Claude by Anthropic
A family of foundational AI models
5.0•885 reviews•65K followers
A family of foundational AI models
5.0•885 reviews•65K followers
We're an AI research company that builds reliable, interpretable, and steerable AI systems. Our first product is Claude, an AI assistant for tasks at any scale.
This is the 42nd launch from Claude by Anthropic. View more
Claude Sonnet 5
Launched this week
Our most agentic Sonnet yet, with top-tier intelligence for coding and everyday professional work.
Free Options
Launch Team
Codex 3.0 by OpenAI
ChatGPT by OpenAI
Hey Hunters! 👋
I'm excited to hunt Claude Sonnet 5 today.
Claude Sonnet 5 is Anthropic's most agentic Sonnet yet—able to plan, use tools like browsers and terminals, and complete complex tasks autonomously. It delivers major improvements in reasoning, coding, and knowledge work, with performance approaching Opus 4.8 at a lower cost.
Now available across all Claude apps for Free, Pro, Max, Team, and Enterprise users. What will you build with it?
I run Sonnet in long agent loops, so the thing I'm watching is tool-call stability: how many calls it chains before it drifts off the original plan. Older Sonnets would start second-guessing a decision they'd already committed to around call 15, which quietly derails an autonomous run. If Sonnet 5 holds the plan through a deep terminal-and-browser session, that's worth more to me than a few SWE-bench points. Anyone pushed it on long-horizon stability yet?
The agentic framing is the interesting shift here, more than the benchmark bump. Curious about the guardrail side though - when it's chaining terminal and browser calls on its own, is there a built-in checkpoint before anything irreversible (deleting files, submitting a form, sending a message) or is that entirely left to whoever builds the wrapper app? That's the part that decides whether I'd actually trust it running unattended overnight.
Switched from ChatGPT to Claude a few months back and never looked back. Built my entire product on top of it, and what actually mattered was reasoning through the hard decisions when stuff broke. Raw code generation is the easy part. Curious how much of the "agentic" jump in Sonnet 5 shows up there specifically, not just clean-run coding benchmarks. That's where the real work lives.
How does Claude handle really long documents compared to other assistants you've tried, and is there a hard cap on context length I should know about?
How does Claude handle really long documents compared to other models I've tried, and is there a way to feed it multiple files at once or do I have to paste everything in?
How does the pricing scale for heavier workloads, and are there any caps on context length or API rate limits I should watch out for at the higher tiers?