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Run: 2026-02-24-01KJ8V5HY8NATD19M5NTPHDE04
Run Details
Model:
Claude Opus 4.6 (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
29.3s
Cost:
$0.082780
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
The body lay face down in the garden, half hidden by the roses that had long since begun to wilt. Detective Clara Marsh stepped through the iron gate, her boots sinking into the mud left by last night's heavy rain. She had seen death before, more times than she cared to count, but something about this scene felt deeply wrong. The victim wore an expensive silk dress, now stained dark red with blood that pooled beneath her still, crumpled form. A single pearl earring glinted in the morning light, torn from her ear and discarded carelessly among the thorny stems. Clara knelt beside the woman and pressed two gloved fingers to her neck, already knowing there would be no pulse. Behind her, a young officer retched quietly near the fountain, trying and failing to keep his composure in the dawn. The mansion loomed above them all, its dark windows staring down like the hollow eyes of a skull at midnight. Someone inside that house had killed this woman, and Clara swore silently that she would find out who did it. She stood, brushed the damp earth from her knees, and walked toward the front door without a moment of hesitation.
created_at
"2026-02-24T22:08:58.839Z"
2/24/2026, 10:08:58 PM
model
"anthropic/claude-4.6-opus-20260205"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
1650
moderation_latency
201
generation_time
28969
tokens_prompt
46
tokens_completion
883
native_tokens_prompt
61
native_tokens_completion
3299
native_tokens_completion_images
(null)
native_tokens_reasoning
582
native_tokens_cached
0
num_media_prompt
(null)
num_input_audio_prompt
(null)
num_media_completion
0
num_search_results
(null)
origin
"https://ncbench.com/"
is_byok
false
finish_reason
"stop"
native_finish_reason
"stop"
usage
0.08278
router
(null)
provider_responses
0
endpoint_id
"a8708fb9-08ea-43bb-a3b1-165c87ef09df"
id
"ff2e4c28-9ec3-4ec1-b29e-396328ac59f1"
is_byok
false
latency
1616
model_permaslug
"anthropic/claude-4.6-opus-20260205"
provider_name
"Amazon Bedrock"
status
200
api_type
"completions"
id
"gen-1771970938-9mpuqmFAcgxkBjBxQJr9"
upstream_id
"ff2e4c28-9ec3-4ec1-b29e-396328ac59f1"
total_cost
0.08278
cache_discount
(null)
upstream_inference_cost
0
provider_name
"Amazon Bedrock"
Evaluation details
Result
Evaluator
Details
Meta Data
100.00%
Matches word count
n/a
neededClean
false
sentences
10
wordCounts
0
20
1
20
2
20
3
20
4
20
5
20
6
20
7
20
8
20
9
20