Add image-gen module: Spring AI ImageModel options on the wire, a moderation gate, and safe storage of generated images in MinIO (sniffed content type, byte and pixel caps, server-chosen keys, capped URL fetcher); per-provider cost table dated 2026-10-28. ImageModel and ModerationModel are hand-written fakes; MinIO is real via Testcontainers; no image provider called.

Co-Authored-By: Claude Sonnet 5.5 <[email protected]> Claude-Session: https://claude.ai/code/session_017ic4b7rnC7jppGGdHGESvy
2026-10-28 18:36:40 +00:00
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+# Per-image prices as read from provider pages on 2026-10-28 (USD)
+
+OpenAI, output only, text prompt tokens extra
+model quality               1024x1024  1024x1536  1536x1024
+gpt-image-2 low                $0.006     $0.005     $0.005
+gpt-image-2 medium             $0.053     $0.041     $0.041
+gpt-image-2 high               $0.211     $0.165     $0.165
+gpt-image-1.5 low              $0.009     $0.013     $0.013
+gpt-image-1.5 medium           $0.034      $0.05      $0.05
+gpt-image-1.5 high             $0.133       $0.2       $0.2
+gpt-image-1-mini low           $0.005     $0.006     $0.006
+gpt-image-1-mini medium        $0.011     $0.015     $0.015
+gpt-image-1-mini high          $0.036     $0.052     $0.052
+
+Google Gemini image models, standard tier
+gemini-3.1-flash-lite-image 1K     $0.0336
+gemini-3.1-flash-image 0.5K        $0.045
+gemini-3.1-flash-image 1K          $0.067
+gemini-3.1-flash-image 2K          $0.101
+gemini-3.1-flash-image 4K          $0.151
+gemini-3-pro-image 1K-2K           $0.134
+gemini-3-pro-image 4K              $0.24
+gemini-2.5-flash-image 1K          $0.039
+
+Stability AI, 1 credit = $0.01
+Stable Image Ultra                  8.0 credits = $0.080
+Stable Diffusion 3.5 Large          6.5 credits = $0.065
+Stable Diffusion 3.5 Large Turbo    4.0 credits = $0.040
+Stable Diffusion 3.5 Medium         3.5 credits = $0.035
+Stable Image Core                   3.0 credits = $0.030
+Stable Diffusion 3.5 Flash          2.5 credits = $0.025
+
+1,000 images a day for 30 days = 30,000 images
+gpt-image-2 medium 1024x1024       $1,590
+gpt-image-1-mini medium 1024x1024  $330
+gemini-3.1-flash-image 1K          $2,010
+Stable Image Core                  $900
+Retrying every refusal once doubles the bill for those requests; the moderation call is separate.