ChatGPT, Claude, Gemini: Which Should You Pick?
The three leading generative AI services—ChatGPT (OpenAI), Claude (Anthropic), and Gemini (Google)—have each evolved on their own paths in 2026, and the differences in what they're good at are sharper than ever. The era of "just use ChatGPT" is over: picking the right tool per use case, or running multiple side by side, is now the standard.
Even so, multiple subscriptions add up, even at a few thousand yen each. This article draws on Mihata's hands-on use of each AI in client engagements and compares the three fairly across pricing, Japanese fluency, strengths, and security. The goal is to give you a usable basis for deciding "which fits our work best."
Pricing and specs in this article are based on publicly available information as of April 2026. Always confirm the latest details on each vendor's official site.
At-a-Glance Comparison of the Big Three
Start with the big picture. We'll go deeper in the following sections, but a quick "how do they roughly differ" view is the right first step in selection.
Plans and Strengths Compared
Item | ChatGPT | Claude | Gemini |
|---|---|---|---|
Provider | OpenAI | Anthropic | |
Free plan | Yes (limited) | Yes (limited) | Yes (limited) |
Personal paid plan | Plus, around USD 20/mo | Pro, around USD 20/mo | AI Pro, around JPY 2,900/mo |
Higher-tier plan | Pro, USD 200/mo | Max, USD 100-200/mo | AI Ultra, around JPY 36,000/mo |
Strengths | All-rounder, image generation, voice chat | Long-form writing, coding, summarization | Search integration, long-video analysis, Workspace integration |
Japanese fluency | High | Very high | High |
Context length | Comfortably large by default | Over 200K tokens | Over 1M tokens |
Main ecosystem | GPTs, API, desktop app | Projects, Claude Code, API | Google Workspace, NotebookLM |
All three offer free tiers, so the safe move is to try them and see which fits your work.
In One Line Each
- ChatGPT: When in doubt, start here. The broadest "all-rounder."
- Claude: A craftsman at writing, long-form reading, and code generation.
- Gemini: A workflow integrator that ties straight into Google Search and Workspace.
ChatGPT: Strengths and Best-Fit Uses
ChatGPT lit the generative AI spark and is still the most-used AI chat service in the world. Built by OpenAI, the latest models bundle nearly every major feature—image generation, voice chat, long-context reasoning—into one app.
Strengths
- Feature breadth: Text, image generation, voice chat, data analysis, and web browsing in a single app
- GPTs (custom GPTs): Build no-code AIs tailored to your business
- Rich Japanese training data: Natural Japanese for everything from business writing to casual conversation
- Third-party integrations: Already connected to many SaaS via API
Best-Fit Uses
If you want one tool that does just about anything, ChatGPT is the right pick. Use it for ideation, image creation, minute summaries, simple coding—the full range. Automating routine work with GPTs makes it feel like a dedicated assistant.
That said, on long-form structure or the more nuanced shades of Japanese, Claude (covered next) sometimes has the edge. "Wide and shallow on anything" versus "narrow and deep on writing" is the choice.
Caveats
Plans change over time, so always confirm the latest pricing on the official site before signing an annual deal. The free plan also caps usage and available models, so any serious adoption assumes a paid plan.
Claude: Strengths and Best-Fit Uses
Claude is built by Anthropic, a company focused on safety research. It is widely respected for the naturalness of its writing and the stability of its long-document processing. Adoption among Japanese writers and engineers has been strong, and entering 2026 it has been spreading fast among both individuals and companies.
Strengths
- Natural Japanese: Little of the "machine-translated" feel; usable as-is for external documents
- Accurate long-form summarization: Tens of thousands of characters of PDF or transcript, summarized cleanly
- Claude Code: Terminal-integrated coding support that understands a whole repository
- A measured, honest response style: Tends to say "I don't know" when it doesn't know
Best-Fit Uses
For work where text quality directly drives the outcome—blog posts, proposals, manuals, contract drafts—Claude is powerful. For engineers, Claude Code is a strong companion for design review and refactoring existing code. At Mihata, transcripts of long interviews and first drafts of requirements documents start in Claude more often than not.
Claude is also designed to limit hallucinations and tends to flag uncertainty. That makes it a good drafting tool in legal, medical, or other domains where accuracy matters most.