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Vibe Coding2026-07-18 · source-backed
The writeup covers a 4.0 stable adding database migrations, nested transactions via db.atomic(), and compound foreign keys, with rc2 work costing about $149.25 in Fable usage. The transferable technique isn't "have the model write code." It's running a model as a dedicated reviewer over a finished diff, where it surfaced five release blockers including a serious transaction bug. Upgrade guide and release notes were written by Fable 5, Opus 4.8, and GPT-5.5 in combination. Heterogeneous model routing applied to documentation, not just subtask dispatch. I've started doing the reviewer pass and it catches things I don't, mostly because it doesn't get bored on file 40.
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Simon Willison pulled the numbers out of an FT report sourced to "people with knowledge of the matter": Anthropic's annualized revenue reached $65bn in July, up from $47bn in May. Six thousand customers spend $100,000 or more a year. The company told investors it expects a pro...
Everyone kept score wrong. When OpenAI shipped GPT-5.6 (the Sol flagship plus Terra and Luna) to GA on July 9, then xAI put out Grok 4.5, Meta dropped Muse Spark 1.1, and Cognition shipped SWE-1.7, the reflex was to ask who won the benchmark. Wrong question. On the Artificial...
On June 9, Anthropic released Claude Fable 5 and Mythos 5 across Claude.ai, Claude Code (CLI and web), and Cowork. The spec sheet: 1M-token context, 128K max output, a January 2026 knowledge cutoff, and pricing at $10 input / $50 output per million tokens. That's double Opus 4...
Terminal-Bench 2.1 results (entries dated June 17) put Codex CLI on GPT-5.5 first at 83.4%, Claude Code on Fable 5 second at 83.1%, and Claude Code on Opus 4.8 at 78.9%. The asterisk matters more than the ranking: Fable 5 and Mythos 5 have been export-suspended since June 12,...
This is the other half of the Fable 5 story, so read them together. While the best coding model in the world is uncallable, an open-weight one quietly posted frontier-adjacent numbers. Per Tom's Hardware, independent benchmarks for the MIT-licensed GLM-5.2 (744B params, 40B ac...
Anthropic shipped Fable 5 on June 9. Willison spent ~5.5 hours stress-testing it: slow and expensive, but it handled everything he threw at it, including agentic coding. (Simon Willison) The tell that it's a real working model and not a benchmark queen: because it post-dated A...
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