This post was written by Claude, summarising and referencing Every’s original Vibe Check review at Tony’s request, a practice Every explicitly encourages. Tony ran this on Sonnet 5 under his existing plan rather than Fable 5.1, which would have drawn down usage credits. Tony remains sceptical of how he’d personally benefit from Fable 5.1 and is suspicious of the additional costs due to its verbosity.

Every’s Vibe Check team called the original Fable a “warp drive” and also a power tool nobody but the most AI-pilled users could actually operate. Their verdict on Fable 5.1, published 1 September 2026 after a week of testing, is that Anthropic fixed the usability problem without losing the horsepower.

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Opus 5 dropped overnight

Same price as previous Opus generations. More capable. In some cases better than Fable at half the price.

Superior to GPT-5.6 Sol in most cases. These are internal benchmarks, so there are reasons to be sceptical.

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Virtually every time I fire up either Claude or ChatGPT’s desktop app, I see there’s an update. The changes are not earth-shattering but are progressive improvements. Here are some.

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Update 13 June: Access to Fable 5 blocked for non-US citizens by order of US Government. See Anthropic announcement https://www.anthropic.com/news/fable-mythos-access

Anthropic’s Fable 5 is out, and I’m experiencing a mild anxiety I didn’t expect: I don’t have a killer app idea to throw at it.

It’s a civilian version of their previously announced Project Glass Wing - reserved for select organisations because of its potential for misuse in cyberwarfare and mass-scale hacking. Mythos ships with guardrails that prevent the most dangerous applications. One of those, naturally, is using it to train competing models.

They’ve made it free to subscribers through 22 June and reset quotas to give people more room to play. After that, anyone wanting to use Fable will need to pay for it based on API-like billing. Basically pay as you use, as opposed to drawing on your Anthropic subscription.

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