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Run: 2026-10-09-01M4FZVM4BPRTJP1XAPXPNJDEP
Run Details
Model:
Claude Haiku 5.5 (Reasoning, Low)
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
3.3s
Cost:
$0.000189
Provider:
Claude Platform on AWS
Evaluation summary
Score
Evaluator
Details Link
66.15%
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 fell hard on Ashford Manor tonight. Detective Harold Quinn stepped carefully through the muddy garden. A single lantern flickered beside the open study window. Inside, the body of Lady Eleanor Vance lay motionless. Her silver pearl necklace had vanished from her throat completely. Quinn knelt beside her, noting the faint scent of bitter almonds. Two teacups sat untouched upon the mahogany side table nearby. One cup still held a thin ribbon of amber liquid. The butler, Thomas Greaves, hovered anxiously in the doorway behind him. "She never drinks alone," Greaves whispered, twisting his trembling hands together. Quinn studied the window latch, which showed fresh scratches around its edge. Someone had entered through this window, or someone wanted it to appear so. He rose slowly, his knees cracking in the damp, cold silence. Outside, thunder rolled across the hills like distant cannon fire. Quinn turned to Greaves and asked, "Who else was in this house tonight?"
created_at
"2026-10-09T09:28:10.129Z"
10/9/2026, 9:28:10 AM
model
"anthropic/claude-haiku-5.5-20261007"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
761
moderation_latency
(null)
generation_time
3269
tokens_prompt
46
tokens_completion
249
native_tokens_prompt
62
native_tokens_completion
365
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
0.0001887
router
(null)
user_agent
"langchainjs-openai/1.0.0 ((node/v24.21.0; linux; x64))"
http_referer
(null)
request_id
"req-1791538090-vHuWvRJSKstkjeHtNAGd"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1791538090-SOK4UNgx4flelHz6JNjg"
upstream_id
"msg_011CfrRgQKeBcSQNBzwKCqV4"
provider_responses
0
endpoint_id
"b6cdf493-3a61-441f-a134-e7944fddb980"
id
"msg_011CfrRgQKeBcSQNBzwKCqV4"
is_byok
false
latency
761
model_permaslug
"anthropic/claude-haiku-5.5-20261007"
provider_name
"Claude Platform on AWS"
status
200
total_cost
0.0001887
cache_discount
(null)
upstream_inference_cost
0
provider_name
"Claude Platform on AWS"
response_cache_source_id
(null)
data_region
"global"
workspace_id
"97e315e5-d303-487d-83c1-83180e8a13d4"
Evaluation details
Result
Evaluator
Details
Meta Data
66.15%
Matches word count
n/a
neededClean
false
sentences
15
wordCounts
0
8
1
9
2
9
3
9
4
10
5
11
6
10
7
10
8
11
9
11
10
12
11
13
12
11
13
10
14
13