FLUX 3 Image API Pricing Starts at $0.041

TL;DR

FLUX 3 Image pricing ranges from $0.041 for 768x768 outputs to $0.607 for native 4K requests. Black Forest Labs does not offer a free tier. Developers configure layout adjustments using normalized 0-1000 coordinate grid bounding boxes, but generations remain non-deterministic due to missing seed parameters.

FLUX 3 API Costs

Black Forest Labs released FLUX 3 Image on October 1, 2026. The API bills per request based on output pixel count. Launch promotional pricing offers 50% off until October 8, 2026.

Base 768x768 resolution runs $0.041 per image. Target outputs around 1 megapixel cost $0.048. High-definition 2K rendering costs $0.10. Native 4K output costs $0.607 per API call.

Black Forest Labs provides no free tier. Every API request incurs a charge tied to its resolution tier.

Resolution Tiers

The model exposes four standard resolution tiers: 768x768, 1K, 2K, and native 4K.

You can set custom aspect ratios inside each tier. Total pixel limits determine billing rates regardless of requested width or height dimensions.

High-resolution calls increase generation latency and computational expense substantially.

Bounding Box Control

FLUX 3 Image handles layout manipulation through a normalized 0-1000 coordinate grid.

You can place, move, remove, or re-describe specific objects while preserving the rest of the image unchanged.

{
  "prompt": "A modern metallic water bottle on a wooden table",
  "bounding_boxes": [
    {
      "box": [200, 300, 800, 700],
      "label": "metallic water bottle"
    }
  ],
  "width": 1024,
  "height": 1024
}

Generations are not deterministic. The API lacks seed support, making exact run-to-run output replication impossible. The system also omits negative prompt parameters entirely.

Competitor Benchmarks

Data published by Black Forest Labs details joint video and audio preference evaluations for the broader FLUX 3 family.

In those video tests, FLUX 3 reached a 77% preference score against Runway Gen-4.5. It scored a 93% preference rating against Luma Ray 3.2.

The model succeeds FLUX.2 and features integrated layout control via bounding box coordinates. It also supports native high-resolution synthesis up to 4K.

Editing With Reference Images

The API processes image generation and image editing simultaneously using reference inputs.

Endpoints accept up to roughly 10 reference images per API call. You can run edits via third-party providers like fal.ai and Replicate under blackforestlabs/flux-3/edit-image, or call early access BFL API endpoints directly.

Multi-reference requests run alongside normal text prompts. Combining structural bounding boxes with image references lets you target localized regions for editing.

Production Readiness

You can access FLUX 3 Image through the BFL API early access program, the web BFL Playground, or third-party hosts.

Missing seed controls limit sequential workflows. You cannot lock seeds across calls to generate matching animation frames or identical background variants.

High-resolution outputs add significant latency. Systems calling native 2K or 4K endpoints need long client timeout thresholds to prevent dropped requests.