Anthropic ships Claude Haiku 5.5: +26 points in a year, 10x cheaper than predecessor

ArtificialAnlys · x · 2026-10-08

Anthropic has released Claude Haiku 5.5, scoring 43 on the Artificial Analysis Intelligence Index — up 26 points in one year — and it's the first Haiku with effort settings, adaptive thinking, and tiered pricing.

Key takeaways

Leading small-model performance: at max effort it edges out GLM-5.3 Flash (42), Gemini 3.8 Flash (41) and GPT-6 Luna (38), is comparable to open-weights Kimi K3 (44), and trails Claude Sonnet 5.5 (56) by 13 points.
Heavy token usage: 162k output tokens per Intelligence Index task at max, roughly 3x GPT-6 Luna; moving from xhigh to max buys 2 points for 1.8x tokens.
Strong agentic knowledge work: 1578 Elo on AA-Briefcase, ahead of Kimi K3 and GLM-5.3.
Terminal use jumps: 33% on Terminal-Bench 4.0, up from 0% for Haiku 4.5.
Narrower knowledge, fewer hallucinations: 36% AA-Omniscience accuracy vs 55% for Gemini 3.8 Flash, but hallucination rate is lower (40% vs 55%).
AutomationBench likely understated: 35% due to a pre-release over-refusal safety bug that Anthropic is fixing.

Pricing & specs: $0.10/$0.50 per 1M input/output tokens under 100k context (10% of the previous Haiku's price), stepping up 5x above 100k; context window expanded from 200k to 1M tokens; text and image input.

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Anthropic ships Claude Haiku 5.5: +26 points in a year, 10x cheaper than predecessor

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