Anthropic's Claude Fable 5 Is the Dr. Jekyll to Mythos' Mr. Hyde
Anthropic has released a new version of its Mythos-class AI model—now called Claude Fable 5—to the public. The company says Fable 5 uses the same Mythos base model it…
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Top stories
After spooking Trump into safety testing, Anthropic AI models get global release
3d agoAnthropic's new Sonnet 5 model is better at the tasks that are running up enterprise bills - Engadget
4d agoTrump Admin releases Anthropic Mythos to be used by more than 100 US companies, agencies | TechCrunch
1w agoChatGPT’s powerful GPT-5.6 models arrive, but not for you
1w agoHow to run a local AI chatbot on your iPhone - Engadget
…Proprietary models offer two advantages as it relates to timeliness. First, the current pace at which companies like OpenAI are releasing new models means those systems inherently incorporate more recent data since…
Anthropic's Cat Wu says that, in the future, AI will anticipate your needs before you know what they are | TechCrunch
…Anthropic released at least six models last year and has already released almost as many this year. Do you expect this pace of development to continue? Our hope is that it continues…
Claude Opus 4.8 just launched — and Anthropic says it's far less likely to ‘fake’ answers
…called Claude Mythos Preview for cybersecurity work, though Anthropic claims models at that level will require stronger safeguards before broader release. At the same time AI companies continue pushing toward more powerful…
Discussions and forums
Show HN: RunAPI – one API for AI video, image, music, audio, and LLMs
After building a few SaaS apps, I found that connecting many AI model APIs at the same time gets messy very quickly.So I built RunAPI, which lets you call image, video, music/audio, and LLM models with one API key, and I…
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Claude Code vs. Codex
I have been a long time user of Claude Code. I never felt the need to try other coding tools, and the times I did, I always came back. Across many projects, personal and professional, Claude has been my pair programmer. …
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Show HN: Caliper – pass@k reliability testing for Claude Code and Codex skills
Skills for Claude Code and Codex are hard to test. What I mean by hard is that there's no standard way to do it. You evaluate the skill once on something, it looks like it works. You publish it. Then the new super model …
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Show HN: OpenSOP, We got tired of agents lying to us, so we built them a harness
OpenSOP is an early open-source runtime/standard for executable agentic processes.You (or your agent) define a process in YAML, and OpenSOP exposes it as a typed REST API that agents and humans can both use.We built it b…
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Thoughts on Claude Code 2.1.139 Agent View and Background Sessions
Spent half a day trying Claude Code 2.1.139’s new Agent View and background sessions — useful, but still has quite a few rough edges.The first item in the 2.1.139 changelog released on 2026-05-11 was Added agent view (Re…
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Anthropic's Claude Fable 5 Available Again After U.S. Lifts Export Controls
…It outperforms Opus models on longer, more complex tasks. Fable 5 can work autonomously for longer than any prior Claude model. Though Anthropic released Fable 5 with conservative safeguards to prevent misuse…
Anthropic Walks Back Policy That Could Have ‘Sabotaged’ AI Researchers Using Claude
…and we apologize for not getting the balance right.” Anthropic released Claude Fable 5, a version of its latest AI model with additional safety guardrails designed to prevent misuse, earlier this week…
Claude's newest model is a step forward and two steps back, and it's infuriating
…For many, the most anticipated release in the entire wave was Anthropic's newest flagship model, Opus 4.7 . Now, people expressing their disappointment when a new model drops is nothing new…
Microsoft legal is evaluating Anthropic's Claude Fable over how it saves prompts and output
…Anthropic released Claude Fable 5, the company's first publicly released Mythos-level AI model, and while it is state-of-the-art, Microsoft is reportedly running it through its legal department…
Project Glasswing: An initial update
…That is why we have yet to release Mythos-class models to the public. But it’s also why we began Project Glasswing: if a similarly capable model is released without such…
Anthropic’s Claude Science bets on workflow, not a new model, to win over scientists | TechCrunch
…In April, OpenAI released GPT-Rosalind , a specialized model that is fine-tuned for biological reasoning. The difference between the two approaches isn’t only about whether a specialized model is necessary…