Run: 2026-06-01-01KT1HTNMCW28GX0G78N583AF8

Run Details

Model:
Claude Opus 4.8 (Reasoning, Low)
Test:
N-Length Sentences
Scenario:
Write sentences with 5 words each
Duration:
19.9s
Cost:
$0.019825
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 5 words. Please make sure that each sentence has the same length. Only return the opening itself.

Model response

AI
Rain hammered the old windows. Detective Cole arrived at midnight. The mansion loomed in darkness. A scream had pierced silence. Inside, blood stained the carpet. The wealthy host lay dead. Five guests stood frozen, watching. Each face hid dark secrets. Cole removed his wet coat. Nobody would leave this house. One of them was lying. The truth would emerge tonight.
created_at"2026-06-01T12:16:38.545Z" 6/1/2026, 12:16:38 PM
model"anthropic/claude-4.8-opus-20260528"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency5539
moderation_latency(null)
generation_time9774
tokens_prompt46
tokens_completion160
native_tokens_prompt60
native_tokens_completion781
native_tokens_completion_images(null)
native_tokens_reasoning68
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"
usage0.019825
router(null)
provider_responses
0
endpoint_id"b0d3beaa-5ff7-4666-a749-b1bb2b14c916"
is_byokfalse
latency10046
model_permaslug"anthropic/claude-4.8-opus-20260528"
provider_name"Anthropic"
status504
1
endpoint_id"c17fb1eb-dbda-4889-971f-1f15f517da90"
id"4c954091-f926-4be9-a2ec-b5bb7f194485"
is_byokfalse
latency1513
model_permaslug"anthropic/claude-4.8-opus-20260528"
provider_name"Amazon Bedrock"
status200
user_agent"langchainjs-openai/1.0.0 ((node/v24.16.0; linux; x64))"
http_referer(null)
request_id"req-1780316198-yKAx9IqMmomFc60auF7o"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1780316198-cebZKeZbzcWOvfsym3Zs"
upstream_id"4c954091-f926-4be9-a2ec-b5bb7f194485"
total_cost0.019825
cache_discount(null)
upstream_inference_cost0
provider_name"Amazon Bedrock"
response_cache_source_id(null)

Evaluation details

Result Evaluator Details Meta Data
100.00% Matches word count n/a
neededCleanfalse
sentences12
wordCounts
05
15
25
35
45
55
65
75
85
95
105
115