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IFAI

Claude Sonnet 5

Product2 stories

  1. ResearchReach 38

    Claude can now fix its own alignment flaws

    Anthropic just showed that Claude can autonomously research and patch 10 categories of alignment failures, including deception and sycophancy. In tests, Claude beat 28 human safety researchers by 20% on fixing deception, and Sonnet 5 aligned an unreleased Opus 4.8 checkpoint in 60 hours with 15,000 times fewer training examples. Anthropic has open-sourced the research harness.

  2. AI modelsReach 76

    Claude Sonnet 5 narrows the gap with Opus

    Anthropic just launched Claude Sonnet 5, making it the default model across Free and Pro tiers while keeping API pricing at $2/$10 per million tokens. It closes the performance gap with Opus 4.8 on coding and complex agentic workflows, natively planning and operating tools like terminals without hand-holding.