping killer and investigator alike within these walls. Somewhere in this mansion, crucial evidence waited patiently for someone to discover it. Sarah's instincts told her this wouldn't be a simple, straightforward case. Every person here had secrets worth killing to protect completely. The grandfather clock struck midnight, echoing ominously through the tension-filled corridors. She knelt beside the body, examining the peculiar wound with practiced precision. This was going to be a very long, dangerous night indeed.
created_at
"2026-07-01T07:45:03.459Z"
7/1/2026, 7:45:03 AM
model
"anthropic/claude-sonnet-5-20260630"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
1553
moderation_latency
(null)
generation_time
8593
tokens_prompt
46
tokens_completion
358
native_tokens_prompt
60
native_tokens_completion
472
native_tokens_completion_images
(null)
native_tokens_reasoning
0
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
0.00484
router
(null)
provider_responses
0
endpoint_id
"37b16f45-eeae-45f3-9b85-2137f7c6d61b"
id
"msg_019PQMMB577zZ4cNiHNa6SfU"
is_byok
false
latency
1553
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-1782891903-J0obQRgtyj2t2wu8gJy5"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1782891903-n2I1aCnbLvGvj4L8714h"
upstream_id
"msg_019PQMMB577zZ4cNiHNa6SfU"
total_cost
0.00484
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
0.07%
Matches word count
n/a
neededClean
false
sentences
17
wordCounts
0
4
1
17
2
16
3
15
4
14
5
15
6
13
7
13
8
11
9
12
10
12
11
13
12
11
13
10
14
11
15
12
16
11