Active4 developments · 3 sources · over 7 daysAnthropic Releases Claude Sonnet 5.5 and Code ModsHow it developedOctober 2, 2026Matt WolfeWhere it startedAnthropic Releases Claude Sonnet 5.5 and Code ModsOctober 9, 2026The AI Daily BriefAnthropic Releases Claude Haiku 5.5 for Cost EfficiencyAnthropic released Claude Haiku 5.5 to target cost-efficient AI inference.October 9, 2026Matt WolfeAnthropic Launches Claude Haiku 5.5October 9, 2026Lev SelectorMistral Large 4 and Claude Haiku 5.5 ReleasedMistral releases Large 4 'Le Chonk'.