Run: 2026-09-29-01M3P2B9T4SXHEZCE3P6Q35A7S

Run Details

Model:
Claude Sonnet 5.5 (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 5 words each
Duration:
8.8s
Cost:
$0.009874
Provider:
Claude Platform on AWS

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 5 words. Please make sure that each sentence has the same length. Only return the opening itself.

Model response

AI
Rain hammered the manor windows. Inspector Hale shook his coat. Nobody greeted him at midnight. The maid pointed upstairs, trembling. Ashby lay beside the hearth. Blood darkened the pale carpet. A shattered glass glittered nearby. Hale knelt beside the body. No forced entry, no weapon. Every guest had a motive. The clock struck twelve slowly. Somebody in this house lied. Hale lit his pipe quietly. Then the lights went out. A scream echoed through darkness.
created_at"2026-09-29T07:51:25.769Z" 9/29/2026, 7:51:25 AM
model"anthropic/claude-sonnet-5.5-20260928"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency3573
moderation_latency(null)
generation_time8832
tokens_prompt46
tokens_completion258
native_tokens_prompt62
native_tokens_completion975
native_tokens_completion_images(null)
native_tokens_reasoning796
native_tokens_cached0
num_media_prompt(null)
num_input_audio_prompt(null)
num_media_completion0
num_search_results(null)
num_fetches(null)
web_search_engine(null)
origin"https://ncbench.com/"
is_byokfalse
finish_reason"stop"
native_finish_reason"end_turn"
service_tier"default"
usage0.009874
router(null)
user_agent"langchainjs-openai/1.0.0 ((node/v24.21.0; linux; x64))"
http_referer(null)
request_id"req-1790668285-N1Mh7Nem5wbR8VcDlyWQ"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1790668285-3p9msqBwd59u8d7Vg9hc"
upstream_id"msg_011CfXNDNdGoDuiTutQwwG39"
provider_responses
0
endpoint_id"99aaad94-923b-4fc1-b763-271ed5486f7a"
id"msg_011CfXNDNdGoDuiTutQwwG39"
is_byokfalse
latency636
model_permaslug"anthropic/claude-sonnet-5.5-20260928"
provider_name"Claude Platform on AWS"
status200
total_cost0.009874
cache_discount(null)
upstream_inference_cost0
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
100.00% Matches word count n/a
neededCleanfalse
sentences15
wordCounts
05
15
25
35
45
55
65
75
85
95
105
115
125
135
145