A reply claims Claude Icarus 5 has been in testing for weeks
JoshPurtell · x · 2026-07-26
A reply hints that Anthropic’s “Claude Icarus 5” has been under testing for weeks, and another codename, “Logos,” may be the 15T model.
The post is brief and mostly speculative, but it points to possible internal model codenames being discussed in the wild.
Related event: Claude Icarus 5 Reportedly Tested for Weeks with Stunning Results(2 posts)→
More from Models
- User says Opus 5 repeatedly deleted /dev/null in a frustrating real-world test — Turn_Trout · 2026-07-26
- A user says Opus 5 is good, but Fable is better for complex brainstorming — IgorBrigadir · 2026-07-26
- Liquid AI says its open-weight LFM community has passed 40 million downloads — helloiamleonie · 2026-07-26
- Fable and Opus both shift their priors when given more context, user says — dejavucoder · 2026-07-26
- Fable 5 beats Opus 5 on open-ended coding tasks, says developer after 24 hours — johnlindquist · 2026-07-26
- The AI Daily Brief says Fable 5 and GPT-5.6 Sol need new prompting patterns — The AI Daily Brief · 2026-07-26