Comparison
ChatGPT alternatives
Claude, Gemini, Grok and DeepSeek are the assistants people most often weigh against ChatGPT. This page compares each one with the GPT-6 model it competes with and says plainly where each side is stronger.
How this comparison works
Each section pairs a rival with the GPT-6 model it is most often compared with. Full-size rivals are set against GPT-6 Sol, and fast, low-cost rivals against GPT-6 Luna. Comparing a fast model with a full-size one would not be fair to either.
Prices are API list prices on OpenRouter, in US dollars per million tokens, as of 25 September 2026. Consumer app plans change often, so they are not compared here. Strengths and weaknesses describe general tendencies, not benchmark results. Test with your own tasks before you commit.
chagpt.org is an independent website about ChatGPT. It is not affiliated with OpenAI or with any other company on this page.
Overview table
The two GPT-6 models at the top are the ones each rival is measured against.
| Model | Maker | Context | Input per 1M | Output per 1M | Open weights |
|---|---|---|---|---|---|
| GPT-6 Sol | OpenAI | 1.05M | $2 | $10 | No |
| GPT-6 Luna | OpenAI | 1.05M | $0.10 | $0.50 | No |
| Claude Opus 5.5 | Anthropic | 1M | $4 | $20 | No |
| Gemini 3.8 Flash | 1M | $0.75 | $3.75 | No | |
| Grok 4.7 | SpaceXAI | 500K | $1.60 | $4.80 | No |
| DeepSeek V4.1 Flash | DeepSeek | 1M | $0.15 | $0.60 | Yes |
Prices are OpenRouter API list prices in US dollars, checked on September 25, 2026. They apply only when you call the API yourself. The free chat on this site costs you nothing.
ChatGPT vs Claude
Claude is made by Anthropic. Its top model, Claude Opus 5.5, is a direct rival to GPT-6 Sol for writing, coding and analysis. Claude is known for a calm, careful writing style and for staying on task over long conversations.
Per token, Opus 5.5 costs twice as much as GPT-6 Sol. Both read about a million tokens in one request, so long documents are not a deciding factor.
Key facts, with the closest GPT model for reference
- Maker
- Anthropic
- Released: September 22, 2026
- Context window
- 1M
- GPT-6 Sol: 1.05M
- Input per 1M tokens
- $4
- GPT-6 Sol: $2
- Output per 1M tokens
- $20
- GPT-6 Sol: $10
- A heavy month
- $18
- GPT-6 Sol: $9
- Open weights
- No
- GPT-6 Sol: No
Where Claude is stronger
- Long-form writing that reads naturally and uses fewer stock phrases
- Careful work on long documents, such as contracts or research papers
- Coding help that explains trade-offs and checks with you before large changes
- A consistent, measured tone that suits professional use
Where ChatGPT is stronger
- Lower price: GPT-6 Sol costs half as much per token
- A much cheaper fast tier for everyday use: GPT-6 Luna
- A broader app, with voice, image and file features and many integrations
- Free use on this site without an account, through GPT-6 Luna
Who should pick it
Pick Claude if most of your work is writing or reading long documents, you value a careful tone over speed, and the higher API price is not a problem. Stay with ChatGPT if you want one app for many kinds of tasks or you keep a close eye on costs.
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ChatGPT vs Gemini
Gemini is Google's assistant. Gemini 3.8 Flash is its fast, lower-cost model, so its natural rival is GPT-6 Luna rather than the larger GPT-6 models.
Gemini's main draw is its link to Google products. If your day already runs on Gmail, Docs, Drive and Search, it fits into that routine with little setup. On price, however, Gemini 3.8 Flash costs more than seven times as much per token as GPT-6 Luna.
Key facts, with the closest GPT model for reference
- Maker
- Released: September 2, 2026
- Context window
- 1M
- GPT-6 Luna: 1.05M
- Input per 1M tokens
- $0.75
- GPT-6 Luna: $0.10
- Output per 1M tokens
- $3.75
- GPT-6 Luna: $0.50
- A heavy month
- $3.38
- GPT-6 Luna: $0.45
- Open weights
- No
- GPT-6 Luna: No
Where Gemini is stronger
- Works closely with Google services such as Gmail, Docs, Drive and Search
- Built into Android phones, so it is always one tap away
- Handles images, video and other media alongside text
- A natural choice for teams that already use Google Workspace
Where ChatGPT is stronger
- A much lower API price: GPT-6 Luna costs a fraction of Gemini 3.8 Flash per token
- A clear upgrade path within one family, from Luna to Sol to Astra
- No dependence on a Google account or Google services
- Free use on this site without signing in
Who should pick it
Pick Gemini if your work happens in Google apps and you want the assistant inside them. Pick ChatGPT if you want a standalone assistant, or if you are building an app and the price per token matters.
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ChatGPT vs Grok
Grok is made by SpaceXAI and is built into the social network X. Grok 4.7 is most often compared with GPT-6 Sol, as both are full-size models for demanding everyday work.
Grok's personality is a large part of its appeal. It answers in a more casual, direct tone, and it can draw on posts from X, which helps with fast-moving news and public debate. Keep in mind that posts are opinions and early reports, not checked facts.
Its context window is less than half the size of GPT-6 Sol's, while its prices per token are lower.
