What is the difference between Flux 2 Pro and Flux 2 Flex?

Pro is the faster, more affordable tier at 5 cents per 1k image. Flex produces higher-fidelity output at 14 cents per 1k image. Both share the same API parameters and support text_to_image and remix_image endpoints through the custom:runapi provider.

What hardware does Flux 2 local inference require?

You do not need local hardware. Hermes Agent calls Flux 2 through the RunAPI API -- all GPU inference runs server-side. No VRAM requirements, no ComfyUI setup, no model downloads. The FP8 quantized local version needs 24GB+ VRAM, but the RunAPI endpoint removes that requirement entirely.

Does Flux 2 output resolution affect pricing?

Yes. Each variant bills per image with resolution-based pricing. For example, Flux 2 Pro costs 5 cents at 1k and 7 cents at 2k. Flux 2 Flex costs 14 cents at 1k and 24 cents at 2k. Check the RunAPI pricing page for current rates.

Do I need a separate provider config for Flux 2 image generation?

No. The custom:runapi provider you configured for chat already works for Flux 2 and all other RunAPI models. The same RUNAPI_API_KEY, base_url, and provider name handle LLM, image, video, and music requests.

How does Flux 2 compare to Flux Kontext on RunAPI?

Flux Kontext specializes in text-guided editing with a single input image and character consistency. Flux 2 focuses on text-to-image generation and multi-source remixing with selectable Pro/Flex quality tiers and 1k/2k resolution options. Both are by Black Forest Labs and share the same RunAPI key and billing.

How does Hermes Agent switch between Flux 2 Pro and Ultra tiers?

Set the model parameter to the Pro or Ultra slug in your request. Hermes Agent can dynamically select the tier based on task requirements — Pro for speed and cost, Ultra for maximum quality — through the same custom:runapi provider.

Can Hermes Agent chain Flux 2 with editing or upscaling models?

Yes. Hermes Agent can generate an image with Flux 2, refine it with Flux Kontext for targeted edits, and upscale with Topaz or Recraft — all within a single agent workflow through the custom:runapi provider.

HERMES + FLUX 2

Hermes Agent で Flux 2 を使う。

Black Forest Labs の Flux 2 は2つの品質層を備えています——Pro は1枚あたり5セントで高速生成を、Flex は14セントでより高い忠実度を実現します。どちらもテキスト→画像とマルチソース remix に対応し、解像度は 1k または 2k を選べます。Hermes Agent は custom:runapi プロバイダーで呼び出します——チャット用に設定したのと同じキーとベース URL です。

API キーを取得ドキュメントを読む

1つの APIキー · テキスト→画像 + remix エンドポイント · 1k / 2k 解像度

RunAPI を使って Hermes Agent から Flux 2 Pro で画像を生成します。

要件：
- Hermes Agent ですでに設定済みの custom:runapi プロバイダーを使用します
- https://runapi.ai/v1/text_to_image の RunAPI text_to_image エンドポイントを呼び出します
- model を "flux-2-pro-text-to-image" に設定します
- RUNAPI_API_KEY 環境変数が認可を提供します
- 任意で output_resolution を "1k" または "2k" に、aspect_ratio で寸法を制御します
- レスポンスは非同期です——タスクが完了するまでタスクステータスエンドポイントをポーリングし、画像 URL を取得します

curl -X POST https://runapi.ai/v1/text_to_image \
  -H "Authorization: Bearer $RUNAPI_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "flux-2-pro-text-to-image",
    "prompt": "a ceramic vase with dried flowers on a linen tablecloth, natural window light, 35mm film grain",
    "aspect_ratio": "3:4",
    "output_resolution": "2k"
  }'

{
  "task_id": "tsk_abc123",
  "status": "pending",
  "model": "flux-2-pro-text-to-image"
}

curlコマンドをコピーしてテスト flux-2

仕組み

Hermes Agent で Flux 2 を使う3ステップ

Configure RunAPI

Set the RUNAPI_API_KEY environment variable. If you already added RunAPI as a custom:runapi provider in Hermes Agent for chat, the same key and base_url work for Flux 2 image generation — no extra configuration needed.

export RUNAPI_API_KEY=runapi_xxx

Call Flux 2

Send a POST request to the text_to_image endpoint with model set to flux-2-pro-text-to-image. Include a prompt, and optionally set aspect_ratio (1:1, 4:3, 16:9, etc.) and output_resolution (1k or 2k). For multi-source remixing, use the remix_image endpoint with source_image_urls instead.

text_to_image

Get the result

The endpoint returns a task ID. Poll the task status endpoint until the status changes to completed, then retrieve the generated image URL from the response. RunAPI SDKs and the CLI handle polling automatically.

task_id: tsk_abc123

パラメータ

Flux 2 API パラメータ

パラメータ	型	説明
`model`	`string`	Required. flux-2-pro-text-to-image, flux-2-flex-text-to-image, flux-2-pro-remix-image, or flux-2-flex-remix-image.
`prompt`	`string`	Text description of the image to generate.
`aspect_ratio`	`string`	Optional. Output aspect ratio: 1:1, 4:3, 3:4, 16:9, 9:16, 3:2, or 2:3. Remix endpoints also accept auto.
`output_resolution`	`string`	Optional. 1k (default) or 2k. Higher resolution costs more per image.
`source_image_urls`	`array`	Required for remix_image. Array of source image URLs to blend or transform.
`callback_url`	`string`	Optional. Webhook URL for async completion notification.

Hermes AgentのFlux 2とは？

Black Forest LabsのFlux 2は高い素材忠実度のフォトリアルな画像生成を提供します。Hermes AgentはRunAPI custom provider経由でFlux 2を呼び出し、大規模な反復制作を実現します——同じプロンプトから手動ファインチューニングなしにブランド一貫性のある数十のバリアントを生成します。