Best image generation API

Choose Replicate for fixed per-image FLUX.1 schnell billing at $3 per 1,000 images, fal.ai for megapixel and step controls, or Black Forest Labs for direct FLUX1.1 pro access at $40 per 1,000 images.

Updated · 6 sources · Methodology

NeedPickWhy
Direct FLUX1.1 pro developer accessBlack Forest LabsDirect FLUX1.1 pro access costs $40 for 1,000 images in this example, without an added Gateway account.46
Per-image billingReplicateThis endpoint bills per 1 output image.1
Megapixel billing incrementsfal.aiEach image rounds up to a whole 1 MP billing unit.2

Performance

ProviderAPI and model IDPublished timing and execution
Replicate1FLUX.1 schnell0.6 s in one published prediction, vendor-reported 20255
fal.ai2FLUX.1 schnell<1 s generation claim, vendor-reported 20262
Vercel AI Gateway3bfl/flux-pro-1.1Gateway route bfl/flux-pro-1.1; upstream timing is not Gateway latency3
Black Forest Labs4FLUX1.1 proDirect FLUX1.1 pro API; asynchronous result retrieval46

Prices and request cost

ProviderPrice / image up to 1 MP1,000-image cost
Replicate1$0.003$3
fal.ai2$0.003$3
Vercel AI Gateway3$0.04$40
Black Forest Labs4$0.04$40
Cost example: 1,000 images up to 1 MP
Replicate$3
fal.ai$3
Vercel AI Gateway$40
Black Forest Labs$40

Options, strengths and limitations

  1. Replicate

    Replicate is the per-image FLUX.1 schnell option for prediction-based applications; compare it with fal.ai’s queue API.

    Price / image up to 1 MP
    $0.003
    Example quantity
    1000
    Example total
    $3

    Strengths

    • FLUX.1 schnell uses 1–4 inference steps.1

    Limitations

    • The $0.003 rate applies to schnell, not FLUX1.1 pro; private deployments have different hardware billing.1

    Sources:1

  2. fal.ai

    Fal.ai exposes FLUX.1 schnell through a queue API with image-size and inference-step controls.

    Price / image up to 1 MP
    $0.003
    Example quantity
    1000
    Example total
    $3

    Strengths

    • The API exposes 1–4 steps with a default of 4.2

    Limitations

    • Billing rounds each output up to the next megapixel; larger images can cost more than $0.003.2

    Sources:2

  3. Vercel AI Gateway

    Vercel AI Gateway routes FLUX1.1 pro through model ID bfl/flux-pro-1.1 at $0.04/image.

    Price / image up to 1 MP
    $0.04
    Example quantity
    1000
    Example total
    $40

    Strengths

    • Vercel AI Gateway lists bfl/flux-pro-1.1 at $0.04/image.3

    Limitations

    • The Gateway route is not a direct Black Forest Labs endpoint; the listed price does not measure routing latency.3

    Sources:3

  4. Black Forest Labs

    Black Forest Labs provides direct access to its FLUX1.1 pro model, avoiding a separate inference reseller.

    Price / image up to 1 MP
    $0.04
    Example quantity
    1000
    Example total
    $40

    Strengths

    • Direct access to the FLUX1.1 pro developer API avoids an additional Gateway account.46

    Limitations

    • FLUX1.1 pro is more expensive per image than the schnell entries in this shortlist.4

    Sources:4

Methodology and sources

The shortlist compares two schnell APIs with direct and Gateway access to FLUX1.1 pro. The cost example is 1,000 images up to 1 MP; fal.ai rounds each image up to a whole MP. Replicate’s single 2025 prediction is not a latency distribution, and fal.ai’s 2026 sub-second claim is not a matched benchmark. The FLUX1.1 pro rows use a different model; no Gateway timing is inferred from a direct endpoint. Costs exclude credits and retries; speed and quality are not ranked across these evidence types.

  1. Replicate · FLUX.1 schnell specifications and pricing
  2. fal.ai · FLUX.1 schnell specifications and pricing
  3. Vercel AI Gateway · bfl/flux-pro-1.1 specifications and pricing
  4. Black Forest Labs · FLUX1.1 pro specifications and pricing
  5. Replicate · published FLUX.1 schnell prediction
  6. Black Forest Labs · asynchronous API execution

Develop image prompts with Novita LLMs

Use Novita Model APIs for prompt drafting and text orchestration. The image endpoints and prices compared above are supplied by the listed providers.

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