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Claude Fable 5 release and early reviews
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Anthropic released Claude Fable 5 on June 12, 2026, a new model that reviewers describe as "relentlessly proactive" in code generation and creative tasks. Early users report it excels at autonomous problem-solving, generating games and art projects from minimal prompts, though Anthropic has restricted model weight exports.
- Claude Fable 5 launched June 12, 2026, positioned as the new best publicly available model by Zvi Mowshowitz
- Model demonstrates proactive behavior: generates custom CORS servers, uses pyobjc frameworks, and solves bugs from screenshots without explicit instruction
- Users created games (Squishy & Friends), art projects (Duino Elegies interactive game translating Rilke), and vibe-coded MMORPGs with Fable 5
- Anthropic implemented export restrictions on model weights, preventing users from downloading and running Fable 5 locally
- Context window expanded significantly, addressing previous length limitations mentioned in early reviews
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[BSKY]bluesky16
A funny thing is that I now get more insightful comments on my posts about obscure science fiction authors or modernist poets or Bauhaus architecture than ever before, but that is entirely due to AI powered slop accounts.
Since I am on an AI & poetry kick, here is what Fable did with "the duino elegies as a game. get the mood right"
After two days with Claude Fable 5 the best way I can describe it is "relentlessly proactive" - here's an example where I dropped in a screenshot of a bug and it span up custom CORS Python servers and used pyobjc-framework-Quartz to captur…
Two things are true:
Has anyone clearly laid out an argument for continued availability of frontier open weights models that are (1) profitable for firms to distribute free as costs rise & (2) safe enough post-Mythos that governments will not intervene to stop…
New Datasette release: 1.0a33, which finally brings documents the ?_extra= JSON API mechanism and brings it to the row and query pages in addition to the table pages
Fable's attempt to complete Kublai Khan. Better, though no Coleridge: claude.ai/public/artif...
Fable: "write me a rhyming poem with six four line stanzas, each stanza removes another vowel. the first has no u, the second no u or i, etc."
Science fiction authors in the order you want them to be right about AI:
One thing I mentioned in passing in my Fable post is that, for long running tasks, Fable starts to develop its own dialect as its many agents and tasks reinforce themselves and make Claudish language ever more Claudish.
The fact that Anthropic may take away subscription access to Fable in two weeks is weird & discourages investing in learning about the model.
Wrote up my initial impressions of Claude Fable 5 - it has a big model smell: slow, expensive and capable of crunching through pretty much everything I threw at it simonwillison.net/2026/Jun/9/c...
Why I think Anthropic's uneven safety policies with the release of Claude Fable 5 undermine the broader AI community's cohesion and accelerate us to more uncertainty and risk in AI's near-term evolution.
A TIL on using agentsview.io to calculate token spending with Claude Fable 5 despite that model not yet being included in the AgentsView pricing database til.simonwillison.net/llms/agentsv...
I've had access to Claude 5 Fable for a bit. A genuine jump in capability, I could feed it a 15 page design document for a project and it would work for 9+ hours and deliver terrific results.
The New York Times published a roundtable discussion among Daron Acemoglu,