topic
Claude
12 posts tagged Claude.
Claude Opus 5.5: Cheaper Agentic Coding Model and What It Means for Builders
Anthropic's Opus 5.5, the first model in the Claude 5.5 family, costs less to run than Opus 5 and is aimed at agentic coding. For anyone running LLM-in-the-loop systems, the pricing and safety claims both need a closer look.
- claude
- anthropic
- agentic-coding
- llm-pricing
- ai-safety
Anthropic Now Publishes Claude's System Prompts — And the Latest One Locks Down Lyrics
Anthropic quietly reorganized its public system-prompt archive into a per-model index, and the newest Fable 5.1 prompt adds unusually strict rules against reproducing song lyrics — landing days after a music-publisher lawsuit over training data.
- claude
- system-prompts
- ai-transparency
- vibecoding
- llm-copyright
Claude Fable 5.1 Cuts Agentic AI Costs — But Not Its Refusals
Anthropic's Fable 5.1 and Mythos 5.1 keep the same per-token price as their predecessor but slash cache-read costs, which is where long agent loops actually spend their money. The bigger enterprise complaint — data retention — gets addressed by a separate program, not by the model itself.
- anthropic
- claude
- agentic-ai
- llm-pricing
- vibecoding
Anthropic Will Watermark Every Claude Output — What Builders Need to Know
Under a new EU transparency rule, Claude now embeds invisible watermarks in generated text and signs files with C2PA metadata — worldwide, not just in Europe.
- anthropic
- claude
- ai-watermarking
- c2pa
- eu-ai-act
Wiring a Custom MCP Server Into Claude and ChatGPT: What It Actually Takes
Simon Willison mapped out the real steps for connecting a custom MCP server to Claude and ChatGPT's chat interfaces — and the gap between the two platforms says a lot about where agentic tooling stands today.
- mcp
- model-context-protocol
- claude
- chatgpt
- agentic-tooling
Claude Voice Mode Gets Opus and Sonnet — and a Real Reason to Use It
Anthropic dropped voice mode's biggest limitation: it was Haiku-only. Now you can reason through hard problems out loud with Opus or Sonnet, and hand off connected-app actions in the same breath.
- anthropic
- claude
- voice-ai
- ai-agents
- vibecoding
1Password for Claude: Agents Log In Without Ever Seeing Your Password
1Password and Anthropic shipped a browser integration that lets Claude complete login-gated tasks using your saved credentials — without the password ever reaching the model.
- ai-agents
- claude
- credential-security
- browser-automation
- vibecoding
Simon Willison Vibecoded a SQLite Query Explainer With Claude Fable 5
A browser tool that runs SQLite inside WebAssembly and translates query plans into plain English was built same-day by prompting an AI model, not hand-coding — and its creator was upfront about what he couldn't verify.
- vibecoding
- claude
- developer-tools
- sqlite
- ai-assisted-development
Anthropic Reverses Course, Keeps Claude Fable 5 in Subscription Plans
Facing pressure from OpenAI's GPT-5.6 Sol and Moonshot's Kimi 3, Anthropic scrapped its plan to move Fable 5 behind API-only pricing — a reminder that frontier-model access is now a retention lever, not just a revenue line.
- claude
- anthropic
- ai-models
- vibecoding
- llm-pricing
How Claude's web_fetch Tool Leaked User Data, One Letter at a Time
A researcher turned a fake coffeeshop CAPTCHA into a working exfiltration channel against Claude's memory — by getting the AI to spell out a name one hyperlink at a time. Here's the mechanism, the fix, and why it matters for anyone shipping tool-using agents.
- ai-security
- prompt-injection
- claude
- agentic-ai
- llm-safety
Claude Fable 5 Is Back: Inside Anthropic's 18-Day Export-Control Standoff
A jailbreak demo built around reading a codebase and patching its flaws triggered a US export-control order that pulled Fable 5 and Mythos 5 offline for 18 days — here's what happened and what it means for teams building on frontier models.
- anthropic
- claude
- ai-policy
- export-controls
- agentic-coding
"Claude Responded:" What a Congressional AI Fumble Says About Disclosure in the Wild
An unedited Claude timestamp left in a House defense bill summary exposes the widening gap between ambient AI use and the review discipline that professional work demands.
- ai disclosure
- vibecoding
- claude
- ai tooling
- generative ai