The 5 AI Apps to Try in 2026: GPT-5.5 Support and Taiwan Traditional Chinese Checks

First, separate model support from language quality

“Supports GPT-5.5” and “works well in Taiwan Traditional Chinese” are different claims.

For GPT-5.5 support, the safest evidence is an official announcement, help page, changelog or in-app model selector. On that basis, ChatGPT has the strongest evidence in this comparison: OpenAI published GPT-5.5 on April 23, 2026, released a GPT-5.5 System Card, and says GPT-5.5 Thinking supports the full set of current ChatGPT tools, including web search, data analysis, image analysis, file analysis, Canvas, image generation, Memory and Custom Instructions.

For Taiwan Traditional Chinese, the bar should be higher than “it can answer in Chinese.” Third-party ChatGPT language lists often use broad labels such as Chinese or Mandarin Chinese, but those labels do not prove Taiwan-specific localization or writing style. If the output will be used for customer support, legal drafts, brand copy or public-facing documents, test it with your own Taiwan-facing materials before trusting it.

1. ChatGPT: the clearest GPT-5.5 choice

If the main question is “Which app can I most confidently use with GPT-5.5?”, the answer from these sources is ChatGPT.

OpenAI has published a GPT-5.5 introduction page and a GPT-5.5 System Card. Its Help Center also says GPT-5.5 Thinking works in ChatGPT with tools such as web search, data analysis, image analysis, file analysis, Canvas, image generation, Memory and Custom Instructions.

That makes ChatGPT the strongest GPT-5.5-backed option among the five apps compared here. It is also the most obvious first app to test for general work: drafting, research summaries, file analysis, spreadsheet-style analysis, image understanding, document cleanup and content ideation all fall within the kinds of ChatGPT tool support described by OpenAI.

The Taiwan Traditional Chinese question still needs caution. The sources here do not show an OpenAI page promising a dedicated “Taiwan Traditional Chinese” mode. Third-party language lists mention Chinese or Mandarin Chinese, but that is not the same as a guarantee of Taiwan-specific wording, punctuation, tone or business style.

For serious use, ask explicitly for Traditional Chinese for Taiwan, then check whether it avoids wording that feels unnatural for your audience, keeps your brand terms consistent and uses a tone that fits the setting.

2. Perplexity: excellent for research, but GPT-5.5 is not proven here

Perplexity’s biggest appeal is not that it is a model brand. It is a research experience. A third-party platform comparison describes Perplexity as strong for real-time research and fact-checked answers, which makes it useful when you need to compare sources, trace claims or build a quick research brief with citations.

But the sources provided here do not support saying Perplexity already offers GPT-5.5. The official Perplexity changelog cited in the source set is dated March 6, 2026, and it says GPT-5.4 and GPT-5.4 Thinking were made available to Pro and Max subscribers. That does not prove GPT-5.5 availability.

So the practical rule is simple: choose Perplexity if your priority is research and source discovery. If your priority is specifically GPT-5.5, check Perplexity’s latest official changelog or the model selector inside the app before relying on it.

3. Google Gemini: best judged by Google workflow, not GPT-5.5

Gemini is not a GPT-5.5 app. It is Google’s own AI product line.

The reason to try Gemini is workflow fit. A third-party comparison highlights Gemini’s Google ecosystem integration, including Gmail, Docs and Sheets scenarios. The same source lists Gemini 3 Pro as the key model or engine, not OpenAI GPT-5.5.

That makes Gemini most relevant if your work already revolves around Gmail, Google Docs, Google Sheets, Drive, Android or other Google services. Its value is being close to those tools, not being an OpenAI model gateway.

For Taiwan Traditional Chinese, the sources here do not provide official Taiwan-specific support evidence. The best test is to use real work samples: a Gmail draft, a meeting summary, a product description or a customer-service reply, then judge whether the wording sounds right for Taiwan readers.

4. Claude: strong for long documents and reasoning workflows

Claude belongs in the comparison if you often work with long, dense material.

Third-party comparisons describe Claude as useful for thoughtful writing, document reasoning and context-heavy tasks, and also place it in coding and long-document scenarios. That makes it a sensible app to test alongside ChatGPT for strategy documents, research reports, contract drafts, meeting transcripts and code review.

But Claude is not GPT-5.5. The source here points to Claude / Opus models rather than OpenAI GPT-5.5.

As with the other tools, Taiwan Traditional Chinese should be evaluated with real documents. The question is not simply whether Claude can produce Chinese. The better question is whether it can maintain Taiwan-appropriate tone, terminology and formatting across a full document.

5. Notion AI: most useful when your work already lives in Notion

Notion AI is less about replacing every other AI app and more about putting AI inside a workspace you already use.

Third-party comparisons describe Notion AI as useful for writing, summarizing and organizing inside a workspace. Another review notes strengths such as workspace-wide Q&A across Notion content, document generation and meeting notes.

Its limitation is just as important. The same review says Notion AI falls short outside Notion: it cannot send emails, schedule calendar events or interact with tools beyond the Notion ecosystem. If your team already lives in Notion, it can be a natural add-on; if Notion is only one of many tools you use, the AI may feel siloed.

On GPT-5.5, the sources here do not show that Notion AI lets you directly select GPT-5.5. If clear GPT-5.5 access is your top requirement, ChatGPT is the more direct choice from the available evidence.

How to test Taiwan Traditional Chinese properly

Because the provided sources do not prove full official Taiwan Traditional Chinese support across all five apps, do not rely only on a language list. Run a short, practical test with your own material.

Try these three checks:

1. Taiwan business tone
   Ask the AI to write a polite business email in Traditional Chinese for Taiwan. Look for natural wording, appropriate formality and terms your customers would actually use.

2. Traditional Chinese document comprehension
   Upload or paste a Traditional Chinese PDF, meeting note or workspace page. Ask for a summary, action items, contradictions or a rewritten version.

3. Brand and local wording consistency
   Give the AI a product description or support reply. Ask it to adapt the text for a Taiwan SaaS, ecommerce or customer-service audience, then check whether the vocabulary matches your style guide.

If the output repeatedly needs heavy editing, the app may be able to “do Chinese” but still fall short of your Taiwan Traditional Chinese standard.

Bottom line: which app should you try first?

• If GPT-5.5 matters most, start with ChatGPT. OpenAI’s own materials and Help Center provide the strongest evidence for GPT-5.5 and GPT-5.5 Thinking support in ChatGPT.
• If research and citations matter most, try Perplexity. It is positioned as a real-time research and source-backed answer tool, but GPT-5.5 support is not proven by the provided changelog.
• If your workflow is built around Google, try Gemini. Its advantage is Google ecosystem integration, not GPT-5.5 access.
• If you handle long documents or code, try Claude. Third-party comparisons place it in long-document, document-reasoning and context-heavy workflows.
• If your team already runs on Notion, try Notion AI. It is useful inside the Notion workspace, though its cross-tool ability is limited by that environment.

For a single starting point, ChatGPT is the most defensible choice if GPT-5.5 is the requirement. For Taiwan Traditional Chinese, the smartest move is not to trust a label. Test each app with your real documents, your real tone and your real workflow.