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cele mai bune modele AI open source

Flex.1 Alpha by Ostris: the open, fine-tunable Flux cousin

Flex.1 Alpha is an 8B Apache-licensed model derived from Flux Schnell with a guidance embedder. Learn how its guidance differs, the settings that work, prompting, and why it is a favorite base for training.
Subiect: Modele
De Captain
Publicat 2026-09-30
Această pagină nu a fost încă tradusă, așa că este afișată în engleză.

Prezentare generală

Flex.1 Alpha by Ostris is an 8-billion-parameter rectified-flow model built from
FLUX.1
Schnell, with the distillation removed and a trainable guidance embedder added. It is released under Apache 2.0, which makes it one of the few Flux-class models that can be fine-tuned and used commercially without restriction.
Prompting is like Flux: natural sentences, no
negative prompt
by default. Because the guidance embedder is separate, you can bypass it and use true classifier-free guidance when you want a negative prompt.

Referință

Nume
Tip
Ce este
Prompt
text
Natural sentences as with Flux.
Guidance
3-4
3.5 default with the embedder. Set to 1 and use
CFG
3-5 if you bypass it.
Steps
25-50
It likes a few more steps than Dev; 30 is a good baseline.
Resolution
1 MP
1024x1024 and standard ratios.
LoRAs
Flex / Dev
Flex
LoRAs
are ideal; many Dev LoRAs work at reduced strength.
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BitVector Prism este cel mai simplu mod de a începe: alege un model, tastează un prompt și generează într-o aplicație web curată, fără nimic de configurat. BitVector este disponibil și pe Discord și pe web (SpyGlass).

Pas cu pas

  1. Prompt in sentences and set guidance 3.5, steps 30.
  2. Compare with the same seed at 50 steps; fine detail improves more than on Dev.
  3. If you need to exclude something, bypass the guidance embedder and use CFG 4 with a negative prompt.
  4. Add a Flex-trained LoRA at 0.8-1.0.
  5. For training, use it as a base: its open license and un-distilled weights are the reason it exists.

Exemple

Illustration

A flat vector-style illustration of a lighthouse keeper's cottage at night, warm windows, stars, limited palette of navy, mustard and cream.

Photograph

A photograph of a mechanic's hands adjusting a bicycle derailleur, grease, soft workshop light, 50mm, shallow focus.

Creative idea: CFG with a negative

A busy farmers market in watercolor, loose washes, lots of white paper. Negative: photo, 3d render, text
Guidance embedder bypassed, CFG 4

Sfaturi

  • Flex keeps more of Schnell's bright, graphic look than Dev; it suits illustration and design.
  • Text rendering is decent but below Dev; keep words short.
  • Lower guidance (2.5) gives surprisingly natural photographs.
  • It is smaller than Dev and runs faster on the same hardware.

Depanare

Output is washed out

De ce se întâmplă
Guidance too low with the embedder active.

Cum se repară
Raise guidance to 3.5-4 or add stronger light and color words.

Dev LoRA causes artifacts

De ce se întâmplă
Partial compatibility.

Cum se repară
Lower the LoRA to 0.5 or use a LoRA trained on Flex.

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Întrebări

Is it commercially usable?

Yes, Apache 2.0.

Is it the same quality as Flux Dev?

Close in many prompts, a little behind in text and fine portraits, ahead in licensing and trainability.

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