Complete 2025 Comparison: ChatGPT, Claude, Gemini, Copilot, Perplexity, DeepSeek and Grok – Price, Performance and Reliability

Generative artificial intelligence has revolutionized how we work, create, and search for information. By 2025, the AI chatbot market is dominated by several major players, each with its own specific strengths and weaknesses. With 400 million weekly active users for ChatGPT alone—double the number in August 2024—generative AI has become an indispensable tool for professionals worldwide. But which one should you choose? This comprehensive guide helps you understand the differences between ChatGPT, Claude, Gemini, Copilot, Perplexity, DeepSeek, and Grok.

Position of the University of Neuchâtel on generative AI

Unine AI

The main players in the market

ChatGPT (OpenAI) – The versatile pioneer

ChatGPT remains the ideal tool for general use, offering versatility and improved accessibility. Launched in November 2022, ChatGPT revolutionized the industry and remains the undisputed leader with over 600 million monthly users.

Pricing:

• Free version: Access to GPT-3.5 with limitations
• ChatGPT Plus: 20 $/month providing access to GPT-4, faster response speeds, priority uptime, and additional features such as plugins, web browsing, and the ability to process images or voice input.
• ChatGPT Pro: 200 $/month for heavy users, offering unlimited GPT-4 usage, a larger pop-up window, and even higher priority access.
• Team and Enterprise plans: 20-30 $ per user/month

Strengths:

• For anything related to general knowledge or text generation, OpenAI models still dominate.
• Richest plugin ecosystem
• Advanced user memory
• GPT-4o achieves success rates exceeding 90% on complex comprehension and coherent generation tasks (%).

Claude (Anthropic) – The security and ethics expert

 

Developed by former OpenAI employees, Claude is known for its "safe" approach: it limits bias and prevents sensitive content. It is designed for regulated contexts such as finance or HR. .

Pricing:

• Free version: Limited access to Claude 3.5 Sonnet
• Claude Pro: 20 $/month
• Team: 30 $ per user/month
• Company: Customized pricing

Strengths:

• Claude Sonnet 4.5 crushes the competition in programming with 72.7% accuracy on SWE-bench
• Pop-up window for 200,000 tokens (Opus 4.1)
• Claude excels at proofreading. The chatbot finds and explains both factual and grammatical errors.
• Strict privacy policies

Gemini (Google) – The multimodal champion

Gemini stands out for its multimodal capabilities and integration with the Google ecosystem. It is recommended for users of Google services. .

Pricing:

• Free version: Access to Gemini 1.5 Flash
• Gemini Advanced: 20 $/month including 2 TB of Google One storage, access to Gemini in Gmail, Docs and Sheets, plus NotebookLM Plus
• Company: Integrated with Google Workspace

Strengths:

• Gemini 2.5 Pro has a pop-up offering approximately 1,000,000 tokens. Google confirms a pop-up offering 1 million tokens today, with “2 million coming soon.”
• When it comes to code generation and optimization, Gemini is undoubtedly number 1 in terms of performance.
• Native integration with the Google ecosystem
• Real-time access to information via Google Search

Microsoft Copilot – The productivity expert

Copilot shines thanks to its deep integration into the Microsoft environment. This makes it a preferred choice for Microsoft product users and developers. .

Pricing:

• Free version: Integrated with Windows and Edge
• Copilot Pro: 20 $/month
• Microsoft 365 Copilot: 30 $ per user/month

Strengths:

• Seamless integration with Word, Excel, Teams, Outlook
• Close connection with GitHub for development
• Real-time search via Bing

Perplexity – The intelligent search engine

Perplexity positions itself as a direct competitor to Google with its approach focused on real-time sourced search.

Pricing:

• Free version: Unlimited quick searches using the standard AI model. Up to 5 Pro searches per day.
• Perplexity Pro: 20 $s per month (or approximately 200 $s per year) with up to 300 Pro searches per day, advanced models such as GPT-4, Claude, or Mistral
• Perplexity Max: 50 $ per month, introduced in July 2025, for users requiring unlimited productivity
• Enterprise Pro: 40 $ per user per month, or 400 $ per year

Strengths:

• Transparent citations of sources for greater credibility
• Accurate and reliable real-time responses thanks to advanced natural language processing (NLP) capabilities
• Integration of several AI models (GPT-4, Claude, Mistral)

DeepSeek – The Chinese challenger

DeepSeek is China's most advanced chatbot, launched in January 2025. The model caused a sensation with its exceptional price-performance ratio.

