{"passport":{"slug":"unsupervised-sentiment-neuron","display_name":"Unsupervised sentiment neuron","model_type":"language","parameter_count":"4096 units (mLSTM); exact total parameter count not publicly disclosed","context_window":null,"claimed_developer":"OpenAI","confirmed_developer":"OpenAI","developer_confirmed_at":"2017-04-06T00:00:00+00:00","developer_source":"Confirmed via https://openai.com/index/unsupervised-sentiment-neuron","first_appeared_at":"2026-03-05T00:30:57.784832+00:00","first_appeared_on":"rss_pipeline","status":"confirmed","availability":null,"deployment_status":"not_deployed","availability_scope":null,"gate":3,"eu_ai_act":"GPAI","regulatory_status":{"eu_ai_act":"GPAI"},"open_source":true,"weights_available":true,"license":null,"provenance_chain":[],"parent_model":null,"model_family":null,"superseded_by":null,"supersedes":[],"recommended_replacement":null,"product_links":null},"events":[{"event_type":"first_appearance","event_date":"2026-03-05T00:30:57.784832+00:00","title":"First recorded in AI news","detail":"OpenAI has developed an unsupervised system that learns an excellent representation of sentiment, despite being trained only to predict the next character in the text of Amazon reviews.","source_url":"https://openai.com/index/unsupervised-sentiment-neuron","source_name":"OpenAI Blog"}],"delta":{"days_unattributed":null,"claimed_developer":"OpenAI","confirmed_developer":"OpenAI","match":true}}