GPT Image 1.5 vs Nano Banana Pro (2026): Which Wins
TL;DR
GPT Image 1.5 edges ahead of Nano Banana Pro in the current public Sonnet leaderboard. GPT Image 1.5 scores 4.015 at $0.133/image. Nano Banana Pro scores 3.959 at $0.138/image. The 0.056-point gap is small, but GPT Image 1.5 is ahead on both score and price.
Recommended Benchmarks
- Best Premium AI Image Generator 2026: Is Expensive Worth It?GPT Image 2 High leads premium-priced public image models at 4.16. GPT Image 2 Medium and Nano Banana 2 are the practical value picks above $0.05/image.
- Best AI Image Generator 2026: 18 Models RankedGPT Image 2 High leads our 18-model blind benchmark (4.16/5, 150 judgments per model). Full ranking, dimension winners, real costs, and where they all fail.
- Nano Banana vs Nano Banana Pro (2026): Which Is Better?Nano Banana Pro beats the original Nano Banana in the current Sonnet benchmark, 3.959 to 3.758, but costs over 3x more.
- GPT Image 2 vs Nano Banana Pro: Premium BenchmarkGPT Image 2 high beats Nano Banana Pro on the current Sonnet 4.6 benchmark, 4.16 to 3.96, with a 36/8/6 prompt split. GPT Image 2 medium also beats Nano Banana Pro at a much lower price.
Current Sonnet Comparison
The previous version of this comparison was based on the retired Gemini dataset. The current public leaderboard uses Claude Sonnet 4.6 across the 50-prompt image set, so the article now uses the same numbers as the leaderboard and Atlas.
| # | Model | Sonnet Score | Cost/Image | Tier |
|---|---|---|---|---|
| 5 | GPT Image 1.5 | 4.01 | $0.133 | Premium |
| 8 | Nano Banana Pro | 3.96 | $0.138 | Premium |
Which Should You Use?
GPT Image 1.5
Strengths
- +Slightly higher current public Sonnet score
- +Slightly lower listed price
- +Strong pick when OpenAI workflow compatibility matters
Limitations
- −No longer the clear leaderboard leader
- −Only 0.056 points ahead of Nano Banana Pro
Nano Banana Pro
Strengths
- +Nearly identical current Sonnet score
- +Strong premium alternative to GPT Image 1.5
- +Useful when Google model access or style is preferred
Limitations
- −Slightly more expensive in the current cost table
- −Sits just behind GPT Image 1.5 in the public ranking
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Methodology: Rankings and scores in this article align to VibeDex's current Sonnet 4.6 blind benchmark: 50 prompts, 3 passes, and 150 judgments per model across visual fidelity, physics, subject integrity, and instruction adherence. See our full methodology
FAQ
Is GPT Image 1.5 better than Nano Banana Pro now?
In the current Sonnet benchmark, GPT Image 1.5 is ahead by 0.056 points: 4.015 versus 3.959.
Which is cheaper?
GPT Image 1.5 is slightly cheaper at $0.133/image versus $0.138/image for Nano Banana Pro.
Does this article use retired Gemini benchmark scores?
No. This rewrite uses current Sonnet leaderboard scores only.
See how every model stacks up
The Vibedex leaderboard ranks 18 image models on a 50-prompt blind benchmark, judged by Claude Sonnet 4.6 across visual fidelity, physics, subject integrity, and instruction adherence.
See the leaderboard →