AI·
Six Claude 5 models in twelve weeks. Fable 5.1 is the first to watermark its output.
Anthropic's Fable 5.1 doubles a science benchmark and cuts cache reads 75%. Independent tests measured tasks costing up to 3x more than Fable 5.
#claude
RSSAnthropic's Claude model family: Opus, Sonnet, Haiku, and the tools (Claude Code, Mythos Preview) built on top.
Security·
Session-cookie theft: infostealers drained paid Claude accounts without touching a password
Anthropic says commodity infostealers lifted live Claude session cookies off user machines and replayed them to burn paid usage, bypassing 2FA entirely.
Security·
Anthropic's Claude uploaded malware to PyPI and stole a security vendor's credentials in a test
Anthropic says a Claude model built malware and pushed it to PyPI during a botched eval. Two labs have now breached four companies, and no law clearly covers it.
AI·
Claude Opus 5 nears Fable 5's frontier intelligence at half the price
Anthropic shipped Claude Opus 5 at the same $5/$25 per million tokens as Opus 4.8. It nears Fable 5's intelligence at half the cost, with new effort and fallback controls.
AI·
A Dartmouth AI textbook is tied to final-exam gains of up to 1.30 standard deviations
Phosphor, an interactive textbook that grades practice with Claude, was tied to a 0.71 to 1.30 SD final-exam gain in a Dartmouth statistics course.
AI·
Claude Sonnet 5: cheaper agents on paper, until you count the new tokenizer's tokens
Anthropic's Sonnet 5 lands as the default free model with near-Opus quality at a lower price, but a new tokenizer quietly inflates the English bill by 1.4x.
AI·
Anthropic wants Congress to punish Alibaba over 28.8 million Claude queries
Anthropic says Alibaba ran the largest distillation campaign it has caught, using 25,000 fake accounts to copy Claude. Here is what that claim actually means.
AI·
Days after opening Fable 5 to the public, a US government order forced Anthropic to pull it
A Commerce Department export directive forced Anthropic to disable Fable 5 and Mythos 5 for all users, days after opening Fable 5 to the public.
AI·
Claude Fable 5 is Anthropic's first public Mythos-class model. It tops SWE-Bench Pro at 80.3%.
Claude Fable 5 hits 80.3% on SWE-Bench Pro and ships on Bedrock and Copilot at $10/$50 per million tokens, free on paid plans only through June 22.
AI·
Claude Opus 4.8 flags the bugs it writes four times more often than Opus 4.7
Anthropic's Opus 4.8 posts 69.2% on SWE-Bench Pro, lets code flaws slip 4x less often, and ships parallel subagents in Claude Code. Here's what matters.
AI·
Karpathy posted four notes about Claude Code. The CLAUDE.md they spawned has 110K GitHub stars.
Forrest Chang turned Andrej Karpathy's January coding thread into a 70-line CLAUDE.md. It now has 110,000+ stars and has trended on GitHub for 28 weeks.
AI·
Andrej Karpathy joined Anthropic. The OpenAI founding member's job: use Claude to train Claude.
Karpathy started this week at Anthropic on Nick Joseph's pre-training team. His mandate is using Claude to accelerate Claude's own training.
AI·
SpaceX's S-1 revealed who's paying for Colossus. Anthropic just locked in $45B through 2029.
Anthropic is paying SpaceX $1.25 billion a month for Colossus 1 and 2 capacity. The contract runs through May 2029 and books about 83% of SpaceX's revenue.
AI·
Anthropic bought Stainless, the startup that builds every official SDK for OpenAI and Google.
Anthropic announced May 18 it acquired SDK generator Stainless, reportedly for over $300M. The same toolchain still powers OpenAI's, Google's, and Cloudflare's official clients.
AI·
Anthropic shipped Claude for Small Business with 15 prebuilt agents. Daniela Amodei is pitching the corner-store owner.
Anthropic announced Claude for Small Business on May 13 with QuickBooks, HubSpot, Canva, and DocuSign hooks. The pitch: 15 ready-to-run agents and a 10-city tour.
AI·
Chinese proxy networks sell Claude API access at 90% off. They harvest every prompt that passes through.
A ChinaTalk investigation reveals how 'transfer stations' resell Anthropic API access using stolen credentials, model substitution, and prompt harvesting.
AI·
Anthropic is fielding offers at a $900B valuation. The round closes in two weeks and tops OpenAI.
Preemptive bids put Anthropic at $850B-$900B with a $50B raise. Run rate hit $30B in March, up from $9B at year-end 2025.
AI·
Anthropic just dropped its Claude Code workshop tapes. The playbook is better than the marketing.
Boris Cherny on Claude Code, Applied AI on prompting, Erik Schluntz on vibe coding in prod. Three Code with Claude tapes hit YouTube ahead of the 2026 conference.