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Bloom offers three image model tiers. Pro is the default; ask for another in plain language when you want it: 
Generate that on the standard model.
The tiers trade off quality, speed, and how strict the content filter is. Everything else is the same across all three — every aspect ratio, 2K and 4K (4K needs a paid plan), variants, references, edits, and resizes.
TierBest forQualityContent filterSpeed at 2K
Pro (default)Final, customer-facing workHighest — best at realism and graphics/textStrictest~60s (80–90s at 4K)
StandardFinal, customer-facing workNearly pro; slightly behind on graphics/textMore permissive~35–40s
FastDrafts and explorationLighter than standardMore permissive~30s

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Pro

The default and the highest quality. Best at realism and at rendering graphics and text cleanly, so it’s the right pick for final, customer-facing creative. Two tradeoffs: it’s the slowest — around 60 seconds at 2K, and 80–90 seconds at 4K — and its content filter is the strictest of the three, so it occasionally refuses subjects the other tiers allow.

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Standard

Nearly as good as pro on realism, a little behind on graphics and text. It’s much faster — around 35–40 seconds at 2K — and its content filter is more permissive than pro’s. A strong everyday choice when you want quality without pro’s wait or strictness.

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Fast

The quickest and lightest tier, best for rapid exploration and drafts when you don’t need top fidelity. Quality sits below standard, and like standard, its content filter is more permissive than pro’s.

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Choosing a tier

  • Reach for pro when the image ships to customers and quality matters most.
  • Use standard for most day-to-day generation — close to pro, noticeably faster.
  • Use fast to explore directions quickly before committing.
If pro refuses a subject, standard or fast will often allow it — switching tiers is one of the first things to try when a generation is blocked.