Pricing:

• DeepSeek R1 is a 671 billion parameter system that outperforms GPT-4o at only 1/10th of the training cost (5.6 million $ vs. 100 million $)
• DeepSeek is offering discounted prices until February 8, 2025. However, the DeepSeek-R1 model is not included in this reduced pricing.
• API: 0.55 $ per million input tokens
• Open-source model under MIT license

Strengths:

• 97.3% accuracy on MATH-500
• Pop-up window for 128,000 tokens
• Extremely competitive cost
• Innovative architecture with reinforcement learning

Grok (Elon Musk's xAI) – The controversial AI

Grok is the AI assistant developed by xAI, Elon Musk's company, integrated into the X platform (formerly Twitter).

Pricing:

• X Premium Plus: 40 $ per month (or 395 $ per year) to access Grok 3
• SuperGrok: 30 $ per month, a competitive price compared to other AI
• SuperGrok Heavy: 300 $ per month, a premium option aimed at users with advanced needs

Strengths:

• Grok 4 can process up to 130,000 tokens per prompt
• He scored 25.4 % on the Humanity's Last Exam, placing him ahead of his main competitors.
• Real-time access to X data
• Multimodal capabilities integrating text, images, voice and soon video

Reliability and error rates: The worrying reality

One of the most critical aspects when choosing an AI chatbot concerns its reliability and error rate. Several independent studies have revealed worrying results.

Study by the EBU (European Broadcasting Union)

The EBU brought together 22 public service bodies from 18 countries and 14 languages to examine 3000 news-related responses from some of the most popular AI assistants: ChatGPT, Microsoft Copilot, Gemini and Perplexity. .

Alarming results:

• Google's Gemini performed the worst in terms of information sharing. Researchers found that 76% of its responses had problems, more than double the rate of the other models.
• Copilot came in second with 37 %, followed by ChatGPT with 36 % and Perplexity with 30 %
• The source of news information was the primary cause of significant problems in 31 of the cases; notably due to missing, misleading, or even incorrect attributions.
• 30 of the responses (%) contained incorrect or outdated information.

NewsGuard Audit: A worrying decline

A NewsGuard audit reveals that the rate of reproduction of false information by leading artificial intelligence chatbots has almost doubled in one year, rising from 18% to 35%. .

Reliability ranking (August 2025):

• Claude: 10 % error rate
• Gemini: 16.67 % error rate
• Copilot and Mistral: 36.67 % error rate
• ChatGPT and Meta: 40 % error rate
• Perplexity: 46.67 % error rate
• Pi of Inflection: 56.67 % error rate

A problematic change in behavior:
In 2024, these systems frequently adopted a cautious approach by refusing to answer questions on many current topics. In 2025, chatbots answer 100% of the questions asked, but produce inaccurate answers in 35% of the cases. .

Comparative performance by domain

Code generation

• Winner: Claude
  Claude Sonnet 4.5 crushes the competition in programming with 72.7% accuracy on SWE-bench
• When it comes to code generation and optimization, Gemini is undoubtedly number 1 in terms of performance.
• ChatGPT remains very effective for coding assistance

Creative writing

• Gemini 2.5 Pro takes the lead in the creative writing arena
• Claude Opus 4.1 joins Gemini at the top of the creative writing rankings
• ChatGPT excels in versatility but can sometimes be too formal.

Research and news

• Winner: Perplexity
  Perplexity excels in reliability and its ability to extend the discussion with follow-up questions.
• ChatGPT stands out for its ability to provide rich and verifiable answers by examining a large number of sources.
• Claude offers clear answers, but is limited to French-language sources.

Analysis of long documents

• Winner: Gemini
  Gemini 2.5 Pro has a pop-up window of approximately 1,000,000 tokens; if you work from giant briefs, PDF packs, or story bibles, it's the outstanding choice.

