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Run: 2026-07-01-01KWEA1Z9VWEH2MC6XSG2ZGR5A
Run Details
Model:
Claude Sonnet 5 (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
31.7s
Cost:
$0.040700
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 fell steadily over the old manor, its windows glowing faintly like tired, watchful eyes staring into the cold darkness. Detective Mara Hale stepped slowly through the old iron gate, her coat collar raised against the biting wind and rain. A single lantern flickered weakly by the entrance, casting long, trembling shadows across the wet and cracked stone steps below. Inside, the housekeeper stood frozen and pale, her hands trembling as she silently pointed toward the study's heavy oak door. Mara pushed it open and found Lord Ashford slumped motionless over his desk, bathed in the flickering candlelight's dim glow. Blood pooled darkly across the scattered papers, staining the edges of an old, unfinished letter beside his cold, still hand. Mara's eyes narrowed as she slowly scanned the room for anything the killer might have carelessly left behind in haste. Outside, the storm intensified even further, as if the dark night itself sought to bury this house's darkest secret forever.
created_at
"2026-07-01T07:42:20.486Z"
7/1/2026, 7:42:20 AM
model
"anthropic/claude-sonnet-5-20260630"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
5559
moderation_latency
(null)
generation_time
31630
tokens_prompt
46
tokens_completion
543
native_tokens_prompt
60
native_tokens_completion
4058
native_tokens_completion_images
(null)
native_tokens_reasoning
294
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
0.0407
router
(null)
provider_responses
0
endpoint_id
"37b16f45-eeae-45f3-9b85-2137f7c6d61b"
id
"msg_01Ep1HF3N6EnYbDgMk9bLHC3"
is_byok
false
latency
3855
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-1782891740-TSUSQJBPdwsl608nXoTM"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1782891740-9aYKkegNh6H6dMVkMMTo"
upstream_id
"msg_01Ep1HF3N6EnYbDgMk9bLHC3"
total_cost
0.0407
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
8
wordCounts
0
20
1
20
2
20
3
20
4
20
5
20
6
20
7
20