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Models / Google

Imagen 4 Fast

Deprecated

Cheapest Imagen 4 tier, billed per image ($0.02 per image, paid tier only), so token price fields are N/A. Covered by the same 2026-08-17 shutdown banner; the deprecations table names gemini-3.1-flash-image as the replacement while the pricing banner says Gemini 2.5 Flash Image. Google publishes shutdown dates as "the earliest possible dates on which a model might be retired"; already-shut-down models are marked with a grey row on the deprecations page. REVERTED 2026-08-31: the retirement filed earlier today is withdrawn. It rested on the rate row disappearing from the PRICING page, which is an inference; the deprecations page carries a first-party, per-row marker for "already shut down" (the legend: "Already-shutdown models are indicated with gray backgrounds", a literal class="row-gray" on the <tr>) and this row is NOT gray. Google therefore still asserts the endpoint is running. Gray beats a missing rate row; status returns to deprecated and the changelog entry is removed as our own error (LEARNINGS #48).

Imagen 4 Fast by Google is tracked live in our LLM catalog. It is deprecated, shutting down 17 Aug 2026; the recommended replacement is Gemini 3.1 Flash Image (Nano Banana 2).

Last verified: 26 Sep 2026 · sourced from official provider documentation

Retired on 17 Aug 2026

Lifecycle warning

This model is deprecated. Recommended migration: Gemini 3.1 Flash Image (Nano Banana 2).

Read the Imagen 4 Fast migration guide → replacement & cheapest alternatives

Provider
Google
Status
Deprecated
Input price
—
Output price
—
Cached input
—
Blended price
—
Context window
—
Max output
—
Modality
text-in, image-out
Open weights
No — API only
Knowledge cutoff
—
Released
24 Jun 2025
API string
imagen-4.0-fast-generate-001

Source: Google official documentation ↗

See also

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FAQ

Imagen 4 Fast — questions & answers

Is Imagen 4 Fast being deprecated or retired?

Imagen 4 Fast is deprecated. Its scheduled shutdown date is 17 Aug 2026. The recommended migration is Gemini 3.1 Flash Image (Nano Banana 2).

Does Imagen 4 Fast support image or vision input?

Our catalog lists Imagen 4 Fast's modalities as text-in, image-out; image/vision input is not among them.

Can I self-host Imagen 4 Fast?

No — Imagen 4 Fast is proprietary. Its weights are not publicly released, so it is available only through Google's API (or hosted partners), not for self-hosting.

What is the API model string for Imagen 4 Fast?

The API model identifier for Imagen 4 Fast is "imagen-4.0-fast-generate-001" when calling Google's API.