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Claude Opus 4.8
Anthropic · Multimodal model · Registered 2026-05-29
IDENTITY
Developer
Anthropic
Confirmed by
Confirmed via https://www.anthropic.com/news/claude-opus-4-8
First registered
2026-05-29 (hacker_news_comment)
Developer confirmed
2026-05-28
Gate
PROVENANCE COMPLETE
Status
Available
PROVENANCE
Claimed developer
Anthropic
Confirmed developer
Anthropic
Delta
— · match confirmed
EU COMPLIANCE
AI Act
GPAI ⓘ
PASSPORT FIELDS
Model type
Multimodal
Parameters
Undisclosed
Context window
1,000,000 tokens (200,000 on Microsoft Foundry)
Open source
No
Weights available
No
License
Proprietary / Commercial API (Anthropic usage policies)
PROVENANCE TIMELINE
2026-06-04
First recorded in AI news
Source: reddit_claudeai · https://reddit.com/r/ClaudeAI/comments/1tqclgf/my_thoughts_on_48_2hrs_in/
2026-06-04
First recorded in AI news
Source: reddit_claudeai · https://reddit.com/r/ClaudeAI/comments/1tq8x4b/opus_48_in_the_newest_cc_v21154/
2026-05-29
First recorded in AI news
Source: hacker_news_comment · https://news.ycombinator.com/item?id=48311843
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Full timestamps · Event log · Delta monitoring
/api/public/register/claude-opus-48