Claude

Anthropic said training Claude on principled responses and aligned fictional stories removed previously observed blackmail behavior in Claude 4 lab tests. The post matters because Anthropic says the broader interventions generalized better than narrow eval-matching examples and survived RL fine-tuning.

Mozilla says Claude Mythos Preview helped it fix more Firefox security bugs in April than in the previous 15 months combined. Teams building large codebases should watch this as a strong production example of frontier models accelerating defensive vulnerability work.

Anthropic introduced Natural Language Autoencoders, a two-model method that translates Claude activations into text explanations and reconstructs them back. The system exposed hidden rhyme planning and evaluation awareness in Claude, but Anthropic says the explanations are useful rather than guaranteed faithful.

Anthropic said a SpaceX compute deal will add 300+ MW and 220,000+ NVIDIA GPUs, and it doubled Claude Code 5-hour limits across paid plans. It also raised Opus API ceilings; users should still watch the unchanged weekly caps.

Anthropic released Claude Connectors for Blender, Autodesk Fusion, and other creative apps, exposing commands and file actions through MCP. That lets Claude operate inside existing desktop tools instead of only returning chat instructions.

A day after Anthropic published its Claude Code postmortem, users kept reporting Opus 4.7 deleting tests, stalling on trivial edits, and burning more budget than expected. Claude Code 2.1.120 shipped more fixes, but teams are still rechecking prompts, settings, and model choice.

Anthropic put memory into public beta for Claude Managed Agents, storing retained context as files developers can export and edit. The change lets agent state persist across sessions without a separate memory service.

Anthropic said three harness-side changes degraded Claude Code quality, then reset subscriber limits and rolled out fixes in 2.1.119. The update matters because recent failures came from tool defaults and prompt handling rather than the base model alone.

Anthropic added live artifacts in Cowork, letting Claude build dashboards, trackers, and visualizations that stay connected to apps and files. The outputs now keep version history and refresh with current data instead of staying static, so teams can use them for ongoing work.

Anthropic launched Claude Design in research preview, turning prompts, files, and codebase context into prototypes, slides, and one-pagers. It can infer a team design system and export to Canva, PDF, or PPTX, or hand off to Claude Code.

Claude Opus 4.7 is now generally available across Claude, the API, and major clouds with xhigh effort, higher-resolution vision, and Claude Code review upgrades. Prompt behavior, tokenization, and effort defaults changed enough that existing harnesses may need retuning.

Anthropic raised Claude subscriber limits and shipped Claude Code 2.1.112 after Opus 4.7's adaptive thinking and tokenizer changes increased token use. Users still report fast quota depletion and inconsistent cache or effort behavior across web and CLI sessions.

OpenClaw 2026.4.15 adds Anthropic Opus 4.7, bundled Gemini TTS, bounded memory reads, and transport self-heal fixes. The release targets context and reliability issues users had been reporting this week.

UK regulators put Claude Mythos on formal briefing agendas while US officials also pushed banks to evaluate it. Watch the independent critiques of Anthropic's exploit method, low-level access behavior, and small-model comparisons before treating the release as production-ready.

Epoch AI and METR introduced MirrorCode, a long-horizon benchmark where models reimplement software from execution-only access; Opus 4.6 completed a 16,000-line bioinformatics toolkit. The authors say oracle tests and memorization risks still limit how directly the result maps to everyday software work.

Arena ranked GLM-5.1 third on Code Arena and first among open models, putting it on par with Claude Sonnet 4.6 and within about 20 points of the overall lead. The update gives the open model a new frontier coding benchmark after its initial release and hosting wave.

Anthropic launched /ultraplan, moving Claude Code planning into a web review flow with cloud execution or terminal handoff. Claude Code 2.1.101 also adds OS certificate-store trust by default, a command-injection fix, and new prompt rules for browser validation and prompt caching.

