Latent Space · 10/8/2026, 15:27:51
Anthropic Releases Claude Haiku 5.5: Intelligence Index Jumps 26 Points with Adaptive Thinking and Tiered Pricing
Anthropic has officially released the lightweight model Claude Haiku 5.5, scoring 43 on the Artificial Analysis Intelligence Index, a 26-point jump from its predecessor. This version introduces effort settings and adaptive thinking to the Haiku series for the first time, alongside tiered pricing, aiming to outperform GPT-6 Luna at the same price point.
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It’s been about a year since Anthropic shipped Haiku 4.5, and with successive launches of Sonnet and Opus and Fable up to 5.5 it was seeming a little forgotten, especially as OpenAI launched Luna 6 alongside Astra and Sol 6.
Well, it’s here, and it’s a welcome update. More in the summary below.
[Artificial Analysis@ArtificialAnlysAnthropic has released Claude Haiku 5.5, scoring 43 on the Artificial Analysis Intelligence Index - up 26 points one year after the last Haiku release Haiku 5.5 is the first Haiku model with Anthropic’s effort settings and adaptive thinking, and Anthropic has introduced tiered …
7 PM · Oct 7, 2026 · 152K Views