Run: 2026-05-29-01KSSK8ASGHWGKVW45G685GTEA

Run Details

Model:
Claude Opus 4.8 (Reasoning)
Test:
Data extraction
Scenario:
Contextual pronoun
Duration:
2.7s
Cost:
$0.001635
Provider:
Anthropic

Evaluation summary

Score Evaluator
Details Link
Pass Matches text (details)
Pass Matches Regex (details)
no eval Overall

Model input

User/Human
Who does "he" refer to in the last sentence? Only return the name. Tom and Jerry were playing in the yard. Spike, the dog, was watching them from his kennel. Suddenly, he started barking loudly.

Model response

AI
Spike
created_at"2026-05-29T10:07:39.32Z" 5/29/2026, 10:07:39 AM
model"anthropic/claude-4.8-opus-20260528"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency2254
moderation_latency(null)
generation_time2665
tokens_prompt51
tokens_completion31
native_tokens_prompt77
native_tokens_completion50
native_tokens_completion_images(null)
native_tokens_reasoning29
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"
usage0.001635
router(null)
provider_responses
0
endpoint_id"b0d3beaa-5ff7-4666-a749-b1bb2b14c916"
id"msg_01W2fDpNv2uEbb9frVTe4xE9"
is_byokfalse
latency1023
model_permaslug"anthropic/claude-4.8-opus-20260528"
provider_name"Anthropic"
status200
user_agent"langchainjs-openai/1.0.0 ((node/v24.16.0; linux; x64))"
http_referer(null)
request_id"req-1780049259-v17eFUs8zMX7uhHNERRI"
session_id(null)
api_type"completions"
id"gen-1780049259-tgCQs0jXkRXnop7Eg9lF"
upstream_id"msg_01W2fDpNv2uEbb9frVTe4xE9"
total_cost0.001635
cache_discount(null)
upstream_inference_cost0
provider_name"Anthropic"
response_cache_source_id(null)

Evaluation details

Result Evaluator Details Meta Data
Pass Matches text
Case sensitive: Spike
 n/a
Pass Matches Regex
/\bSpike\b/
 n/a
no eval