Claude Haiku 5.5 lands at $0.10/$0.50 per 1M tokens, 90% under Haiku 4.5 for prompts below 100K

Released Oct 7 for subagents and high-volume work, it scores 72.4% on OSWorld 2.1 (offline subset) and 39.2% on Terminal-Bench 4.0 vs 16.4% for GPT-6 Luna, and it's the first Haiku with adjustable effort (medium by default). Prompts over 100K tokens cost $0.50/$2.50, and since it uses slightly more tokens per text Anthropic puts the average saving near 75%; it's already live in GitHub Copilot and Amazon Bedrock.