ChatGPT or Gemini for AI Photo Editing: Which Is Better in 2026?

What each app runs in September 2026

Both companies replaced their image models more than once this year. The names below are what you get in the consumer apps today.

Nano Banana 2 is the default image model in the Gemini app. Image: Google announcement.

How photo editing works in each app

The basic loop is the same in both: upload a photo, describe the change, review, then ask for more changes in the same chat. The details differ.

Side by side

Figures are as published by each company or reported by independent reviewers at the time of writing. Usage limits change often.

Editing precision

 Edge: ChatGPT

The biggest complaint about chat based editors was that asking for one small change rebuilt the whole picture. A request to fix the lighting on a wall would come back with a different face, a different shirt and a slightly different room. Both companies have worked on this through 2026.

What OpenAI changed

OpenAI describes Images 2.5 as better at editing only what you asked for while keeping the rest of the details the same, including with complex subjects and busy backgrounds. The examples in its launch post cover full body outfit edits and changing one line of text on a ticket without touching the rest of the design.

Comments are the practical difference. You can now place a note directly on part of an image and describe the change there. That removes the guesswork of writing the top left corner behind the lamp and hoping the model reads it the same way.

Multi turn consistency is the other change. In a long conversation, earlier edits are more likely to stay in place and each new edit builds on the last without the image slowly degrading. Independent coverage on launch day described this as the first version where an edit, review, edit again workflow holds together.

What Google offers

Gemini handles local edits by description. Google's own examples cover changing a background, replacing an object or adding an element while keeping the rest of the photo intact. It also supports applying the style of one image to another, which is useful for matching a set of photos.

Thinking mode helps with complicated instructions. When it is on, the model reasons through the prompt before rendering, which Google says improves prompt adherence on multi part requests.

What Gemini lacks is a way to point. Every location has to be written out. For simple edits that is fine. For a crowded photo with several similar objects it takes more attempts.

A photo restyled with ChatGPT Images 2.5 using a shared prompt. Image: OpenAI announcement.

Keeping faces consistent

 Close: both strong

Face drift is the main reason people gave up on AI edits of family photos. A year ago both tools would return a stranger who looked a bit like the person, and the resemblance got worse with every follow up edit.

Google moved first

The original Nano Banana release in August 2025 was built around this problem. Google said the update was designed so photos of friends, family and pets look consistently like themselves, whether you change a hairstyle, an outfit or the whole scene. Nano Banana 2 kept that focus and added higher fidelity. Reviewers through 2026 have repeatedly rated Gemini as one of the most consistent tools for realistic people.

OpenAI caught up in September

Images 2.5 is aimed at the same problem. OpenAI says subjects from reference photos look more recognisable, lighting and textures feel more natural, and distinctive features are more likely to carry through into new settings and styles. Its launch examples include a child's portrait remixed into new scenes and a photobooth photo turned into a headshot.

One reported limitation is that the identity anchoring works within a conversation. There is no saved face profile you can reuse across chats, so a recurring character has to be re-uploaded each time.

Our test

We ran a set of long prompts that asked the model to keep an uploaded face and rebuild everything else: outfit, jewellery, setting and lighting. ChatGPT held the likeness while producing detailed fabric and embroidery. Gemini produced comparable likeness on the same prompts. Neither was perfect on every run, which is why generating more than once still matters.

Generated with ChatGPT from one uploaded reference photo and a text prompt. Outfit, setting and lighting came from the prompt.

Speed

 Close, depending on mode

ChatGPT was the slower tool for most of 2025 and early 2026. Images 2.5 cuts latency by up to 50 percent compared with Images 2.0 according to OpenAI. Free accounts are still described as slower than paid ones on OpenAI's pricing page.

Gemini's Fast mode on Nano Banana 2 is built for quick iterations. Google added a 512 pixel resolution tier specifically to minimise latency for rapid drafts, and a developer partner reported a roughly 75 percent latency reduction after moving to Nano Banana 2. Pro mode is slower because it reasons before rendering and outputs at higher resolution.

In practice, both return a standard edit in well under a minute on a paid plan. Thinking modes on either side add time in exchange for better prompt adherence.

Resolution, aspect ratios and text

 Edge: Gemini for resolution

Resolution

Gemini is the only one of the two that publishes a resolution ladder. Nano Banana models offer 512 pixel, 1K, 2K and 4K output, with 4K reserved for Nano Banana Pro. That makes it the safer choice for print or large crops.

OpenAI does not publish a maximum resolution for images made inside the ChatGPT app. Output is high enough for social media and screens. If you need a specific pixel size, the API is the place to set it.

