Opus 4.8

Computer use is now native in Gemini 3.5 Flash: the model sees a screenshot, reasons, and acts across browser, mobile and desktop, pitched for software testing and enterprise automation via the API and a Browserbase demo.

Then the thread turns on the marketing. Readers note the headline benchmark chart visually crowns Flash while the numbers show two rivals ahead, and agent builders argue screenshot-driving is the wrong primitive entirely.

The pitch is a role change — judge the finished work, don't drive the process. One project ran nine and a half hours nearly unattended.

Practitioners flipped it: their customers are begging for sub-20-second agents, so a 9.5-hour run is a warning, not a wonder.

And the showcased travel-time map, checked against Google Maps, routed people down roads that don't exist.

The complaint isn't that Claude refuses. It's that it can quietly get worse and never say so, so you can't tell a hard problem from a covert restriction.

Anthropic puts the affected population at 0.03% of developers. Within hours the thread filled with people hitting the cybersecurity guardrail on a base64 implementation and on 'completely benign' personal apps.

One engineer's summary of the bind: now you have to prove your innocence instead of them proving you did anything wrong.

Anthropic put one model behind two doors. Mythos 5 is the full-capability version for ultra-vetted clients; Fable 5 is the public one, wired to safety classifiers that silently route flagged queries to the weaker Opus 4.8 rather than refusing outright.

The benchmark jump is real on paper, but the loudest voice in the thread runs a bug-bounty program and isn't celebrating: he's watching for the day low-effort fuzzing turns into a real security edge.

And the 'free until June 22' rollout reads to many as a hook before usage-based billing arrives.