Astra changed the bar. This closes the gap on whatever model you already use.
GPT-6 Astra (OpenAI, Sept 3 2026) pushed computer use, scope discipline, and ambiguity handling further than any model before it — enough that OpenAI's own president called it the start of an "AGI era," a claim independent evaluators immediately split on. What actually moved wasn't magic — it's a specific, repeatable set of behavioral rules. Parallax turns those rules into a harness, and pairs it with 36 real prompts, for the 10 leading closed- and open-weight chat models.
Eight verified capabilities, with the honest caveat attached
Every card below is grounded in OpenAI's own announcement and system card, cross-checked against independent evaluators. The "reality check" line is there on purpose — the AGI framing is contested, and pretending otherwise would make this toolkit less useful, not more.
Prompt library: harness + 36 tasks, rendered per model
Pick a model. Every prompt below is the full, ready-to-paste text — the Astra-derived harness (tuned for that model's specific quirks) plus the task, already combined.
Run a harnessed prompt against a free-tier model
Bring your own free API key from a provider below. The request goes straight from your browser to that provider — this site never sees or stores your key unless you tick "remember," which just puts it in your own browser's local storage.
Model line-ups and free-tier availability change constantly. The model slug field is editable — if a suggested slug 404s, check the provider's current model list and swap it in.