CometAPI vs Kie.ai: Full Feature & Pricing Comparison

TL;DR Verdict

• CometAPI is the stronger choice for developers who need Midjourney API access, broad LLM coverage (500+ models), and transparent per-model pricing—all under one API key.
• Kie.ai is a capable creative media platform covering video, image, and music generation (including Suno), with a clean async API. It suits teams focused primarily on media generation pipelines.
• The single biggest differentiator in 2026: Kie.ai has removed Midjourney from its model library. CometAPI still provides full Midjourney API access across Relax, Fast, and Turbo modes.
• For teams building products that require both LLM reasoning and multimodal generation under one contract, CometAPI's unified model library has no equivalent on Kie.ai.

Side-by-Side Feature Comparison

Pricing Comparison: Midjourney & Image Generation

This is the sharpest concrete difference between the two platforms.

CometAPI Midjourney Pricing (public, per task)

All prices are per task. CometAPI publishes this table publicly at cometapi.com/models/midjourney—no account required to check.

Kie.ai Midjourney Pricing

Not applicable. Midjourney has been removed from Kie.ai's model library. For teams who built workflows around Kie.ai's Midjourney access, CometAPI is the most direct migration path.

Image Generation (non-Midjourney)

Both platforms support Flux and GPT Image 2. CometAPI additionally provides gpt-image-1 (low/medium/high quality tiers, from $0.009/image) and legacy DALL-E 3 access ($0.016/image) — notable because OpenAI shut down the DALL-E 3 API on May 12, 2026. FLUX 2 MAX at $0.008/image is the lowest-cost option on CometAPI for high-volume image generation. Kie.ai covers Flux Kontext, GPT Image 2, Qwen Image 2.0, Seedream, and Ideogram, but pricing requires login to view.

API Structure: A Key Technical Difference

This is an important practical consideration for developers.

CometAPI uses an OpenAI-compatible API:

from openai import OpenAI

client = OpenAI(
    base_url="https://api.cometapi.com/v1",
    api_key="YOUR_COMETAPI_KEY"
)

# Call any of 500+ models—LLM or image—with the same client
response = client.chat.completions.create(
    model="gpt-5.5",
    messages=[{"role": "user", "content": "Describe this product in 3 sentences."}]
)
print(response.choices[0].message.content)

If your codebase already uses the OpenAI SDK, switching to CometAPI is a two-line change: update base_url and api_key. No new SDK to install, no structural refactor.

Kie.ai uses a custom async REST API:

// Step 1: Submit task
const res = await fetch("https://api.kie.ai/<endpoint>", {
  method: "POST",
  headers: {
    "Authorization": "Bearer YOUR_KIE_KEY",
    "Content-Type": "application/json"
  },
  body: JSON.stringify({ prompt: "a futuristic cityscape at dusk" })
});
const { task_id } = await res.json();

// Step 2: Poll for result (or set up webhook)
// A 200 OK on submission only confirms task creation, not completion

Kie.ai's async model is well-suited for media generation pipelines that naturally involve queuing. However, it requires you to build or adopt a polling/webhook layer that OpenAI-style synchronous clients don't need for LLM calls.

When to Choose CometAPI

Midjourney API access

CometAPI remains one of the few platforms providing reliable Midjourney API access in 2026, covering all core actions: imagine, variation, upscale, inpaint, blend, describe, and video. Kie.ai removed this capability entirely.

LLM + multimodal in one contract

If your application calls both GPT/Claude for text and Midjourney/Kling/Runway for images or video, CometAPI handles all of it through a single API key, a single invoice, and a single OpenAI-compatible client. You don't need to maintain separate API relationships for different modalities.

Transparent pricing without an account

CometAPI publishes its complete per-model price list publicly. You can compare costs, estimate monthly spend, and benchmark before signing up. Kie.ai requires login to see any pricing detail.

Ecosystem compatibility

CometAPI integrates directly with LiteLLM, FlowiseAI, Dify, and other open-source frameworks. If your stack uses any of these tools, CometAPI works as a drop-in provider.

Volume discounts with a single contract

CometAPI offers 20% off official provider rates across most models, with additional volume tiers for higher monthly usage. A single contract covers the full 500+ model catalog.

Migrating from Kie.ai to CometAPI

If you previously used Kie.ai for image generation and are looking to migrate, the process is straightforward on the CometAPI side.

For LLM calls (OpenAI-compatible swap)

from openai import OpenAI

# Before: any OpenAI-compatible provider
# client = OpenAI(base_url="https://api.YOUR_PREVIOUS_PROVIDER.com/v1", api_key="OLD_KEY")

# After: CometAPI (change two values only)
client = OpenAI(
    base_url="https://api.cometapi.com/v1",
    api_key="YOUR_COMETAPI_KEY"
)

response = client.chat.completions.create(
    model="claude-sonnet-4-6",
    messages=[{"role": "user", "content": "Summarize this document."}]
)
print(response.choices[0].message.content)

For Midjourney image generation

import requests

# Step 1: Submit imagine task
response = requests.post(
    "https://api.cometapi.com/mj-fast/mj/submit/imagine",
    headers={
        "Authorization": "Bearer YOUR_COMETAPI_KEY",
        "Content-Type": "application/json"
    },
    json={
        "prompt": "a futuristic cityscape at dusk, cinematic lighting --ar 16:9 --v 7"
    }
)
task = response.json()
task_id = task["result"]

# Step 2: Poll for result
result = requests.get(
    f"https://api.cometapi.com/mj/task/{task_id}/fetch",
    headers={"Authorization": "Bearer YOUR_COMETAPI_KEY"}
)
print(result.json())  # Contains image URLs when status = SUCCESS

Mode selection: Replace mj-fast with mj-turbo for ~3x faster generation ($0.168/task) or use the default path for Relax mode.

FAQ

Is CometAPI a direct Kie.ai alternative?

Yes, for most use cases. CometAPI covers the image generation, video generation, and LLM capabilities that Kie.ai offers, and adds Midjourney API access that Kie.ai removed. The main gap is Suno music generation, which Kie.ai supports and CometAPI does not.

Does CometAPI have Midjourney API access in 2026?

Yes. CometAPI provides Midjourney API access through /mj/submit/imagine and related endpoints, supporting all major actions: imagine, variation, upscale, inpaint, blend, pan, describe, and video. Three speed modes are available: Relax, Fast ($0.056/task), and Turbo ($0.168/task).

Why did Kie.ai remove Midjourney?

Midjourney does not offer an official public API. Third-party platforms have historically provided access through account-relay systems, which Midjourney has progressively restricted. Kie.ai's removal reflects this ongoing enforcement. CometAPI currently maintains access, though this may change based on Midjourney's policies.

Can I use the OpenAI Python SDK with CometAPI?

Yes. CometAPI is fully OpenAI-compatible. Set base_url="https://api.cometapi.com/v1" and your CometAPI key, and all standard OpenAI SDK calls work without modification. Kie.ai's API is not OpenAI-compatible.

How does CometAPI pricing compare to Kie.ai?

CometAPI publishes its full price list publicly (no login required), with a stated 20% discount from official provider rates. Kie.ai claims 30–50% discounts but requires login to view any specific pricing. For a direct comparison, check cometapi.com/models before creating an account on either platform.

Is there a free trial for CometAPI?

Yes. CometAPI provides free API tokens for new users with no credit card required. This allows you to test Midjourney, image generation, and LLM endpoints before committing to a paid plan.