Anthropic

Claude AI & AI Safety

Haiku 4.5 Left Claude’s Model Menu: What Users and Developers Should Do

Anthropic removed Haiku 4.5 from Free, Pro and Max chat menus on October 29. Existing conversations continue on Haiku 5.5, while Claude Code and API users still have a choice.

October 31, 2026•7 min read

More Anthropic Coverage

Claude

Claude Prompt Caching: When Five Minutes Beats One Hour

Calculate Claude prompt caching's break-even point, choose a TTL from actual reuse, and diagnose misses without confusing API savings with subscription limits.

Sep 20, 2026·10 min read

Claude Opus

Claude Opus 5.1 or 5.2? What the Astra Rival Rumors Show

Claude Opus update rumors now include 5.2 as well as 5.1. What is sourced, what remains speculation, and what a meaningful everyday rival to Astra would need.

Sep 16, 2026·6 min read

Union Alpha

Union Alpha on OpenRouter: What the Free Mystery Model Offers

Union Alpha is a free anonymous OpenRouter model with image input and tool support. Its listing is real; links to GPT-6 Sol or a new Claude Opus remain unproven.

Sep 16, 2026·5 min read

Anthropic

Dario, METR and the AI Slowdown: Who Gets to Inspect the Frontier?

Amodei's new pacing proposal turns AI safety from a lab promise into an argument about who gets to inspect the lab. The split between embedded evaluators, competitor review, and regulatory coordination is the real fight.

Sep 14, 2026·13 min read

Anthropic

Anthropic's Global Workspace Makes Silent Reasoning More Inspectable

Anthropic's J-space research gives auditors a new way to inspect silent intermediate reasoning. Mixed replication results show why an internal readout still needs a behavioral test.

Sep 8, 2026·7 min read

Anthropic

Claude Fable 5 Got Banned By The US Government. That Is The Real AI Policy Story

The US government ordered Anthropic to suspend Fable 5 and Mythos 5 access for foreign nationals, forcing a global shutdown. The real story is frontier AI becoming controlled infrastructure.

Jun 13, 2026·9 min read

Anthropic

Claude Fable 5: Anthropic's Frontier Model Is A Capability Rationing Test

Claude Fable 5 is not just Anthropic's strongest public model. It is the first Mythos-class release built around public access, fallback routing, data retention, and trusted capability gates.

Jun 12, 2026·15 min read

Qwen3.5

Qwen3.5: The Model Anthropic Didn't Name

Qwen3.5-397B-A17B scores 88.4 on GPQA Diamond at $0.60/M, yet was absent from Anthropic's distillation report. That absence explains more than the names that were included.

Feb 26, 2026·13 min read

19 articles covering Anthropic, Claude AI, and AI safety research

Claude AI & AI Safety

Haiku 4.5 Left Claude’s Model Menu: What Users and Developers Should Do

Claude Prompt Caching: When Five Minutes Beats One Hour

Claude Opus 5.1 or 5.2? What the Astra Rival Rumors Show

Union Alpha on OpenRouter: What the Free Mystery Model Offers

Dario, METR and the AI Slowdown: Who Gets to Inspect the Frontier?

Anthropic's Global Workspace Makes Silent Reasoning More Inspectable

Claude Fable 5 Got Banned By The US Government. That Is The Real AI Policy Story

Claude Fable 5: Anthropic's Frontier Model Is A Capability Rationing Test

Qwen3.5: The Model Anthropic Didn't Name

Claude Prompt Caching: When Five Minutes Beats One Hour

Claude Opus 5.1 or 5.2? What the Astra Rival Rumors Show

Union Alpha on OpenRouter: What the Free Mystery Model Offers

Dario, METR and the AI Slowdown: Who Gets to Inspect the Frontier?

Anthropic's Global Workspace Makes Silent Reasoning More Inspectable

Claude Fable 5 Got Banned By The US Government. That Is The Real AI Policy Story

Claude Fable 5: Anthropic's Frontier Model Is A Capability Rationing Test

Qwen3.5: The Model Anthropic Didn't Name

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