Claude Marshmallow and Melon Leaks Point to Opus 5.1
Anthropic might be working on new Claude models called claude-marshmallow-eap and claude-melon-eap. The two identifiers surfaced in third-party developer apps and on Discord around August 24. Anthropic hasn’t officially announced either model yet. There’s no public model card, release date, or API listing for them right now. The leaks have started all kinds of discussions about where these models could fit in Anthropic’s lineup. The most common reading is Marshmallow as Claude Opus 5.1 and Melon as Claude Sonnet 5.1, with a minority suggesting Melon could be a new Haiku-class model. Still, those guesses aren’t confirmed. What really stands out […]













