{"passport":{"slug":"claude-opus-48","display_name":"Claude Opus 4.8","model_type":"multimodal","parameter_count":null,"context_window":"1,000,000 tokens (200,000 on Microsoft Foundry)","claimed_developer":"Anthropic","confirmed_developer":"Anthropic","developer_confirmed_at":"2026-05-28T00:00:00+00:00","developer_source":"Confirmed via https://www.anthropic.com/news/claude-opus-4-8","first_appeared_at":"2026-05-29T00:30:17.605757+00:00","first_appeared_on":"hacker_news_comment","status":"confirmed","availability":"available","deployment_status":"not_deployed","availability_scope":null,"gate":3,"eu_ai_act":"GPAI","regulatory_status":{"eu_ai_act":"GPAI"},"open_source":false,"weights_available":false,"license":"Proprietary / Commercial API (Anthropic usage policies)","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":"2026-06-04T17:07:52.495013+00:00","title":"First recorded in AI news","detail":"Claude 4.8 has been released and represents a significant improvement over Claude 4.7. The new version demonstrates faster inference, improved reasoning coherence without repetitive mid-thought corrections, reduced hallucination, and better token efficiency. Users report 4.8 performs reliably for complex planning tasks and matches the quality trajectory of earlier successful releases like 4.6.","source_url":"https://reddit.com/r/ClaudeAI/comments/1tqclgf/my_thoughts_on_48_2hrs_in/","source_name":"reddit_claudeai"},{"event_type":"first_appearance","event_date":"2026-06-04T16:39:11.93374+00:00","title":"First recorded in AI news","detail":"Opus 4.8 with 1M context window is anticipated to be released soon in Claude Client (CC) version 2.1.154. The announcement comes from a community observation suggesting the new model may be based on the Mythos architecture.","source_url":"https://reddit.com/r/ClaudeAI/comments/1tq8x4b/opus_48_in_the_newest_cc_v21154/","source_name":"reddit_claudeai"},{"event_type":"first_appearance","event_date":"2026-05-29T00:30:17.605757+00:00","title":"First recorded in AI news","detail":"Claude Opus 4.8 represents a modest but tangible improvement over its predecessor. Users can now disable adaptive thinking in the web UI, addressing previous issues where thinking mode failed to trigger properly or produced subpar outputs. This new toggle control provides users with greater flexibility in model behavior management.","source_url":"https://news.ycombinator.com/item?id=48311843","source_name":"hacker_news_comment"}],"delta":{"days_unattributed":null,"claimed_developer":"Anthropic","confirmed_developer":"Anthropic","match":true}}