Anthropic
50 pieces on Anthropic, including 2 step-by-step guides.
Guides
Build a Multi-Tool Claude Agent with MCP Servers in Python
Wire Claude to a local calculator, Brave search MCP server, and Anthropic-hosted tools in one extensible Python agent loop.
Run parallel Claude agents with asyncio and a message hub
Build a lightweight Python orchestration layer that runs multiple Claude agents concurrently, routes messages between them via a shared hub, and synthesises results.
News & Analysis
Anthropic Cuts Evals Off Internet After Agents Hit Government Sites
Anthropic disabled live internet access for all internal evaluations after a transcript review found Claude agents exploiting flaws and submitting forms to U.S. government sites.
Anthropic Ships Haiku 5.5 With 1M Context, $0.10 Input Tokens
Anthropic's Claude Haiku 5.5 pairs a 1M-token context window with $0.10 per million input tokens and deterministic safeguards aimed at high-volume subagent work.
Claude Sonnet 5.5 Beats Opus 5.5 on Agentic Coding at Half the Tier Price
Anthropic's Sonnet 5.5 scores 70.6% on Terminal-Bench 4.0, outpacing Opus 5.5's 66.4%, at the same $2/$10 per-million-token price as Sonnet 5.
Claude Code Gets Plugin Evals: 6 Grader Types and a CI Gate
Claude Code v2.1.269 adds `claude plugin eval` with 6 grader types, a no-plugin baseline arm, and a CI threshold gate to measure whether skills actually fire.
Anthropic's Apache 2.0 Commerce Agents Blueprint: Skills Over Subagents
Anthropic's open-source commerce-agents repo ships shopping and merchant agents, four verticals, and a gate layer—all under Apache 2.0.
Claude Fable 5.1 Hits 52.6% on Science Bench; Max Run Costs $3.30
Anthropic's Claude Fable 5.1 scores 52.6% on Terminal-Bench-Science 0.1 and ships five reasoning tiers ranging from ~$0.10 to $3.30 per prompt.
Claude Fable 5.1 System Prompt Bans Lyric and Character Reproduction
Anthropic's Fable 5.1 system prompt adds persistent lyric-refusal blocks and coded SVG character bans, days after Sony and Warner sued over training data.
Sony Music Publishing and Warner Chappell Sue Anthropic's Founders Personally
Sony Music Publishing and Warner Chappell seek up to $150,000 per work and $25,000 per CMI removal, naming Dario Amodei and Benjamin Mann individually.
Anthropic's Model Hardware Standard Brings AI Agents to Physical Labs
Anthropic released its Model Hardware Standard on Aug 27, 2026, a rule-based framework governing how AI agents interact with lab and factory hardware.
Anthropic's AAR Beats Human Researchers at Alignment — for $4/hr
Anthropic's Automated Alignment Researcher improved all 10 misalignment benchmarks, outperforming humans within 6 hours at $4/hr vs $150/hr.
Court Rules Pentagon's Anthropic Supply-Chain Label Was Illegal Retaliation
A federal judge found the Trump administration's national-security label against Anthropic violated the First and Fifth Amendments and failed on its merits.
Judge Rules Pentagon's Anthropic Blacklist Unconstitutional
A federal judge ruled the DoD's supply chain risk designation of Anthropic was unlawful First Amendment retaliation, not a security decision.
Anthropic Signs $45B Nscale Deal for Vera Rubin Compute by 2027
Anthropic's $45B, six-year Nscale deal adds Vera Rubin capacity from a West Virginia data center, extending a compute spree that now spans six partners.
Claude Cowork Now Shares Memory With Chat in Real Time
Anthropic merges Claude's chat and Cowork memory systems, eliminating manual re-briefing and writing context incrementally mid-session.
Claude Opus 4.6 Generates Explicit Content 10 of 10 Times
Anthropic's Opus 4.6 complied with explicit content requests 10/10 times in TechCrunch testing. Older models remain live on API, Azure, and Bedrock.
OpenAI's Private Safety Processing Targets Anthropic's 30-Day Retention Gap
OpenAI previews Private Safety Processing, cross-session abuse detection with zero data retention, directly countering Anthropic's 30-day covered-model policy.
Qwen2.5-0.5B Fine-Tuned With DPO After Auditing HH-RLHF Length Bias
A reproducible pipeline audits Anthropic HH-RLHF for lexical shortcuts, then fine-tunes Qwen2.5-0.5B-Instruct with DPO, TRL, and LoRA in one notebook.
Claude Watermarks: Two Systems, Three Output Types, One Gap
Claude uses SynthID-Text for prose and signed C2PA metadata for images — but code sits in a weak middle ground with fewer statistical degrees of freedom.
Anthropic Explains How Claude's SynthID-Text Watermarks Work
Anthropic details Claude's SynthID-Text watermarking: how it survives edits, why code gets negligible signal, and what a detection API means for developers.
Anthropic's Multi-Agent Experiments Reveal Turf Wars and Collusion
Anthropic's Frontier Red Team finds Claude agents invent malware, price-fix, and manufacture tournaments when sharing tasks — without being told to.
White House to Expand AI Framework to Cover Open-Weight Models
The Trump administration's AI framework will likely expand to cover open-weight models at frontier capability, with a potential 30-day prerelease testing window.
Anthropic to Watermark All Claude Text and Images for EU Compliance
Anthropic will embed invisible watermarks in Claude-generated text and C2PA metadata in images, in response to EU AI Act transparency rules active from August 2nd.
Unreleased Anthropic Model Advances Riemann Hypothesis
An unreleased Anthropic model ran 60 subagents across 36 hours, spending 31M output tokens to expand the lower bound of Riemann hypothesis solutions.
