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Claude Sonnet 5.5 rumored within days, as fake GPT-6 Sol benchmark spreads

Anthropic said at the Opus 5.5 launch that Sonnet 5.5 and Haiku 5.5 would follow within weeks, leakers point to Sept 30 or Oct 1, and the author says the circulating "Sonnet 5.5 beats GPT-6 Sol" screenshot is faked from old Sonnet 5 numbers.

agim𓍯
@aGim_asfArchived 2026.09.28Originally posted 2026.09.27
agim𓍯 @aGim_asfOriginally posted 2026.09.27
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Claude Sonnet 5.5 is coming, and it might be days away. Anthropic confirmed it with the Opus 5.5 launch: Sonnet 5.5 and Haiku 5.5 "will follow in the coming weeks" with many of the same upgrades. Leakers are pointing to Sept 30 / Oct 1, with the model reportedly already in partner testing. For reference, Opus 5.5 came in ~40% cheaper and 30%+ faster than Opus 5. If Sonnet gets the same treatment, it's a big deal for anyone building with it. Jsyk the "Sonnet 5.5 beats GPT-6 Sol" leak going around is fake. Those specs are just Sonnet 5's existing numbers.

x.com/agim_asf/status/2104181794668949909Archived 2026.09.28 09:56