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Fable 5 autonomously runs multi‑hour workflows, self-checks and improves outputs…

2026-06-10 · 01:41 UTC ·@dr_cintas ·1 min read

Brief

Fable 5 autonomously runs multi‑hour workflows, self-checks and improves outputs before returning results, and — according to @dr_cintas (2026-06-10) — outperforms Opus 4.8 on five ambitious benchmarks (asteroid visualization, 100‑acre fitness retreat site plan, Apollo control panel reconstruction, World Cup jersey supply-chain simulation, solar‑flare aurora effects). Hyperagent reports higher visual reasoning and sometimes lower cost; Fable 5 is available on Hyperagent.

Source evidence

Fable 5 is legit absurd.

You give it a goal.
It runs alone for hours.

It checks its own work and improves it before handing anything back.

Here it is against Opus 4.8 on 5 tasks 👇

→ Visualize every asteroid in the solar system from NASA data
→ Design a site plan for a 100-acre fitness retreat
→ Reconstruct Apollo control panels from technical PDFs
→ Simulate World Cup jersey supply chains by match outcome
→ Show how solar flares affect the auroras

It’s producing the most ambitious agent work I’ve seen.

hyperagentpartner

Video

Hyperagent (@hyperagentapp)

Fable 5 on Hyperagent is producing the most creative, ambitious work we've ever seen from our agents.

They're self-improving for hours towards open-ended goals. Visual reasoning has spiked noticeably. Outputs are consistently higher quality than Opus, occasionally at lower cost.

5 of our test cases below vs. Opus 4.8 👇

  1. Visualize all asteroids in the solar system from NASA data
  2. Design a site plan for a 100 acre fitness retreat
  3. Reconstruct Apollo control panels from technical PDFs
  4. Simulate the supply chain for World Cup jersey sales based on match outcomes
  5. Show the effects of solar flares on aurora

Fable 5 is now available on Hyperagent.

Video

— https://nitter.net/hyperagentapp/status/2064396004032463157#m