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ChatGPT vs Anthropic: Claude Sonnet 5: Complete Comparison 2026

Choosing between ChatGPT and Anthropic: Claude Sonnet 5? We compare both tools across features, pricing, pros and cons to help you decide which is the better fit in 2026.

ChatGPT9.5

OpenAI · Chatbots & LLMs, Coding, Writing

ChatGPT is OpenAI's flagship conversational AI, powering hundreds of millions of weekly users across web, mobile and API. Built on the GPT-4o and GPT-5 family of models, it handles text, images, voice and code in a single interface. With browsing, data analysis, custom GPTs and a vast plugin ecosystem, it remains the default assistant for most knowledge workers.

Anthropic: Claude Sonnet 59.2

Anthropic · Chatbots & LLMs

Sonnet 5 is Anthropic's most capable Sonnet-class model, with frontier performance across coding, agents, and professional work. It supports adaptive thinking with selectable reasoning effort levels (low, medium, high, max,...

Key differences at a glance

  • •ChatGPT scores higher overall (9.5 vs 9.2).
  • •ChatGPT has a free tier; Anthropic: Claude Sonnet 5 does not.
  • •Context windows differ: ChatGPT offers 128K tokens, Anthropic: Claude Sonnet 5 offers 1,000,000 tokens.
  • •ChatGPT leans on most polished and widely supported ecosystem.

Side-by-side comparison

FeatureChatGPTOpenAIAnthropic: Claude Sonnet 5Anthropic
Quality score9.5 / 109.2 / 10
Starting price$20/mo$2.00/1M tokens
Free tierYes — Free tier availableNo
API input price$30 / 1M tokens$2 / 1M tokens
API output price$180 / 1M tokens$10 / 1M tokens
SpeedFast—
Context window128K tokens1,000,000 tokens
CategoriesChatbots & LLMs, Coding, WritingChatbots & LLMs
Key features
  • Multimodal text, image and voice input
  • Advanced data analysis (code interpreter)
  • Custom GPTs and GPT Store
  • Web browsing and real-time search
  • 1,000,000-token context window
  • Vision (image input)
  • Reasoning / chain-of-thought
  • Tool / function calling
Pros
  • + Most polished and widely supported ecosystem
  • + Excellent general reasoning and coding
  • + Huge third-party integration support
    Cons
    • − Usage caps on the most capable models
    • − Can be verbose and overly cautious

      ChatGPT

      Choose ChatGPT if you want most polished and widely supported ecosystem and a free tier to start.

      Anthropic: Claude Sonnet 5

      Choose Anthropic: Claude Sonnet 5 if you want research and writing.

      Pricing comparison

      ChatGPT
      $20/mo
      API: $30 in / $180 out per 1M tokens
      Anthropic: Claude Sonnet 5
      $2.00/1M tokens
      API: $2 in / $10 out per 1M tokens
      查看即時 API 價格數據 → llmprice.app

      The verdict

      Overall, ChatGPT edges ahead with a quality score of 9.5 versus 9.2 for Anthropic: Claude Sonnet 5. Choose ChatGPT if you want most polished and widely supported ecosystem. That said, Anthropic: Claude Sonnet 5 is the better pick when matters most — so the right answer depends on your priorities and budget.

      Try ChatGPT →Try Anthropic: Claude Sonnet 5 →

      Frequently asked questions

      Q. Which is better, ChatGPT or Anthropic: Claude Sonnet 5?

      On our scoring, ChatGPT edges ahead (9.5/10), but the right pick depends on your priorities and budget — see the breakdown above.

      Q. Is ChatGPT or Anthropic: Claude Sonnet 5 cheaper?

      ChatGPT has a free tier, so it's cheaper to start. Anthropic: Claude Sonnet 5 begins at $2.00/1M tokens.

      Q. Can I use ChatGPT and Anthropic: Claude Sonnet 5 together?

      Yes — many teams use more than one AI tool, picking ChatGPT for some tasks and Anthropic: Claude Sonnet 5 for others where it's stronger.