Claude Sonnet 5 is officially live. This is the new best daily AI model in the world. Here's everything you need to know: It's the most agentic Sonnet model Anthropic has ever shipped, closing the gap with Opus 4.8 while staying significantly cheaper. → Default model for Free and Pro plans, available everywhere now → Launch pricing: $2/$10 per million tokens (input/output) through August 31, then $3/$15 after → Lower hallucination and sycophancy rates than Sonnet 4.6 → Better at refusing malicious requests and resisting prompt injection attacks → Available in Claude Code, Claude Platform, and via API as claude-sonnet-5 Huge cost curve reduction. Sonnet 5 now sits in the same performance range that used to require Opus-class pricing. Now we just need Fable 5 back!(Miles Deutscher)