Author's Note: This guide provides a detailed comparison of the pricing structures, quality differences, and optimal selection strategies for the two major image generation APIs: chatgpt-image-latest and Nano Banana 2. It includes calculations for APIYI discounted rates and real-world cost estimates.
In 2026, the two heavyweights of the image generation API market—OpenAI's chatgpt-image-latest and Google's Nano Banana 2—operate on completely different pricing models: one charges a flat fee per image, while the other bills based on tokens. If you don't crunch these numbers, you could easily end up paying several times more for the same 1,000 images. This article breaks down everything from official pricing to APIYI discounted rates, helping you choose the most cost-effective solution for your needs.
Core Value: By the end of this article, you'll know exactly whether to choose chatgpt-image-latest or Nano Banana 2 based on your resolution and quality requirements, and how to secure the lowest possible price through APIYI.
Core Comparison of Official Pricing for Two Major Image APIs
Let's break down the official pricing for both models first, and then we'll look at the discounted rates available through APIYI.
Official Pricing for chatgpt-image-latest
chatgpt-image-latest uses a dual-billing system: a fixed fee for image generation + separate billing for text/image tokens.
Image Generation Fees (per image):
| Quality Level | 1024×1024 | 1024×1536 | 1536×1024 |
|---|---|---|---|
| Low | $0.009 | $0.013 | $0.013 |
| Medium | $0.034 | $0.050 | $0.050 |
| High | $0.133 | $0.200 | $0.200 |
Token Fees (additional charges):
| Token Type | Text Token | Image Token |
|---|---|---|
| Input | $5.00/M | $8.00/M |
| Cached Input | $1.25/M | $2.00/M |
| Output | $10.00/M | $32.00/M |
Note: The total cost for chatgpt-image-latest = Image generation fee + Token fees. Token fees will vary based on the length of your prompt and the complexity of the image.
Official Pricing for Nano Banana 2
Nano Banana 2 uses a pure token-based billing model, with image output tokens at $60/M and input tokens at only $0.25/M.
| Resolution | Output Token Consumption | Price per Image |
|---|---|---|
| 0.5K (512px) | 747 Tokens | $0.045 |
| 1K (1024px) | 1,120 Tokens | $0.067 |
| 2K (2048px) | 1,680 Tokens | $0.101 |
| 4K (4096px) | 2,520 Tokens | $0.151 |
🎯 Pricing Structure Differences:
chatgpt-image-latestis priced by quality level (Low/Medium/High), while Nano Banana 2 is priced by resolution (512px–4096px). You can't simply compare their "1024×1024" offerings directly—the High quality ofchatgpt-image-latestand the 1K resolution of Nano Banana 2 exist in different dimensions of visual quality.
APIYI Discounted Rates: How Much You'll Save on Each Model
This is the most practical part—here’s the pricing you can get for both models through APIYI.
APIYI Pricing for chatgpt-image-latest (20% Off)
APIYI offers a 20% discount on the official chatgpt-image-latest rates:
| Quality Level | 1024×1024 Official Price | APIYI Price (×0.8) | Savings per Image |
|---|---|---|---|
| Low | $0.009 | $0.007 | $0.002 |
| Medium | $0.034 | $0.027 | $0.007 |
| High | $0.133 | $0.106 | $0.027 |
APIYI Pricing for Nano Banana 2 (28% Discount + 4K Fixed Price)
APIYI provides even deeper discounts for Nano Banana 2:
| Resolution | Official Price | APIYI Price | Discount | Savings per Image |
|---|---|---|---|---|
| 0.5K | $0.045 | ~$0.013 | 28% Off | $0.032 |
| 1K | $0.067 | ~$0.019 | 28% Off | $0.048 |
| 2K | $0.101 | ~$0.028 | 28% Off | $0.073 |
| 4K | $0.151 | $0.045 Fixed Price | 70% Off | $0.106 |
The 4K discount is particularly impressive: The official price of $0.151/image drops to $0.045/image via APIYI, effectively a 70% discount. Furthermore, this $0.045 price for 4K is only 5 times the cost of chatgpt-image-latest Low quality at 1024×1024 ($0.009)—yet it provides 16 times the resolution (4096² vs 1024²).
