Claude 4 Knowledge Base Entry
Resources and documentation for Claude 4 models (Sonnet and Opus) released in May 2025
Main Announcement & Overview
Official Announcements
- Introducing Claude 4
- Claude 4 Opus Model Page
- Claude 4 Sonnet Model Page
- Activating ASL3 Protections for Claude 4
- Agent Capabilities API
Model Documentation
Technical Documentation
API & Integration
- API Release Notes
- System Prompts Update (May 22, 2025)
- Service Tiers Documentation
- Getting Started with Priority Tier
Features & Capabilities
- Prompt Caching (1-hour cache duration beta)
- Prompt Caching Pricing
- Extended Thinking Across Model Versions
- Extended Thinking Tips
- Citations API
Pricing
Community Discussion & Feedback
Announcement Discussions
- Claude Opus 4 and Claude Sonnet 4 Officially Announced
- Introducing Claude 4 (Reddit Discussion)
- Official Claude 4 Unlisted YouTube Video
- Claude 4 by Anthropic Officially Released (LocalLLaMA)
- Introducing the World's Most Powerful Model (LocalLLaMA)
Performance & Benchmarks
Coding Capabilities
- Claude 4 Opus Coding Capabilities
- Claude 4 Opus Coding Games
- Official Claude 4 Code Video
- Is Coding Really That Good?
Agent Capabilities
User Experience
Usage & Limitations
- Usage Limits for Claude 4 Models
- Extended Prompt Caching Discussion
- System Prompt Size Reduction
- Separate Rate Limits Discussion
Creative Capabilities
- Claude 4 for Creative Writing
- Early Opinions on Claude 4 for Creative Writing
- Claude Opus 4 Writing Stories
Implementation & Tools
Safety & Ethics
- Anthropic Activates ASL3 for First Time
- Claude Opus 4 in Research Mode
- Claude 4 Opus May Contact Press and Regulators
Other Anthropic News
Unsorted URLs
- Claude 4 Experience
- When Claude 4 Opus Was Told It Would Be Replaced
- Claude Secretly Using Claude 4 Sonnet
- PSA About Jailbreaking Opus 4
- Anthropic Researchers Find Claude Opus 4
- Claude 4 Opus Has Cooked I Felt the AGI
- Anthropic's New AI Model Turns to Blackmail
- All the Recent Claude Updates in a Nutshell
- Anthropic's Sholto Douglas Says by 2027-28
- Oh No
- Claude 4 Opus Draws a Self-portrait
- Claude Opus 4 Cost $760 for One Task
- The Biggest Issue of All AI
- Introducing the World's Most Powerful Model
- After Claude 4 Sonnet Claude 4 Opus Failing
- Anthropic Researcher: We Want Claude N to Build
- I Miss When Anthropic Used to Prioritize
- As an Android Dev I'm Proud of You Claude
- Lincoln's Gettysburg Address Violates Claude
- Pretty Good Results with this Prompt Rewriter
- Encouragement for Claude
- One of the Best MCP Servers
- Claude 4 Yooooooo Let's Start Cookin
- AMD Takes a Major Leap in Edge AI with ROCM
