Daily AI news, sourcedOfficial news, first rumor reports and substantive progress. Each entry keeps the information published at that time.
- Anthropic lists introducing docs for Claude Fable 5 and Mythos 5
Anthropic's platform docs list an 'Introducing Claude Fable 5 and Claude Mythos 5' page under its models section, per the documentation site.
- Anthropic expands frontier security program with red team and threat intelligence
Anthropic's site lists new frontier red team capabilities, a September threat intelligence report and enterprise frontier safeguards, alongside improving alignment and security efforts.
- Anthropic details Agent Skills for real-world agent deployments
Anthropic published 'Equipping agents for the real world with agent skills' on its site, covering skills for agent deployments.
- Anthropic details Claude text watermark research
Anthropic published research on Claude text watermarking on its site.
- Claude comes to Microsoft Foundry
Anthropic published a partner page for Claude in Microsoft Foundry, per claude.com, listing Claude's availability on Microsoft's AI platform.
- Anthropic site lists Claude Fable and Mythos 5.1 pages
Pages titled 'Claude Fable and Mythos 5.1' appeared on Anthropic's site, suggesting an upcoming model or release; Anthropic has not announced details.
- Anthropic details Claude-discovered novel enzyme system
Anthropic published 'Claude discovers novel enzyme system' on its site, per the research page.
- Claude Code adds an Analytics API
Anthropic published documentation for a Claude Code Analytics API on its platform docs, per the new docs page.
- Artificial Analysis launches Cyber Index for AI agent security
Artificial Analysis launched an independent Cyber Index that benchmarks AI agents on enterprise security tasks.
- VoxelCraft: Claude 5.5 one-shots a full-parity Minecraft 1.16 survival clone
A Reddit post showcases VoxelCraft, a Minecraft 1.16 survival clone with full parity, generated in one shot by Claude 5.5.
- Anthropic tightens Sonnet 5.5 thinking-block restrictions
Anthropic added another layer of restrictions to Sonnet 5.5's thinking blocks: thinking blocks generated by the model are now more constrained in how they can be used.
- Anthropic's claude-api skill for Claude Code adds an auto-tuning workflow
Anthropic's official claude-api skill for Claude Code gained an automatic tuning workflow, per the skill's update.
- Trump and Mike Johnson to host six tech CEOs at White House AI lunch
President Trump and House Speaker Mike Johnson will host executives from six tech companies for lunch at the White House to discuss AI risks and regulation; expected attendees include Meta CEO Mark Zuckerberg, Anthropic CEO Dario Amodei and OpenAI President Greg Brockman.
- Anthropic's Mike Krieger: Haiku 5.5 will round out the family in the coming weeks
Anthropic CPO Mike Krieger said on X that Haiku 5.5 will round out the Claude 5.5 family in the coming weeks.
- Claude can now help build evaluations and hillclimb on them
Anthropic's Claude Devs account announced Claude can now help developers build evaluations and hillclimb on them.
- Anthropic releases Claude Sonnet 5.5, 30%+ faster than Sonnet 5 at the same price
Anthropic says Claude Sonnet 5.5, the second model in the Claude 5.5 family, generates output more than 30% faster than Sonnet 5 and costs up to 30% less per task for most work, at the same $2 per million input tokens and $10 per million output tokens. Anthropic says it scores 70.6% on Terminal-Bench 4.0, versus 10.3% for Sonnet 5, and lands two points below Opus 5.5 on GDPval-AA. It is available now, including on AWS, Google Cloud and Microsoft Azure and on the Claude Platform as claude-sonnet-5-5, and Claude Haiku 5.5 is due in the coming weeks.
- Claude Code 2.1.284 makes Sonnet 5.5 the default model
Claude Code v2.1.284 adds Claude Sonnet 5.5 (claude-sonnet-5-5) as the default Sonnet model on the Anthropic API, per the GitHub release notes. The release notes list 1M context for the model at $2/$10 per million tokens with $0.20 per million cache reads.
- Claude Sonnet 5.5 one-shots a 3D zombie FPS in 49 minutes for $1
A Reddit post shows Claude Sonnet 5.5 one-shot an entire 3D zombie FPS game in 49 minutes at a cost of $1.
- Claude Opus 5.5 is now available
Claude Opus 5.5 is now available, per Anthropic's site. AWS's Kiro team describes it as Anthropic's most capable Opus model yet, delivering Fable 5.1-level performance on most work at 40% lower cost.
- Epic Games' Unreal Engine skills plugin lets Claude Code control Unreal Editor over MCP
Epic Games' Unreal Engine Skills for Claude Code plugin, listed in Anthropic's official Claude Code plugin marketplace, connects Claude Code to Unreal Editor through the Model Context Protocol. It exposes hundreds of tools across more than 30 toolsets, including actors, Blueprints, materials, Niagara, Control Rigs, Sequencer, State Trees, widgets, the Gameplay Ability System and automation testing, and adds an unreal-mcp skill plus a session hook that tells Claude it is in an Unreal project. It requires Unreal Editor running with the ModelContextProtocol and AllToolsets plugins enabled and the MCP server started. The plugin repo has been public since June and was last updated on Sep 17.