Comparing Resolution Levels: Which One Is Actually More Cost-Effective?
To really see the price difference, you have to compare these two models at the same resolution.
1024×1024 Resolution Comparison (Core Scenario)
| Model + Quality | Official Price/Image | APIYI Price/Image | Quality Description |
|---|---|---|---|
| GPT Image Low | $0.009 | $0.007 | Fast, average quality, good for previews |
| NB2 1K | $0.067 | $0.019 | High-quality realism, fast speed |
| GPT Image Medium | $0.034 | $0.027 | Medium quality, suitable for daily use |
| GPT Image High | $0.133 | $0.106 | Highest quality, rich in detail |
Key Takeaways: At 1024×1024 resolution:
- GPT Image High ($0.106 APIYI price) vs NB2 1K ($0.019 APIYI price) → NB2 is 5.6x cheaper
- GPT Image Medium ($0.027) vs NB2 1K ($0.019) → NB2 is 30% cheaper
- Only GPT Image Low ($0.007) is cheaper than NB2—but the quality gap is noticeable.
High-Resolution Comparison (chatgpt-image max 1536 vs NB2 max 4K)
| Scenario | Model | Official Price | APIYI Price |
|---|---|---|---|
| chatgpt max | GPT Image High 1536×1024 | $0.200 | $0.160 |
| NB2 2K | NB2 2048×2048 | $0.101 | $0.028 |
| NB2 4K | NB2 4096×4096 | $0.151 | $0.045 |
NB2's 4K (4096×4096) costs just $0.045 on APIYI—that's 72% cheaper than the APIYI price for chatgpt-image-latest High 1536×1024 ($0.160), while offering over 7x the resolution.
Non-Price Differences Between the Models
Price isn't the only factor to consider.
chatgpt-image-latest vs Nano Banana 2 Capability Comparison
| Comparison Dimension | chatgpt-image-latest | Nano Banana 2 |
|---|---|---|
| Generation Speed | ~44 seconds | ~13 seconds (3x faster) |
| Max Resolution | 1536×1024 | 4096×4096 (4K) |
| Text Rendering | Strong (high accuracy) | Medium (might struggle with complex text) |
| Realism Quality | Good | Better (leads in realism benchmarks) |
| Multi-turn Editing | Not supported | Supported (conversational editing) |
| Face Consistency | Limited | Supported (up to 14 reference images) |
| Aspect Ratio | 1:1, 2:3, 3:2 | 14 aspect ratios |
| Image Editing | Not supported | Supported (conversational) |
Quick Summary:
- Need accurate text rendering (posters, UI design, product labels) → Choose chatgpt-image-latest
- Need realism + speed + high resolution + image editing → Choose Nano Banana 2
- Need lowest cost for bulk generation → Choose chatgpt-image-latest Low ($0.007/image APIYI price)
🎯 Selection Advice: If your scenario doesn't require precise text rendering, Nano Banana 2's price-to-performance ratio on APIYI completely crushes chatgpt-image-latest. You get 4K resolution for just $0.045, and it's 3x faster.
Both models can be called directly via APIYI at apiyi.com, with a single API key covering both.
Code Example for Integrating Two Image Models via APIYI
Minimalist Example: Switching Between Two Models Using the Same SDK
import openai
client = openai.OpenAI(
api_key="YOUR_API_KEY",
base_url="https://vip.apiyi.com/v1"
)
# Option A: chatgpt-image-latest (Ideal for text rendering scenarios)
response_gpt = client.images.generate(
model="chatgpt-image-latest",
prompt="A product promotional poster with the title 'Spring Sale 50% OFF'",
size="1024x1024",
quality="medium"
)
# Option B: Nano Banana 2 (Ideal for photorealistic + high-resolution scenarios)
response_nb = client.chat.completions.create(
model="gemini-3.1-flash-image-preview",
messages=[
{"role": "user", "content": "A photorealistic image of a golden retriever running on the beach"}
]
)
Tip: The API invocation methods for these two models differ—
chatgpt-image-latestusesimages.generate, whileNano Banana 2useschat.completions.create. By using the APIYI (apiyi.com) API proxy service, you can access both without needing separate OpenAI or Google accounts.