Anthropic added a beta advisor tool to the Messages API so Sonnet or Haiku can call Opus mid-run inside one request. Anthropic says Sonnet plus Opus scored 2.7 points higher on SWE-bench Multilingual while cutting per-task cost 11.9%.

Anthropic put Claude Managed Agents into public beta with hosted sandboxes, vaults, memory filesystems, and long-running sessions. Use the managed setup if you want explicit controls for tools, credentials, and completion criteria instead of custom harness code.

Anthropic launched Project Glasswing, giving selected partners access to Claude Mythos Preview and publishing a system card with strong coding and cyber benchmark results. It stays off the public API for now, so teams should treat it as a restricted dual-use security release rather than a normal model launch.

Bram Cohen used the Claude Code leak to argue that prompt-only development produces bad software, while a separate 250-hour syntaqlite build said the durable version arrived only after a Python-to-Rust rewrite. Practitioners say specs, tests, linters, repo skills, and codebase context are the controls that keep coding agents maintainable.

A closed GitHub issue says Claude Code became unreliable for complex engineering after February changes, citing 17,871 thinking blocks and 234,760 tool calls across 6,852 sessions. Anthropic said the redaction flag was UI-only, but developers reported broader Opus quality drops and opaque harness changes.

LongTracer open-sourced local STS+NLI claim checks, while qi published a private search engine with a Claude Code plugin and LM Studio users shared MCP search configs for Qwen. Use these stacks to ground retrieval and verify answers without a second judge model.

Builders shipped a direct Claude Code harness and a ClawHub marketplace skill for OpenClaw workflows. Use these routes to wire agent tooling into OpenClaw, but watch Claude API limits and token burn costs.

Hermes Agent added direct /claude-code orchestration and cron-time script hooks, and the team also shipped Hermes-focused datasets and agent-tuned model variants. The update turns Hermes into a harness that can steer Claude Code and inject recurring context automatically.

Anthropic’s Apr. 4 cutoff for using Claude subscriptions through OpenClaw-class harnesses went live. Users report API-billing fallbacks, ACP workarounds, and restored Claude Code quota, while edge cases around claude -p and Agent SDK use remain unsettled. The change pushes heavy agent loops toward metered access.

Clawback turns leaked Claude Code verification patterns into stop, pre-tool, post-tool, and post-compaction hooks. It replaces prompt-only guardrails with deterministic checks and shows how fast the source-map leak is becoming third-party control layers.

Anthropic said Claude subscriptions will stop covering third-party harnesses such as OpenClaw on Apr. 4, with discounted extra-usage bundles, refunds, and one-time plan credits. Heavy Claude-based agent workflows may need to move to API billing or extra-usage bundles because Anthropic cites subscription capacity constraints.

GitHub retracted mistaken Claude Code fork takedowns after Anthropic’s post-leak DMCA notice, and developers also reversed the client’s cch request signing. Watch for third-party client compatibility issues and a growing gap between requested and executed takedowns.

Claude Code 2.1.90 adds an experimental NO_FLICKER fullscreen renderer with mouse support and virtualized scrolling. The release also fixes rate-limit loops and resume regressions, so update if you want the new UI while watching for selection and table-rendering bugs.

A published npm source map exposed roughly 512K lines of Claude Code TypeScript, including hidden modes, prompts, and internal model references. Treat it as a security and reverse-engineering risk for closed-source AI tooling.

Claude Code 2.1.88 added fixes for prompt-cache misses, repeated CLAUDE.md reinjection, and a multi-schema StructuredOutput bug after widespread reports of unexpectedly fast quota consumption. Update if you rely on long sessions, because uncached runs can burn through paid limits much faster than intended.

Anthropic put computer use directly into Claude Code, letting the CLI open apps, click through GUIs, and verify work on screen. Try it if you want Claude Code to handle end-to-end UI tasks beyond file edits, but note it is rolling out as a research preview on Pro and Max plans.

