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Models/Black Forest Labs/Flux 2 Flex
Black Forest Labsimage1 route

Flux 2 Flex

Black Forest Labs's Flux 2 Flex: text to image and image editing, up to 4MP.

The lowest listed Flux 2 Flex price we found at 1MP, 2MP, 3MP and 4MP (checked 2026-10-26). See the other APIs

flux-2-flexGet API key

Pricing per image

SizePer image
1MP$0.05lowest5 credits
2MP$0.1010 credits
3MP$0.1515 credits
4MP$0.2020 credits

Billed in credits per image (100 credits = $1, rounded up to a whole credit). Charged once, only for the route that succeeds. Failed attempts cost $0.00.

Request

# 1. Submit a generation and keep its id (a refusal prints {"error": {"message": ...}})
RESP=$(curl -s https://api.revana.si/v1/generations \
  -H "Authorization: Bearer $REVANA_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "flux-2-flex",
    "input": {
      "prompt": "A product photo of a ceramic coffee cup on a linen tablecloth, soft morning light",
      "resolution": "1MP",
      "aspect_ratio": "16:9"
    }
  }')
echo "$RESP"
ID=$(echo "$RESP" | jq -r .id)

# 2. Poll it until status is "succeeded" or "failed" (a failed one has error.message)
curl -s https://api.revana.si/v1/generations/$ID \
  -H "Authorization: Bearer $REVANA_API_KEY"

# 3. Download the file once it has succeeded
curl -L https://api.revana.si/v1/generations/$ID/content \
  -H "Authorization: Bearer $REVANA_API_KEY" \
  -o out.png

Set REVANA_API_KEY to your key. Full reference in the quickstart.

Options

Tasks
Text to imageImage to image
Resolutions
1MP2MP3MP4MP
Aspect ratios
auto1:116:99:164:33:43:22:321:99:21
Input images
Up to 8
Billing unit
per image
Model id
flux-2-flex

1 route

One route today. If it fails you are not charged.

About the Flux 2 Flex API

How much does the Flux 2 Flex API cost?

Flux 2 Flex costs from $0.05 per image on Revana (1MP: $0.05; 2MP: $0.10; 3MP: $0.15; 4MP: $0.20). You pay in prepaid credits, 100 credits to the dollar, with no subscription or monthly minimum. A generation that fails costs nothing.

What is the cheapest Flux 2 Flex API?

Revana, at $0.05 an image at 1MP, $0.10 an image at 2MP, $0.15 an image at 3MP and $0.20 an image at 4MP: the lowest listed Flux 2 Flex price we found, below every other API we checked (checked 2026-10-26). Every price is compared at https://revana.si/blog/cheapest-ai-image-generation-api.

How do I call Flux 2 Flex from code?

Send POST https://api.revana.si/v1/generations with {"model": "flux-2-flex", "input": {...}} and your Revana API key as a Bearer token, poll GET /v1/generations/{id} until it succeeds, then download GET /v1/generations/{id}/content. Every model on Revana takes the same request shape.

What happens if a Flux 2 Flex generation fails?

You are charged once, only for the route that delivers. A failed generation costs $0.00.

What can Flux 2 Flex do on Revana?

Flux 2 Flex supports text to image and image to image, resolutions 1MP, 2MP, 3MP, 4MP, aspect ratios auto, 1:1, 16:9, 9:16, 4:3, 3:4, 3:2, 2:3, 21:9, 9:21 and up to 8 input images. A value it does not offer is refused with 422 before anything is charged.

Can my AI agent use Flux 2 Flex?

Yes. Connect the Revana MCP server (https://revana.si/api/mcp) to Claude, ChatGPT, Cursor or Codex, or have the agent call the REST API. The agent can list models, get a free quote and generate on your credits.

Flux 2 Flex price at other APIs (checked 2026-10-26)

Per output image at each resolution. Input tokens and reference images, where a seller bills them, and card and top-up fees are not included.

API1MP2MP3MP4MP
Revana$0.05$0.10$0.15$0.20
Replicate$0.06$0.12$0.18$0.24

Lowest listed price per image: 1MP Revana ($0.05); 2MP Revana ($0.10); 3MP Revana ($0.15); 4MP Revana ($0.20).

Full comparison and sources: /blog/cheapest-ai-image-generation-api (data: /data/market-prices.json)

Guides

Compare with similar models

Also as markdown for agents. Every model and price: models.json.