Claude Haiku 5.5

Model id claude-haiku-5-5, released 2026-10-07. Anthropic calls it its 'cheapest, fastest, and most capable small model'. It is priced 90% below Haiku 4.5 for prompts up to 100K tokens ($0.10/$0.50) and 50% below for longer prompts ($0.50/$2.50). It has a 1M context, 128K max output, and is the first Haiku with an effort parameter (default medium). It uses the newer tokenizer (~30% more tokens than Haiku 4.5). The launch table compares it only with Haiku 4.5, GPT-6 Luna and Sonnet 5.5. Cyber safeguards are looser than Sonnet 5.5's but stricter than Haiku 4.5's.