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Google DeepMind

Imagen 4 Fast

VS
OpenAI

GPT Image 1.5

✍️ Analysis by:the whichllmmodel Editorial Team|📅 Updated: June 2026

Decision Recommendation

⚖️ Editorial Verdict: This comparison represents a classic price-to-performance trade-off. Imagen 4 Fast is the highly cost-efficient option, being 1.7x cheaper per generation. However, GPT Image 1.5 operates at a faster speed tier (fast). Choose Imagen 4 Fast for high-volume batches, and GPT Image 1.5 for interactive, real-time application pipelines.

Model Specs

Imagen 4 Fast

Pricing & Speed

Cost per Generation1.7x cheaper
$20.00per 1,000 images
Speed Tier
real-time
Max Resolution2K

Model Strengths

✨ Real-Time Speed✨ High-Volume Gen
Model Specs

GPT Image 1.5

Pricing & Speed

Cost per Generation
$34.00per 1,000 images
Speed TierFaster
fast
Max Resolution1.5K

Model Strengths

✨ Text Rendering✨ In-Context Editing✨ Prompt Adherence✨ Character Consistency
Read our data collection methodology

Frequently Asked Questions

Imagen 4 Fast is cheaper, costing $0.0200 per image generation compared to GPT Image 1.5 at $0.0340 per image.

GPT Image 1.5 is faster, operating in the fast speed tier compared to Imagen 4 Fast which is in the real-time speed tier.

Imagen 4 Fast specializes in: real time, high volume. GPT Image 1.5 specializes in: text rendering, in context-editing, prompt adherence, character consistency.

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