FLUX vs Midjourney: which image model to use through an API

import os
import time
import uuid

import requests

API = "https://api.revana.si/v1"
HEADERS = {"Authorization": f"Bearer {os.environ['REVANA_API_KEY']}"}
PROMPT = "A lighthouse on a cliff in a storm, waves breaking, dramatic light through the clouds."

# The same prompt on three models. Only the model id and its own settings change.
JOBS = {
    "midjourney-v7": {"quality": "relax"},
    "flux-2-pro": {"resolution": "1MP"},
    "flux-3-klein": {"resolution": "1K"},
}

started = {}
for model, settings in JOBS.items():
    # One Idempotency-Key per job, made once: resend with the same key after a timeout,
    # a 429 or a 5xx and you get the same job back, never a second charge.
    key = str(uuid.uuid4())
    resp = requests.post(f"{API}/generations", headers={**HEADERS, "Idempotency-Key": key}, json={
        "model": model,
        "input": {"prompt": PROMPT, "aspect_ratio": "16:9", **settings},
        "max_cost_usd": 0.1,  # your cap per job
    })
    resp.raise_for_status()
    started[model] = resp.json()["id"]

for model, gen_id in started.items():
    job = requests.get(f"{API}/generations/{gen_id}", headers=HEADERS).json()
    while job["status"] in ("queued", "running"):
        time.sleep(5)
        job = requests.get(f"{API}/generations/{gen_id}", headers=HEADERS).json()
    if job["status"] == "succeeded":
        print(model, job["output"]["urls"], job["cost_usd"])
    else:
        print(model, "failed (free):", job["error"])

export REVANA_API_KEY="sr_live_..."

# One Idempotency-Key per job, made once: resend with the same $KEY after a timeout, a 429 or a 5xx
KEY=$(uuidgen)

# 1. Submit the job (returns 202 with the generation id). max_cost_usd is your cap: the most it may cost.
curl https://api.revana.si/v1/generations \
  -H "Authorization: Bearer $REVANA_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: $KEY" \
  -d '{
    "model": "flux-2-pro",
    "input": {
      "prompt": "A lighthouse on a cliff in a storm, waves breaking, dramatic light through the clouds.",
      "resolution": "2MP",
      "aspect_ratio": "16:9"
    },
    "max_cost_usd": 0.1
  }'

# 2. Poll with the id from step 1 until status is "succeeded" or "failed".
#    A failed job is free; make a new KEY before you submit it again.
curl https://api.revana.si/v1/generations/gen_01JC4M2R8D \
  -H "Authorization: Bearer $REVANA_API_KEY"