FAQ
Q1: Which is better: chatgpt-image-latest (Medium quality) or Nano Banana 2 (1K)?
Both offer the same resolution (1024×1024), but they have different stylistic strengths. The chatgpt-image-latest Medium model excels at text rendering and UI element accuracy, making it a great choice for designs that include text. Nano Banana 2 1K, on the other hand, delivers superior photorealistic quality and is over 3 times faster (13 seconds vs. 44 seconds). If your image doesn't require text, NB2 is also 30% cheaper on APIYI ($0.019) compared to GPT Medium ($0.027).
Q2: How are the extra token costs for chatgpt-image-latest calculated?
In addition to the fixed price for image generation, chatgpt-image-latest incurs token costs. Text tokens (your prompt) are billed at $5/M for input, while image tokens (if you provide a reference image) are billed at $8/M for input and $32/M for output. Simple text prompts usually consume a few hundred tokens (less than $0.01), but if you include a reference image, the token costs can actually exceed the image generation fee. For Nano Banana 2, input tokens are only $0.25/M, making that cost negligible.
Q3: Why is the Nano Banana 2 4K fixed price on APIYI only $0.045?
The official 4K price of $0.151 is calculated based on standard token pricing ($60/M × 2520 tokens). APIYI leverages bulk discounts through our partnership with Google Cloud and offers a special fixed-price plan for 4K scenarios, resulting in an effective discount of about 70%. The model and quality are identical to the official version; this is not a downgraded service.
Q4: Can I use both models in the same project?
Absolutely. By using the unified APIYI apiyi.com access, a single API key can call both chatgpt-image-latest and Nano Banana 2. We recommend this hybrid strategy: use GPT Image for text posters or UI designs, and use NB2 for photorealistic images, creative visuals, or 4K high-definition output. For batch thumbnails, GPT Image Low is a great choice.
Summary
Key takeaways for comparing chatgpt-image-latest and Nano Banana 2:
- Significant Price Gap: At 1024×1024, Nano Banana 2 on APIYI ($0.019) is 5.6 times cheaper than GPT Image High ($0.106). Furthermore, NB2 4K on APIYI is just $0.045, which is 72% cheaper than the High mode of GPT Image at its maximum resolution ($0.160).
- Different Strengths: chatgpt-image-latest is more accurate with text rendering, while Nano Banana 2 offers higher photorealistic quality, is 3 times faster, and supports 4K and multi-turn editing.
- APIYI Discount Structure: chatgpt-image-latest is available at a 20% discount, while Nano Banana 2 features a 28% discount on tokens plus a $0.045 fixed price for 4K (a 70% discount).
We recommend using APIYI apiyi.com to access both models—cover everything with one key, choose the right model for your specific scenario, and enjoy the best available discounts.
📚 References
-
OpenAI chatgpt-image-latest Documentation: Official model specifications and pricing
- Link:
platform.openai.com/docs/models/chatgpt-image-latest - Note: Includes details on Low/Medium/High quality levels and token pricing.
- Link:
-
OpenAI API Pricing: Official pricing page
- Link:
openai.com/api/pricing/ - Note: Contains the complete price list for image generation and tokens.
- Link:
-
Nano Banana 2 Image Generation Documentation: Official Google API reference
- Link:
ai.google.dev/gemini-api/docs/image-generation - Note: Includes information on resolution, token consumption, and pricing.
- Link:
-
APIYI Documentation Center: Discounted pricing and integration guides for both image models
- Link:
docs.apiyi.com - Note: Features a 20% discount on chatgpt-image-latest and a 28% discount on Nano Banana 2.
- Link:
Author: APIYI Technical Team
Technical Discussion: Feel free to join the discussion in the comments section. For more resources, visit the APIYI documentation center at docs.apiyi.com.