Aspect ratios

ChatGPT offers horizontal, square and vertical formats. Gemini supports a wider set, and Nano Banana 2 added extreme ratios such as 4:1, 1:4, 8:1 and 1:8 for banners and tall panels.

Text inside images

Both models render legible text now, which was not true two years ago. OpenAI's Images 2.0 made text rendering and multilingual text a headline feature. Google's Nano Banana Pro is known for accurate text in multiple languages, and Nano Banana 2 can translate text inside an image, which Google calls in-image localisation.

For photo editing this matters when you want to change a sign, a label or a ticket in a photo without redrawing the rest.

Free limits and pricing

 Edge: Gemini

Free accounts

Gemini gives free users more image edits per day. Google describes the free allowance as approximately 20 images per day on the standard model, resetting at midnight Pacific time. Nano Banana Pro is mostly reserved for paid plans, with a small daily allowance for free users before the app switches back to the standard model.

OpenAI does not publish a fixed image count. Its pricing page describes the free tier as limited and slower image generation, Go as including image generation, Plus as expanded and faster, and Pro as unlimited. Independent trackers in August 2026 observed only a few images per day on free accounts, though the exact number moves with demand.

Paid plans

Two extra points on the Google side. Google AI Studio, the developer console, has its own separate quota and its output does not carry the visible watermark. And business Google Workspace accounts have needed a paid add on for Nano Banana Pro since March 2026, so a work account may see fewer features than a personal one.

Watermarks and provenance

 Edge: ChatGPT, if you want clean output

Every image created or edited in the Gemini app carries a visible watermark in the corner plus Google's invisible SynthID mark. The visible mark stays on paid consumer plans. Google's stated reason is to make a clear distinction between AI visuals and original human work.

ChatGPT output has no visible watermark. OpenAI attaches C2PA content credentials and an invisible watermark so the image can still be identified as AI made by tools that check for them. Both companies also run safety checks on prompts and uploads, so some edits of real people will be refused.

For personal use the visible mark rarely matters. For anything you plan to publish, sell or print, it is a real difference, and cropping it out is against Google's terms.

Extra tools that affect editing

For developers and teams

If you are building photo editing into an app rather than using the chat, both models are available by API.

OpenAI released two API models alongside Images 2.5. GPT-Image-2.5 Flare is the default, with the same quality and editing gains at 50 percent lower latency than GPT-Image-2. GPT-Image-2.5 Sunburst is the premium option with tighter control across edits and longer generation times. Adobe has added the 2.5 models to Firefly, and Higgsfield and Runway have integrated them.

Google offers Nano Banana 2 and Nano Banana Pro through the Gemini API, Google AI Studio and Vertex AI. Developer controls include configurable thinking levels, the full aspect ratio list, the 512 pixel to 4K resolution ladder and web grounded image search. A paid API key is required for Nano Banana 2 in AI Studio.

Pricing on both sides is per image and varies by resolution. Check the current pricing pages before estimating costs, since both companies changed image pricing during 2026.

What neither does well

Both tools regenerate the image rather than editing pixels. That has consequences worth knowing before you rely on them.

•     No non destructive editing. There are no layers, masks or history you can step back through. Each result is a new file.

•     No RAW or colour management. Neither reads RAW files or works in a managed colour space. Skin tones and colours can shift slightly between edits.

•     Fine detail can change. Small text, logos, jewellery and patterns may be redrawn even when you asked for them to stay. Check the parts you did not mention.

•     Results vary between runs. The same prompt gives different output each time. Generate more than once and keep the best.

•     Content rules apply. Both refuse some edits of real people, especially anything that could mislead, and both may decline edits involving public figures.

•     Upload limits. Very large files are downscaled on upload, so start from a good quality original rather than a screenshot.

Which one to pick

Family photos and portraits

Either. Both now hold likeness well. Try the same photo in both and keep the one that looks most like the person.

Lots of edits on a free account

Gemini. The daily allowance is larger and published.

Step by step refinement

ChatGPT. Comments on the image and stronger multi turn consistency make long editing sessions easier.

Print or high resolution

Gemini with Nano Banana Pro on a paid plan for 4K output.

Publishing without a visible mark

ChatGPT. Gemini app output carries a visible watermark.

Combining several photos

Gemini. Blending is a core feature and works from the free tier.

Changing text in a photo

Either. Both render text well now. Gemini can also translate text inside the image.

Product cut outs and composites

ChatGPT, for transparent background output.

Guiding layout with a drawing

ChatGPT, using Sketch.