Professional integration

• Microsoft Copilot for the Microsoft 365 ecosystem
• Gemini for the Google Workspace ecosystem
• ChatGPT for flexibility and the plugin ecosystem
• Claude for regulated and secure environments

Privacy and security

Claude: Not enabled by default (Free/Pro/Max/Commercial) for using training data. Clear advantage. ChatGPT/Copilot/Gemini: Not enabled by default for Enterprise/Workspace. Can be used for Free/Paid Individual (with opt-out/variable controls). .

Prompt injection attacks, capable of hijacking instructions, have been demonstrated on ChatGPT, Gemini, and Claude. An OWASP survey listed this practice as one of the top risks for LLMs in 2025. .

The choice according to your needs

For developers:

Claude and Gemini stand out with their excellent code generation performance. Copilot remains an excellent choice for those already in the Microsoft ecosystem.

For copywriting and marketing:

ChatGPT offers the best versatility, while Claude excels in correction and stylistic refinement.

For research and news:

Perplexity stands out with its transparent quotes and superior reliability. Claude also boasts an excellent accuracy rate.

For data analysis:

Gemini, with its massive pop-up window, allows for the processing of considerable volumes of documents.

Regarding the budget:

DeepSeek offers unbeatable value for money, although it is controversial due to issues of technological sovereignty.

For confidentiality reasons:

Claude stands out with his strict policies of not using data for training.

Conclusion: Which chatbot should you choose in 2025?

Choosing the right AI assistant is not about choosing the most popular name: it's about finding the tool that truly aligns with your needs, workflows, and budget. .

Key points to remember:

1. No chatbot is perfect All of them show worrying error rates, particularly regarding current events.
2. Claude leads in reliability with only 10% errors according to the NewsGuard audit
3. ChatGPT remains the most versatile and has the largest ecosystem
4. Gemini excels in multimodality and Google integration
5. Perplexity is the best for research with its transparent sources
6. DeepSeek offers the best value for money but raises geopolitical questions
7. Grok remains controversial despite interesting technical performances

For an SME just starting out with enterprise AI adoption, here's the advice: start simple. Try ChatGPT free for a month. Identify your real needs. Then invest in the tool that best suits them. .

The important thing is not to follow the trend, but to choose the tool that truly meets your specific needs while critically examining the answers provided. An error rate of 35% (%) should encourage us to be cautious and always verify critical information. .

---

Article updated in November 2025. Prices and features can change rapidly in this constantly evolving sector.

Generative artificial intelligence has revolutionized how we work, create, and search for information. By 2025, the AI chatbot market is dominated by several major players, each with its own specific strengths and weaknesses. With 400 million weekly active users for ChatGPT alone—double the number in August 2024—generative AI has become an indispensable tool for professionals worldwide. But which one should you choose? This comprehensive guide helps you understand the differences between ChatGPT, Claude, Gemini, Copilot, Perplexity, DeepSeek, and Grok.

The main players in the market

ChatGPT (OpenAI) – The versatile pioneer

ChatGPT remains the ideal tool for general use, offering versatility and improved accessibility. Launched in November 2022, ChatGPT revolutionized the industry and remains the undisputed leader with over 600 million monthly users.

Pricing:

• Free version: Access to GPT-3.5 with limitations
• ChatGPT Plus: 20 $/month providing access to GPT-4, faster response speeds, priority uptime, and additional features such as plugins, web browsing, and the ability to process images or voice input.
• ChatGPT Pro: 200 $/month for heavy users, offering unlimited GPT-4 usage, a larger pop-up window, and even higher priority access.
• Team and Enterprise plans: 20-30 $ per user/month

Strengths:

• For anything related to general knowledge or text generation, OpenAI models still dominate.
• Richest plugin ecosystem
• Advanced user memory
• GPT-4o achieves success rates exceeding 90% on complex comprehension and coherent generation tasks (%).

Claude (Anthropic) – The security and ethics expert

Developed by former OpenAI employees, Claude is known for its "safe" approach: it limits bias and prevents sensitive content. It is designed for regulated contexts such as finance or HR. .

Pricing:

• Free version: Limited access to Claude 3.5 Sonnet
• Claude Pro: 20 $/month
• Team: 30 $ per user/month
• Company: Customized pricing

Strengths:

• Claude Sonnet 4.5 crushes the competition in programming with 72.7% accuracy on SWE-bench
• Pop-up window for 200,000 tokens (Opus 4.1)
• Claude excels at proofreading. The chatbot finds and explains both factual and grammatical errors.
• Strict privacy policies

Gemini (Google) – The multimodal champion

Gemini stands out for its multimodal capabilities and integration with the Google ecosystem. It is recommended for users of Google services. .