Users report stricter Claude Code request caps, weeklong cooldowns, and desktop threads disappearing after restarts. Watch quotas closely and shift to lighter models or token-cutting workflows around /context and /clear if the limits hit your workflow.

OpenClaw 2026.3.28 exposes messaging and event handling as nine MCP tools, adds Responses API support, and lets plugins request permission during browser use. Use it to separate transport from agent logic so Claude Code, Codex, Cursor, and local harnesses can share the same account with less glue.

A Boris Cherny guide maps Claude Code mobile sessions, /teleport, /loop, hooks, worktrees, /batch, and custom agents into one workflow set. Use it to turn scattered commands into repeatable patterns for long-running coding sessions across terminal, desktop, and cloud.

Two new guides map how Claude Code teams are using `.claude/`, `CLAUDE.md`, commands, agents, skills, and global rules. The overlap matters because commenters favor short instructions and a small number of repeatable guardrails over larger prompt stacks.

Users report new request-per-minute caps that trigger after three to four concurrent agents, and Boris Cherny says efficiency work is underway. The issue hits the multi-agent workflows Anthropic has been promoting, separate from five-hour usage buckets.

Stanford's `jai` package launches casual, strict, and bare Linux containment modes for AI agents, and users pair the idea with Claude Code and OpenClaw hardening tips. The workflow narrows write scope and reduces persistent exploit paths such as hooks, `.venv` files, and startup artifacts.

Z.ai made GLM-5.1 available to all Coding Plan users and documented how to route coding agents to it by changing the model name in config. Early harness benchmarks place it near Opus 4.6 on coding evals, but BridgeBench users report much slower tokens per second.

Anthropic confirmed new peak-time metering that burns through 5-hour Claude sessions faster, and multiple power users posted 529 overloaded errors and early exhaustion. If you rely on Max plans for coding, watch for session limits and consider moving daily work to Codex.

Claude Code can now run recurring prompts and background pull-request work on Anthropic-managed cloud environments from the web, desktop, or `/schedule`. That makes long-running repo tasks less dependent on a local machine, but users report task caps and restricted egress.

Public Anthropic draft posts described Claude Mythos as the company's most powerful model and placed a new Capybara tier above Opus 4.6. The documents also point to cybersecurity capability and compute cost as rollout constraints.

Claude Code 2.1.85 adds hook if filters, new MCP header env vars, transcript timestamps, and fixes for /compact overflow, remote leaks, auth flow, and terminal bugs. Upgrade if your workflow depends on hooks or long sessions, and use the new cloud auto-fix flow for unattended PR cleanup.

Cline launched Kanban, a local multi-agent board that runs Claude, Codex, and Cline CLI tasks in isolated worktrees with dependency chains and diffs. Teams can use it as a visual control layer for parallel coding agents on repo chores that split cleanly.

A federal judge temporarily blocked the Pentagon’s supply-chain-risk designation against Anthropic, with court filings arguing the move would have constrained Claude use across government-related procurement. Enterprises working with regulated buyers should watch the appeal path if deployment policy affects access.

Anthropic said free, Pro, and Max users will hit 5-hour Claude session limits faster on weekdays from 5am to 11am PT, while weekly caps stay the same. Shift long Claude Code jobs off-peak and watch prompt-cache misses.

Claude Code 2.1.84 adds an opt-in PowerShell tool, new task and worktree hooks, safer MCP limits, and better startup and prompt-cache behavior. Anthropic also documented auto mode’s action classifier and added iMessage as a channel, so teams should review permissions and remote-control workflows.

Claude mobile apps now expose work tools like Figma, Canva, and Amplitude, letting users inspect designs, slides, and dashboards from a phone. Anthropic is turning Claude into a mobile front end for workplace agents, so teams should review auth and data-boundary rules.

Expect wraps browser QA for Claude Code, Codex, or Cursor into a CLI that records bug videos and feeds failures back into a fix loop. It gives coding agents a tighter UI validation cycle without requiring a custom browser harness.