Anthropic Reportedly Tests Claude Opus 5

Anthropic appears to be silently A/B testing Claude Opus 5 with select users, with some interfaces oddly displaying the model as "Opus 4.8" across its web and coding platforms.

2026-07-23 ~ 2026-07-24 · 2 related posts

• Claude Opus 5 appears to be rolling out to some accounts — gaganghotra_ · 2026-07-23
• Claude Opus 5 appears to be rolling out as “Opus 4.8” for some users — legit_api · 2026-07-24