A head-to-head of OpenAI's "GPT-6 Astra" (run through Codex) against Anthropic's "Claude Fable 5.1" across benchmarks and four one-shot practical tests: a browser Fortnite clone, an AI travel landing page, a 15-second motion-graphics explainer, and a 3D globe flight dashboard. Astra won three of the four and tied on motion graphics, while also being roughly half the token cost for similar benchmark scores. The conclusion isn't that Fable 5.1 is bad, but that Anthropic's usage-limit practices plus Astra's edge make splitting subscriptions between both worth considering.
- On reported benchmarks GPT-6 Astra beats Fable 5.1 on essentially everything, but the more meaningful gap is cost: on Terminal Bench 4.0 both land around 56% accuracy while Astra costs $10.35 versus $19.50 for Fable 5.1.
- In the one-shot Fortnite clone test, Codex/Astra produced a playable battle-royale with glider, chests, inventory, building and a map in about 45 minutes; Fable took roughly 90 minutes and 750,000 tokens and came out janky with shaky camera, wonky animations and bad gunplay.
- For the AI travel landing page, Astra used its built-in image model to produce a clean site that didn't read as AI slop, while Fable 5.1 returned a generic light-blue-to-dark-blue layout with self-generated graphics and no motion — described as "night and day."
- The presenter argues front-end results depend heavily on the operator: skilled users supplying reference images and component libraries make the base model matter less, but for median "just build me this" prompting Astra clearly wins.
- Motion graphics was a genuine tie — both models called the Higgsfield MCP and the same skill, routed to Seedance 2.5, and returned solid 15-second explainers.
- On the 3D globe dashboard, Astra's "Orbit" was clean and near-usable with a golden-hour sun-chasing feature, while Fable's "Arclight" prioritized visual spectacle to the point of being hard to read and "many prompts away" from usable.
- Anthropic reported far fewer benchmarks than OpenAI, which the presenter flags as a bummer for comparison.
- Practical recommendation: instead of a $200 20x Anthropic plan (where 20x isn't really 20x and weekly usage is halved), consider two $100 5x plans, one with each provider, to test both on real work.
The single most concrete number in the video — near-identical performance at roughly half the token cost.
At max, we're getting 55.8% accuracy with Fable 5.1, and with Astra, it's 56.7... But where they aren't the same is the cost. At max, I'm at $10.35 for Astra, and I'm at $19.50 with Fable 5.1.
Direct side-by-side of time, token cost and output quality on the hardest task in the test set.
For reference, this took Claude about like an hour and a half to create this, and about 750,000 tokens... overall, I would say just feels a little less polished.
We can say GPT-6 is a big leap forward on the OpenAI side, and Fable 5.1 is just giving us more of what we already like.
It almost feels like visual spectacle became the number one priority with Fable 5.1 versus functionality.
No video, no test, no benchmark is really going to be the same as when you get in there and use it yourself for your projects.