Anthropic Two Mysterious Claude Models Exposed, Marshmallow Said to Offer Better Conversation Experience Than Opus 5

Odaily Planet Daily News Developers have discovered two early-access Claude models from Anthropic, codenamed claude-marshmallow-eap and claude-melon-eap.

According to tester feedback, Marshmallow performs better overall than Melon, but neither has yet reached the level of Fable 5. Another tester noted that Marshmallow's conversation experience surpasses that of Opus 5.

Previously, Anthropic has repeatedly seen early models named in the "food name + EAP" format. In early July, Claude Honeycomb EAP briefly appeared in Cursor before being removed; on July 24, Anthropic officially released Opus 5, but the company has never confirmed a direct correspondence between Honeycomb and Opus 5.