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Anthropic released Claude Sonnet 5.5, the second model in its Claude 5.5 lineup after Opus 5.5. The company says it runs over 30% faster and costs up to 30% less per task than Sonnet 5, while keeping the same per-token pricing, and jumps from 10.3% to 70.6% on the Terminal-Bench 4.0 agentic coding evaluation. A third model, Claude Haiku 5.5, is planned for release in the coming weeks.
A Show HN project puts four AI models in a head-to-head Pong match, running each in its own lane where the ball's speed depends entirely on that model's response time. The setup contrasts Jev, a typed-decision model, against chat-based models like GPT-5.6 and Claude Haiku, using Pong specifically because it exposes how chat models struggle with fast, continuous decision-making.
The Haiku operating system project has shipped R1/beta6, its first beta release in roughly two years, arriving just after the open-source project marked its 25th anniversary. The release includes updated documentation covering release notes and press inquiries, and is available as a fresh download or as an upgrade path for existing installations.