Migrate off Imagen 4 Ultra
DeprecatedImagen 4 Ultra is deprecated and shuts down on 17 Aug 2026. Google's official replacement is Gemini 3.1 Flash Image (Nano Banana 2). The cheapest comparable model we track is Grok Build 0.1 (xAI) at $1.25 per 1M tokens blended.
Last verified: 26 Sep 2026 · sourced from official provider documentation
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Imagen 4 Ultra → Gemini 3.1 Flash Image (Nano Banana 2)
| Spec | Imagen 4 Ultra | Gemini 3.1 Flash Image (Nano Banana 2) |
|---|---|---|
| Status | Deprecated | GA |
| Blended price /1M | — | $15.38 |
| Input / output /1M | — | $0.5 / $60 |
| Context window | — | — |
| Max output | — | — |
| Modality | text-in, image-out | text, image, image-out |
| Knowledge cutoff | — | — |
API string was imagen-4.0-ultra-generate-001 → switch to gemini-3.1-flash-image. See Gemini 3.1 Flash Image (Nano Banana 2)'s full spec sheet →
Budget-friendly replacements for Imagen 4 Ultra
Generally-available models that match Imagen 4 Ultra's capabilities, ranked by blended price. Every number is computed from official catalog prices.
| Model | Blended /1M | Input / output | Context |
|---|---|---|---|
| Grok Build 0.1 xAI | $1.25 | $1 / $2 | 256K |
| Grok 4.3 xAI | $1.56 | $1.25 / $2.50 | 1M |
| Grok 4.20 (0309) Reasoning xAI | $1.56 | $1.25 / $2.50 | 1M |
Migrating off Imagen 4 Ultra
What replaces Imagen 4 Ultra?
Google's recommended migration for Imagen 4 Ultra is Gemini 3.1 Flash Image (Nano Banana 2). The cheapest comparable model in our catalog is Grok Build 0.1 (xAI) at $1.25/1M blended.
When is Imagen 4 Ultra shut down?
Imagen 4 Ultra is deprecated and scheduled to shut down on 17 Aug 2026. Migrate before that date to avoid a 404.
What is the cheapest alternative to Imagen 4 Ultra?
Grok Build 0.1 (xAI) is the cheapest generally-available alternative we track that matches Imagen 4 Ultra's capabilities, at $1 per 1M input and $2 per 1M output tokens ($1.25/1M blended).
Browse the full deprecation watch → or see Imagen 4 Ultra's full spec sheet →
Get a heads-up before your model is retired
New models, price cuts, and deprecations — a short email when something actually changes. No spam, unsubscribe anytime.
The last few changes we caught — this is what lands in your inbox:
- DeprecatingGoogle re-pointed the Gemini 2.5 TTS migration path past the 3.1 preview and onto the new GA 3.8 TTS models
- New modelGemini 3.8 Flash TTS is GA - a flagship text-to-speech model at under half the audio rate of the preview it replaces, on a two-column price schedule
- New modelGemini 3.8 Flash-Lite TTS is GA - Google's cost-efficient TTS, which Google says was built to replace Gemini 3.1 Flash TTS
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