GPT Image 1.5 is cheaper: $0.0090 vs $0.034 per image at 1024×1024 on each model's cheapest path — 3.8× less. For 1,000 images (1024×1024): $9.00 vs $34.00. Stamped 2026-09-07. Gemini 3.1 Flash Image (Nano Banana 2)'s premium may buy quality — this index measures cost only.
GPT Image 1.5 vs Gemini 3.1 Flash Image (Nano Banana 2): price
GPT Image 1.5
$0.0090–$0.133 per image at 1024×1024
Cheapest: $0.0090 via OpenAI (Low quality) (verified)
Gemini 3.1 Flash Image (Nano Banana 2)
$0.034–$0.067 per image at 1024×1024
Cheapest: $0.034 via Google (Gemini API / Vertex) (Batch API) (verified)
How much does GPT Image 1.5 cost?
| Provider | Price /image (1024²) | Provider's own unit | vs official | Status | Source |
|---|---|---|---|---|---|
| OpenAI · Low qualitycheapest | $0.0090 | $0.009 per image (low quality, 1024×1024)USD per image by quality tier | — | Verified2026-09-07 | source |
| OpenAI · Medium quality | $0.034 | $0.034 per image (medium quality, 1024×1024)USD per image by quality tier | — | Verified2026-09-07 | source |
| OpenAI · High quality | $0.133 | $0.133 per image (high quality, 1024×1024)USD per image by quality tier | — | Verified2026-09-07 | source |
| fal.ai | $0.0090 | $0.009 per imageUSD per image | 0% | Derived2026-09-07 | source |
How these numbers were computed
- fal.ai: fal.ai per-image rate captured in the FairStack operational cost audit, 2026-03-23 (price-audit-full.json); endpoint gpt-image-1.5-t2i-fal.
How much does Gemini 3.1 Flash Image (Nano Banana 2) cost?
| Provider | Price /image (1024²) | Provider's own unit | vs official | Status | Source |
|---|---|---|---|---|---|
| Google (Gemini API / Vertex) | $0.067 | $60.00 per 1M output image tokens ≈ $0.067 per 1K imageUSD per 1M tokens | — | Verified2026-09-07 | source |
| Google (Gemini API / Vertex) · Batch APIcheapest | $0.034 | $30.00 per 1M output image tokens ≈ $0.034 per 1K imageUSD per 1M tokens | — | Verified2026-09-07 | source |
Frequently asked
Is GPT Image 1.5 cheaper than Gemini 3.1 Flash Image (Nano Banana 2)?
GPT Image 1.5 is cheaper: $0.0090 vs $0.034 per image at 1024×1024 on each model's cheapest path — 3.8× less. For 1,000 images (1024×1024): $9.00 vs $34.00. Stamped 2026-09-07. Gemini 3.1 Flash Image (Nano Banana 2)'s premium may buy quality — this index measures cost only.
What does 1,000 images (1024×1024) cost on each?
GPT Image 1.5: $9.00 (cheapest path). Gemini 3.1 Flash Image (Nano Banana 2): $34.00. Both computed from the normalized canonical rate; real invoices vary with resolution, minimum charges, and tiers.
Which is better quality?
This index measures cost, not quality. For quality benchmarks, see Artificial Analysis — a image model that costs more is not automatically better, and vice versa.
Prices normalized to per image at 1024×1024; per-clip, credit, and tier billing converted per themethodology. Quality comparison is out of scope — seeArtificial Analysis.