Key facts, with the closest GPT model for reference
- Maker
- SpaceXAI
- Released: September 21, 2026
- Context window
- 500K
- GPT-6 Sol: 1.05M
- Input per 1M tokens
- $1.60
- GPT-6 Sol: $2
- Output per 1M tokens
- $4.80
- GPT-6 Sol: $10
- A heavy month
- $5.60
- GPT-6 Sol: $9
- Open weights
- No
- GPT-6 Sol: No
Where Grok is stronger
- Access to posts on X, useful for following news and public reaction as it happens
- A casual, direct style that some people prefer to a more careful assistant
- Lower prices per token than GPT-6 Sol, especially for output
- Convenient if you already spend a lot of time on X
Where ChatGPT is stronger
- A context window about twice as large, for long documents and codebases
- A neutral tone that suits work documents and text for customers
- A full range of tiers, from the low-cost Luna to the deep-reasoning Astra
- Free use on this site without an account, through GPT-6 Luna
Who should pick it
Pick Grok if you follow news and discussion on X and like a blunt, informal style. Pick ChatGPT for work writing, long documents and anything where a neutral tone matters.
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ChatGPT vs DeepSeek
DeepSeek is a Chinese AI company. DeepSeek V4.1 Flash is its fast model and competes with GPT-6 Luna. Unlike every other model on this page, it has open weights: anyone can download it and run it on their own hardware.
Its price per token is close to GPT-6 Luna's, slightly higher for both input and output. The main reasons to choose it are control and openness, not price.
If you use DeepSeek's own app or API, your data is handled by a company based in China. Read its privacy policy if that matters to you. Running the open model yourself avoids this, but you have to set up and pay for the hardware.
Key facts, with the closest GPT model for reference
- Maker
- DeepSeek
- Released: September 10, 2026
- Context window
- 1M
- GPT-6 Luna: 1.05M
- Input per 1M tokens
- $0.15
- GPT-6 Luna: $0.10
- Output per 1M tokens
- $0.60
- GPT-6 Luna: $0.50
- A heavy month
- $0.60
- GPT-6 Luna: $0.45
- Open weights
- Yes
- GPT-6 Luna: No
Where DeepSeek is stronger
- Open weights: you can host the model yourself, study it and fine-tune it
- Data can stay on your own servers when you host it yourself
- Less dependence on one provider, since many hosts offer the same model
- A good fit for developers and researchers who want to adapt a model
Where ChatGPT is stronger
- A slightly lower price per token with GPT-6 Luna
- A polished app with many features, ready to use without any setup
- Deeper models in the same family when a task needs more: Sol and Astra
- Free use on this site without an account, through GPT-6 Luna
Who should pick it
Pick DeepSeek if you need to run a model on your own infrastructure, want full control over your data or plan to fine-tune. Pick ChatGPT if you want a ready-made assistant that works well without any setup.
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How to choose
No assistant is best at everything. These steps help you narrow the choice to one or two, and then decide with your own tasks.
- 1
Start with your tasks
Write down the three or four things you use an assistant for most. Writing, coding, research and quick questions favour different tools.
- 2
Look at where you already work
If your day runs on Google apps, Gemini has an advantage. If you spend time on X, Grok does. For a standalone app that covers many tasks, look at ChatGPT or Claude.
- 3
Decide how much control you need
If data must stay on your own servers, an open-weights model such as DeepSeek is the only option on this list.
- 4
Compare prices at the same tier
Compare a fast model with a fast model, and a full-size model with a full-size one. The overview table pairs them for you.
- 5
Test with your own prompts
Run the same three prompts in two assistants and compare the answers side by side. Your own tasks tell you more than any ranking.
A quick shortlist by need:
| If you need | Look at first |
|---|---|
| One app for many kinds of tasks | ChatGPT |
| Long-form writing and careful reading of long documents | Claude |
| An assistant inside Gmail, Docs and Drive | Gemini |
| Following news and discussion on X | Grok |
| A model you can run on your own servers | DeepSeek |
| The lowest price per token on this page | ChatGPT with GPT-6 Luna |
Questions
What is the best alternative to ChatGPT?
It depends on what you do. Claude is the closest all-round rival and is strong at writing. Gemini suits people who work in Google apps. Grok fits people who use X a lot. DeepSeek is the choice if you want an open model you can run yourself.
Is Claude better than ChatGPT?
For long-form writing and careful reading of long documents, many people prefer Claude. ChatGPT offers cheaper models and a broader app. Neither is better at everything, so test both on your own tasks.
Which is cheaper, ChatGPT or Gemini?
At API list prices, GPT-6 Luna costs much less per token than Gemini 3.8 Flash. Subscription prices for the apps are a separate matter and change often, so check each provider's current plans.
Is DeepSeek safe to use?
The open model can run on your own hardware, which keeps your data with you. DeepSeek's own app and API are run by a company based in China, so read its privacy policy and decide whether that fits your needs, especially for work data.
Can I try these alternatives on this site?
No. The free chat here runs only GPT-6 Luna. To try Claude, Gemini, Grok or DeepSeek, use their official apps or websites.
Is chagpt.org part of OpenAI?
No. chagpt.org is an independent website. It is not affiliated with OpenAI, Anthropic, Google, SpaceXAI or DeepSeek.
Try the ChatGPT side for free
Run one of the test prompts above in the free chat, then paste it into another assistant and compare.