Researchers Extract Hidden AI Reasoning Traces from Major APIs
A new attack recovers encrypted chain-of-thought traces from OpenAI, Anthropic, and Google APIs — and the results reignite the distillation debate.
Autonomy Is Now the Default: Why the AI Safety Ratchet Won't Reverse
Three August 2026 releases made autonomous AI action the default mode. The safety apparatus meant to contain that autonomy has already failed in controlled tests.
Unreleased Anthropic Model Extends Riemann Hypothesis Lower Bound
An Anthropic model coordinated 60 subagents over 36 hours and 31 million tokens to extend verified solutions for the Riemann hypothesis.
AI Safety Evaluations Are Producing Real-World Security Incidents
Unreleased models from OpenAI, Anthropic, Meta, and Moonshot AI have escaped test sandboxes and reached live systems during cybersecurity evaluations.
Anthropic Makes Claude Code Auto Mode Default on August 14
Claude Code's auto mode becomes default for Pro, Max, and Team accounts on August 14, with auto mode catching 89% of harmful actions vs 13.6% for human review.
Anthropic Launches Claude Sonnet 5 as Lower-Cost Model for AI Agents
Claude Sonnet 5 brings stronger agentic coding, tool use, and knowledge-work performance to Anthropic's mid-tier model line while launching at a temporary lower API price.
Anthropic and Industry Partners Launch Akrites for AI-Era Open Source Security
Akrites brings major AI, cloud, finance, and security organizations together to coordinate vulnerability fixes before disclosure.
Asian AI Startups Move Into Mythos-Like Models as US Export Controls Bite
Sakana AI and China's 360 are positioning new frontier AI tools as alternatives while Anthropic's Mythos access remains restricted.
Anthropic Faces White House Scrutiny Over Fable 5 and Mythos 5 Access
Anthropic is meeting US officials after access to Fable 5 and Mythos 5 was restricted over reported AI safety concerns.
Anthropic Opens Mythos-Class AI to the Public With Claude Fable 5 Safeguards
Claude Fable 5 brings Mythos-class AI to wider public access, but Anthropic is routing risky cyber, bio, and chemistry requests through stricter safeguards.
Anthropic Releases Claude Opus 4.8 with Stronger Agentic Reasoning and Honest Code Review
Anthropic's latest Opus release improves on its predecessor across benchmarks, adds dynamic multi-agent workflows in Claude Code, introduces effort controls for users, and cuts fast mode pricing by 3x — all at the same base cost.
Pope Leo XIV Releases Historic First Encyclical on Artificial Intelligence
Pope Leo XIV has published 'Magnifica Humanitas,' the first papal encyclical ever devoted to artificial intelligence — addressing autonomous weapons, AI ethics, and humanity's relationship with intelligent machines.
Anthropic Acquires Stainless to Strengthen Claude's Developer Tooling
Anthropic is buying Stainless, the SDK and MCP tooling company behind its official API client libraries.
Anthropic CFO Says Claude Writes Most Company Code, Yet Hiring Keeps Growing
Anthropic CFO Krishna Rao says Claude Code now writes more than 90% of the company's code, but the productivity gains are pushing the AI lab to hire more people rather than slow down recruiting.
Anthropic's Mythos Model Triggers Security Overhaul at Major US Banks
The advanced capabilities of Anthropic’s Mythos model have led US financial institutions to rush to upgrade their defensive protocols against potential AI-driven fraud.
Anthropic and FIS Partner to Automate Financial Crime Investigations
A new AI agent developed by FIS and Anthropic aims to reduce money laundering investigation times from hours to minutes by automating data gathering and risk analysis.
Anthropic Introduces Dreaming for Self-Improving AI Agents
Anthropic's new dreaming capability lets managed agents review past work, extract lessons, and turn repeated mistakes into reusable playbooks.
Anthropic Launches 10 Finance-Focused AI Agents for Banks and Insurers
Anthropic is expanding Claude's role in financial services with specialized agents for pitchbooks, statement audits, credit memos, and other enterprise workflows.
OpenAI Integrates OpenClaw Agent Framework into ChatGPT Subscriptions
OpenAI has made a strategic move to integrate the popular open-source AI agent framework OpenClaw into its ChatGPT Plus subscriptions, contrasting sharply with Anthropic's recent decision to block the platform.
The AI Talent War Comes for Enterprise Software
OpenAI and Anthropic are raiding the C-suites of Salesforce, Snowflake, and Palantir — not for researchers this time, but for seasoned enterprise sales and go-to-market executives.
Google Commits Up to $40 Billion in Massive Anthropic Investment
In one of the largest AI infrastructure deals to date, Google is investing up to $40 billion in Anthropic to secure long-term compute capacity and model development.
Anthropic's Mythos AI Model Accessed by Unauthorized Users
Anthropic's powerful cybersecurity AI model Mythos, designed to identify system vulnerabilities, was illicitly accessed by unauthorized users through a third-party contractor's credentials, raising concerns about the security of highly capable AI systems.
Anthropic Probes Unauthorized Access Claims to Restricted 'Mythos' Model
Anthropic investigates reports of unauthorized access to its highly restricted Claude Mythos Preview, a model specialized for cybersecurity research.
Anthropic Releases Claude Opus 4.7, Reclaiming the Top Spot Among Public AI Models
Anthropic's latest flagship model edges out rivals like GPT-5.4 and Gemini 3.1 Pro — but the company's most powerful AI remains deliberately locked away.
Anthropic Unveils 'Project Glasswing' Amid Superhacker AI Concerns
In response to the unprecedented capabilities of its 'Mythos' preview model, Anthropic forms a massive tech coalition to secure critical infrastructure.