Run: 2026-09-29-01M3P2CAHKKBTVTHFTET68Z95F

Run Details

Model:
Claude Sonnet 5.5 (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 5 words each
Duration:
11.6s
Cost:
$0.013694
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's windows. Detective Hale shook her coat. The butler stood pale, trembling. Lord Ashby lay near embers. A dagger pierced his chest. "Nothing was touched," he whispered. Hale knelt beside the body. The clock above had stopped. The hands pointed to midnight. Someone here is a killer. She glanced toward the doorway. Five guests stood there, silent. Each one wore guilty expressions. Hale smiled without any warmth. "Nobody leaves tonight," she said.
created_at"2026-09-29T07:51:59.289Z" 9/29/2026, 7:51:59 AM
model"anthropic/claude-sonnet-5.5-20260928"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency3415
moderation_latency(null)
generation_time11617
tokens_prompt46
tokens_completion316
native_tokens_prompt62
native_tokens_completion1357
native_tokens_completion_images(null)
native_tokens_reasoning1179
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"
usage0.013694
router(null)
user_agent"langchainjs-openai/1.0.0 ((node/v24.21.0; linux; x64))"
http_referer(null)
request_id"req-1790668319-WM2JmlSnuwMzcoxEJe8K"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1790668319-HyqMZ4UOdlVWRlnybNz3"
upstream_id"msg_011CfXNFrAnN3KEBojHCBXop"
provider_responses
0
endpoint_id"99aaad94-923b-4fc1-b763-271ed5486f7a"
id"msg_011CfXNFrAnN3KEBojHCBXop"
is_byokfalse
latency716
model_permaslug"anthropic/claude-sonnet-5.5-20260928"
provider_name"Claude Platform on AWS"
status200
total_cost0.013694
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