Claude vs ChatGPT vs Gemini (2026): Which AI Is Best?
Claude vs ChatGPT vs Gemini in Oct 2026: Opus 5.5 leads coding, GPT-6 is the best all-round app, Gemini 4 Carbon tops the AA index. Prices, benchmarks, picks.
Quick answers
- Which is best: Claude, ChatGPT or Gemini?
- In October 2026 there is no single winner. Claude (Opus 5.5) is best for coding agents and long writing, ChatGPT (GPT-6) is the best all-round app, and Gemini (4 Argon, with 4 Carbon coming) is best for research and Google apps.
- Which is smartest right now?
- Gemini 4 Carbon tops the Artificial Analysis Intelligence Index v5 at 59 (Oct 28, 2026), but it is not open to most people yet. On the AA Coding Agent Index, Claude Code with Opus 5.5 leads at 62.
- How much do they cost?
- Claude Pro $20/month, ChatGPT Plus $20/month, Google AI Pro $19.99/month. All three have free plans. Paying for all three is about $60 a month.
- Can I use all three together?
- Yes. In Sumus you get Claude, GPT and Gemini in one account and one chat, so you can ask all three and let one check another.
Short answer: pick Claude for coding and writing, ChatGPT for an all-round app, Gemini for research and Google work, or use all three in one place. All three companies shipped big models in the last six weeks, so most older comparisons are out of date.
Here is what is live as of October 29, 2026: Anthropic's Claude Opus 5.5 (Sep 22), OpenAI's GPT-6 family rolling out in ChatGPT, and Google's Gemini 4 Argon (public Oct 13) with Gemini 4 Carbon announced Oct 28.
1. Claude vs ChatGPT vs Gemini at a glance
Claude | ChatGPT | Gemini | |
|---|---|---|---|
Company | Anthropic | OpenAI | |
Top model you can use | Opus 5.5 (Fable 5.1 for hardest work) | GPT-6 (Sol); GPT-6 Pro on Pro plans | Gemini 4 Argon |
Newest model | Haiku 5.5 (Oct 7) | GPT-6.1 Terra (Oct 26) | Gemini 4 Carbon (Oct 28, limited) |
Context window | 1M tokens | Up to 1.05M (GPT-6.1 Sol) | 1M tokens |
Free plan | Yes | Yes (GPT-5.6 Luna) | Yes (Flash models) |
Main paid plan | Pro $20/mo | Plus $20/mo | Google AI Pro $19.99/mo |
Top plans | Max $100 / $200 | Pro $100 / $200 / $500 | AI Ultra from $99.99 |
Best for | Coding agents, long writing | All-round app, tools, plugins | Research, Google apps, video input |
2. Which is smartest? Benchmarks
On the Artificial Analysis Intelligence Index v5, Gemini 4 Carbon is #1 at 59. On the AA Coding Agent Index, Claude Code with Opus 5.5 leads at 62, with Carbon second at 59. GPT-6 Astra is the cheapest of the three per index task ($6.25 vs $7.76 for Carbon and $10.04 for Opus 5.5 at max effort).
Test | Claude Opus 5.5 | GPT-6 Astra | Gemini 4 Carbon |
|---|---|---|---|
AA Coding Agent Index | 62 (#1) | - | 59 (#2) |
AA Intelligence Index v5 | Behind Carbon | Behind Carbon | 59 (#1) |
Cost per AA index task | $10.04 | $6.25 | $7.76 |
Hallucination rate (AA-Omniscience) | 50% | 50% | 11% |
What this means in plain words: Claude is still the one to beat for coding agents. Gemini makes up the least, which matters for research. ChatGPT gets you near the top for less money per task.
3. Claude vs ChatGPT vs Gemini price
For people, the three main plans cost about the same: $20, $20 and $19.99 a month. The gaps are in the cheap and expensive ends. ChatGPT has Go at $8. Google has AI Plus at $4.99. Claude jumps from $20 straight to Max at $100.
Model (API) | Input / 1M | Output / 1M |
|---|---|---|
Claude Opus 5.5 | $4 | $20 |
Claude Sonnet 5.5 | $2 | $10 |
Claude Fable 5.1 | $10 | $50 |
GPT-6 Astra | $10 | $50 |
GPT-6.1 Sol | $2 | $10 |
GPT-6.1 Terra | $1 | $5 |
Gemini 4 Argon / Carbon (intro) | $2 | $10 |
Gemini 4 Carbon (after intro) | $4 | $20 |
4. Claude: best for coding and writing
Claude Opus 5.5 does Fable 5.1-level work on most jobs for about 40% less than Opus 5, and it is the default in most coding tools. It writes in a calm, clear voice and keeps long documents straight. Weak spots: no image or video making, and the jump from Pro to Max is steep.
5. ChatGPT: best all-round app
ChatGPT has the most stuff in one app: GPT-6 with Intelligent UI answers, images, voice, deep research, Work and Codex. Plus users get GPT-6 in chat and GPT-6 Astra in Work and Codex; GPT-6 Pro in chat starts at the $100 Pro plan. One loss: ChatGPT stopped new group chats on July 9, 2026.
6. Gemini: best for research and Google apps
Gemini 4 Argon is in the Gemini app for AI Pro and Ultra users and works inside Gmail, Docs and Sheets. It takes text, images, video and speech. Gemini 4 Carbon is the new top model on the AA index, but for now only cyber defenders and Fairwind partners have it.
7. Which should you choose?
- You code or build agents: Claude (Opus 5.5).
- You want one app for everything: ChatGPT Plus.
- You live in Gmail and Docs, or do lots of research: Gemini.
- You want the cheapest good API model: GPT-6.1 Terra or Gemini 4 Argon.
- You can't pick: use all three. Different models catch different mistakes.
8. Use Claude, ChatGPT and Gemini in one place
Yes, you can skip the choice. In Sumus every model is an AI teammate in one chat: Claude writes, GPT reviews, Gemini checks the facts, all with the same context. One account replaces three $20 plans, and you can invite friends or coworkers into the same chat. See all in one AI in Sumus.
What we're watching
- When Gemini 4 Carbon reaches the Gemini app and API, and when its intro price ends.
- Whether GPT-6 Astra comes to ChatGPT Plus chat.
- The next Claude 5.5 model after Haiku 5.5.
FAQ
Is Claude better than ChatGPT?
For coding agents and long writing, yes: Opus 5.5 leads the AA Coding Agent Index. For an all-round app with images, voice and plugins, ChatGPT is ahead.
Is Gemini better than ChatGPT?
Gemini 4 Carbon scores higher on the AA Intelligence Index, and Gemini hallucinates less, but Carbon is not widely available yet. Day to day, Gemini 4 Argon and GPT-6 are close.
Is Claude better than Gemini?
Claude leads on coding agents; Gemini leads on overall index score, video input and Google app integration.
Which is cheapest?
All three main plans are about $20 a month. On the API, GPT-6.1 Terra ($1/$5) is the cheapest strong model of the three companies.
Can I use Claude, ChatGPT and Gemini together?
Yes. Sumus puts Claude, GPT and Gemini in one account and one chat, so you can compare answers or have one model review another.
Sources
- Anthropic: Introducing Claude Opus 5.5, Sep 22, 2026
- Artificial Analysis: Gemini 4 Carbon is the new #1, Oct 28, 2026
- OpenAI Help Center: GPT-6 and other models in ChatGPT; Google blog: Introducing Gemini 4 Carbon. Read Oct 29, 2026.
Update log
- — Oct 29: First published with Claude Opus 5.5, GPT-6 / GPT-6.1 and Gemini 4 Argon / Carbon.