Pricing:

• Free version: Access to Gemini 1.5 Flash
• Gemini Advanced: 20 $/month including 2 TB of Google One storage, access to Gemini in Gmail, Docs and Sheets, plus NotebookLM Plus
• Company: Integrated with Google Workspace

Strengths:

• Gemini 2.5 Pro has a pop-up offering approximately 1,000,000 tokens. Google confirms a pop-up offering 1 million tokens today, with “2 million coming soon.”
• When it comes to code generation and optimization, Gemini is undoubtedly number 1 in terms of performance.
• Native integration with the Google ecosystem
• Real-time access to information via Google Search

Microsoft Copilot – The productivity expert

Copilot shines thanks to its deep integration into the Microsoft environment. This makes it a preferred choice for Microsoft product users and developers. .

Pricing:

• Free version: Integrated with Windows and Edge
• Copilot Pro: 20 $/month
• Microsoft 365 Copilot: 30 $ per user/month

Strengths:

• Seamless integration with Word, Excel, Teams, Outlook
• Close connection with GitHub for development
• Real-time search via Bing

Perplexity – The intelligent search engine

Perplexity positions itself as a direct competitor to Google with its approach focused on real-time sourced search.

Pricing:

• Free version: Unlimited quick searches using the standard AI model. Up to 5 Pro searches per day.
• Perplexity Pro: 20 $s per month (or approximately 200 $s per year) with up to 300 Pro searches per day, advanced models such as GPT-4, Claude, or Mistral
• Perplexity Max: 50 $ per month, introduced in July 2025, for users requiring unlimited productivity
• Enterprise Pro: 40 $ per user per month, or 400 $ per year

Strengths:

• Transparent citations of sources for greater credibility
• Accurate and reliable real-time responses thanks to advanced natural language processing (NLP) capabilities
• Integration of several AI models (GPT-4, Claude, Mistral)

DeepSeek – The Chinese challenger

DeepSeek is China's most advanced chatbot, launched in January 2025. The model caused a sensation with its exceptional price-performance ratio.

Pricing:

• DeepSeek R1 is a 671 billion parameter system that outperforms GPT-4o at only 1/10th of the training cost (5.6 million $ vs. 100 million $)
• DeepSeek is offering discounted prices until February 8, 2025. However, the DeepSeek-R1 model is not included in this reduced pricing.
• API: 0.55 $ per million input tokens
• Open-source model under MIT license

Strengths:

• 97.3% accuracy on MATH-500
• Pop-up window for 128,000 tokens
• Extremely competitive cost
• Innovative architecture with reinforcement learning

Grok (Elon Musk's xAI) – The controversial AI

Grok is the AI assistant developed by xAI, Elon Musk's company, integrated into the X platform (formerly Twitter).

Pricing:

• X Premium Plus: 40 $ per month (or 395 $ per year) to access Grok 3
• SuperGrok: 30 $ per month, a competitive price compared to other AI
• SuperGrok Heavy: 300 $ per month, a premium option aimed at users with advanced needs

Strengths:

• Grok 4 can process up to 130,000 tokens per prompt
• He scored 25.4 % on the Humanity's Last Exam, placing him ahead of his main competitors.
• Real-time access to X data
• Multimodal capabilities integrating text, images, voice and soon video

Reliability and error rates: The worrying reality

One of the most critical aspects when choosing an AI chatbot concerns its reliability and error rate. Several independent studies have revealed worrying results.

Study by the EBU (European Broadcasting Union)

The EBU brought together 22 public service bodies from 18 countries and 14 languages to examine 3000 news-related responses from some of the most popular AI assistants: ChatGPT, Microsoft Copilot, Gemini and Perplexity. .

Alarming results:

• Google's Gemini performed the worst in terms of information sharing. Researchers found that 76% of its responses had problems, more than double the rate of the other models.
• Copilot came in second with 37 %, followed by ChatGPT with 36 % and Perplexity with 30 %
• The source of news information was the primary cause of significant problems in 31 of the cases; notably due to missing, misleading, or even incorrect attributions.
• 30 of the responses (%) contained incorrect or outdated information.

