Introducing Claude Opus 5.5, the first model in our new Claude 5.5 family.
It performs at the level of Claude Fable 5.1 for most tasks, and costs 40% less to run than Opus 5.
Today, I'm launching https://t.co/5XKAsmIuam:
- The hands-on way to learn AI engineering: LLMs, RAG, agents, evals and inference.
- 50+ interactive labs. Tweak tokenizers, attention, embeddings and KV caches live.
- Train a neural network in your browser and watch it learn.
- Build agentic workflows with tool calls, memory, guardrails and bounded autonomy.
- Ship RAG that works: chunking, hybrid search, reranking, and LLM-as-a-judge evals.
- Production AI: model routing, fallbacks, quantization, caching and cost per request.
- 490+ interview questions, reported from OpenAI, Anthropic, Google, Meta, Amazon, Microsoft, Mistral and 50+ more.
- Every answer is cited from papers and books, or measured on real models.
Introducing DataBull 🎉
I was paying $39/mo for DataFast just to see which posts made me money.
That's $468 a year. Forever. And it goes up as your traffic grows.
So I built my own.
Same idea: revenue by traffic source.
$29 lifetime. Unlimited sites. Unlimited events. Lifetime updates.
> https://t.co/Ky8qQqwtl9
Anthropic cooked really hard with all the 5.5 models 😭 they're all insanely good in their own ways
thinking of downgrading my cursor and upgrading claude to max plan
it sounds like a no brainer to me