NewsGuard Audit: A worrying decline

A NewsGuard audit reveals that the rate of reproduction of false information by leading artificial intelligence chatbots has almost doubled in one year, rising from 18% to 35%. .

Reliability ranking (August 2025):

• Claude: 10 % error rate
• Gemini: 16.67 % error rate
• Copilot and Mistral: 36.67 % error rate
• ChatGPT and Meta: 40 % error rate
• Perplexity: 46.67 % error rate
• Pi of Inflection: 56.67 % error rate

A problematic change in behavior:
In 2024, these systems frequently adopted a cautious approach by refusing to answer questions on many current topics. In 2025, chatbots answer 100% of the questions asked, but produce inaccurate answers in 35% of the cases. .

Comparative performance by domain

Code generation

• Winner: Claude
  Claude Sonnet 4.5 crushes the competition in programming with 72.7% accuracy on SWE-bench
• When it comes to code generation and optimization, Gemini is undoubtedly number 1 in terms of performance.
• ChatGPT remains very effective for coding assistance

Creative writing

• Gemini 2.5 Pro takes the lead in the creative writing arena
• Claude Opus 4.1 joins Gemini at the top of the creative writing rankings
• ChatGPT excels in versatility but can sometimes be too formal.

Research and news

• Winner: Perplexity
  Perplexity excels in reliability and its ability to extend the discussion with follow-up questions.
• ChatGPT stands out for its ability to provide rich and verifiable answers by examining a large number of sources.
• Claude offers clear answers, but is limited to French-language sources.

Analysis of long documents

• Winner: Gemini
  Gemini 2.5 Pro has a pop-up window of approximately 1,000,000 tokens; if you work from giant briefs, PDF packs, or story bibles, it's the outstanding choice.

Professional integration

• Microsoft Copilot for the Microsoft 365 ecosystem
• Gemini for the Google Workspace ecosystem
• ChatGPT for flexibility and the plugin ecosystem
• Claude for regulated and secure environments

Privacy and security

Claude: Not enabled by default (Free/Pro/Max/Commercial) for using training data. Clear advantage. ChatGPT/Copilot/Gemini: Not enabled by default for Enterprise/Workspace. Can be used for Free/Paid Individual (with opt-out/variable controls). .

Prompt injection attacks, capable of hijacking instructions, have been demonstrated on ChatGPT, Gemini, and Claude. An OWASP survey listed this practice as one of the top risks for LLMs in 2025. .

The choice according to your needs

For developers:

Claude and Gemini stand out with their excellent code generation performance. Copilot remains an excellent choice for those already in the Microsoft ecosystem.

For copywriting and marketing:

ChatGPT offers the best versatility, while Claude excels in correction and stylistic refinement.

For research and news:

Perplexity stands out with its transparent quotes and superior reliability. Claude also boasts an excellent accuracy rate.

For data analysis:

Gemini, with its massive pop-up window, allows for the processing of considerable volumes of documents.

Regarding the budget:

DeepSeek offers unbeatable value for money, although it is controversial due to issues of technological sovereignty.

For confidentiality reasons:

Claude stands out with his strict policies of not using data for training.

Conclusion: Which chatbot should you choose in 2025?

Choosing the right AI assistant is not about choosing the most popular name: it's about finding the tool that truly aligns with your needs, workflows, and budget. .

Key points to remember:

1. No chatbot is perfect All of them show worrying error rates, particularly regarding current events.
2. Claude leads in reliability with only 10% errors according to the NewsGuard audit
3. ChatGPT remains the most versatile and has the largest ecosystem
4. Gemini excels in multimodality and Google integration
5. Perplexity is the best for research with its transparent sources
6. DeepSeek offers the best value for money but raises geopolitical questions
7. Grok remains controversial despite interesting technical performances

For an SME just starting out with enterprise AI adoption, here's the advice: start simple. Try ChatGPT free for a month. Identify your real needs. Then invest in the tool that best suits them. .

The important thing is not to follow the trend, but to choose the tool that truly meets your specific needs while critically examining the answers provided. An error rate of 35% (%) should encourage us to be cautious and always verify critical information. .

---

Article updated in November 2025. Prices and features can change rapidly in this constantly evolving sector.