Claude vs ChatGPT: which one to pick for writing, coding and reasoning

Claude vs ChatGPT: the short answer

Claude wins at writing and at coding on real projects; ChatGPT wins on versatility for a lower price. A ChatGPT 4.1 message costs 220 gems, a Claude Sonnet 4.6 message costs 550.

On DarkGPT, you do not have to pick once and for all: both sit in the same model selector from the Gold plan, and you switch in a click, even in the middle of a conversation.

The Claude and ChatGPT models available

DarkGPT offers five Claude models and two ChatGPT models, from 90 to 800 gems per message. Claude and ChatGPT 4.1 are included from Gold, ChatGPT 3.5 Turbo from Basic.

Thinking mode, which makes the AI reason step by step, exists on the Claude models and not on the ChatGPT models in the catalog. It is included from the Platinum plan.

Claude vs ChatGPT for writing: Claude has the edge

For a text that has to sound right, Claude Sonnet 4.6 is the best pick. ChatGPT 4.1 writes cleanly and clearly, but its style is easier to spot.

Claude varies its sentences, adapts its tone and holds the structure over long pieces: articles, short stories, speeches, cover letters. ChatGPT stays very efficient on functional texts.

• Claude Sonnet 4.6: polished writing, fiction, rewriting a text that falls flat.
• ChatGPT 4.1: product pages, meeting notes, clear emails, FAQs.
• ChatGPT 3.5 Turbo: rephrasing a sentence or finding a title in seconds.

Claude vs ChatGPT for coding

Claude for real projects, ChatGPT for small jobs. Claude Sonnet 4.6 is presented as the catalog’s flagship model for code, and Claude Sonnet 4.5 as rock-solid on long projects.

The Claude models read a whole file well, respect existing conventions and explain their choices. ChatGPT 4.1 remains a good generalist for an isolated function, an SQL query or a regular expression.

Tight budget? DeepSeek v4 Pro (150 gems), Kimi K2.7 Code (160 gems) or Devstral 2 (95 gems) code very well for less. Our comparison of the best AI models for coding puts them side by side.

Reasoning: Opus for the hard problems

For a multi-step problem, the Claude Opus range is the deepest in the catalog. ChatGPT 4.1 is enough for everyday reasoning, with no supplement.

Opus 4.5 reasons in depth, Opus 4.6 is faster and more precise, and Opus 4.7 is the most powerful model of the whole lineup. With Thinking mode, an Opus 4.7 message costs 1,050 gems: keep it for the real head-scratchers. The differences between Sonnet and Opus are covered in our Claude Opus and Sonnet guide.

How many messages a day on each plan

With Gold (3,000 gems a day), you get 13 ChatGPT 4.1 messages or 5 Claude Sonnet 4.6 messages a day. The math is simple: daily gems divided by the price of one message.

In real life you mix: a few Claude messages for the text that matters, ChatGPT or a cheaper model for the rest. Without a subscription, the Elite (8,500 gems, €59.99), Ultimate and Max packs include Claude; Essential and Premium cover everything except Claude. Every plan is on the pricing page.

Compare Claude and ChatGPT on the same prompt

Send exactly the same prompt to both models, then judge on precise criteria. Five minutes is enough to know which one suits you.

1. Write a complete promptContext, goal, expected format and length. A vague prompt makes any comparison pointless.
2. Send it to ChatGPT 4.1The cheaper of the two gives you a baseline for 220 gems.
3. Switch modelsPick Claude Sonnet 4.6 in the selector and paste exactly the same text.
4. CompareAccuracy, tone, format, useful length.
5. Keep the winnerFor that kind of task, you now know which model to open first.

Ready-to-copy test prompts

These five prompts bring out the differences in style, rigor and reasoning between Claude and ChatGPT.

• “Rewrite this paragraph to make it livelier, without adding information, in 120 words max.”
• “Here is an 80-line Python function: split it into small testable functions and explain each change.”
• “I’m torn between two job offers: here are the salaries, commutes and prospects. Weigh the pros and cons, then make a call.”
• “Write the opening scene of a dark crime novel, first person, in 300 words.”
• “Explain this error message to a beginner, then give the fix.”

Uncensored: when Claude or ChatGPT refuse, switch to Unfiltered mode

Claude and ChatGPT are both cautious by design. On a dark scene, a blunt opinion or a sensitive topic, either can refuse or water the answer down.

On DarkGPT, that’s not a dead end: you switch to Grok 4.2, DeepSeek v4 Pro or Qwen 3 235B in the same conversation for the part they dodge, then come back to Claude or ChatGPT for the rest. One account, one gem balance.

Adults 18+ only; illegal use remains banned by the terms.

Pitfalls to avoid

Most disappointments come from the wrong plan or a model that is too big for the task.

• Buying Basic to get Claude: Basic includes neither Claude nor ChatGPT 4.1. You need Gold, or an Elite, Ultimate or Max pack for Claude.
• Using Opus for everything: 800 gems per Opus 4.7 message, more than three times a ChatGPT 4.1 message. Move up only when the answer falls short.
• Turning on Thinking by reflex: +180 to +250 gems per Claude message, only useful on multi-step problems.
• Judging on a single try: compare on three or four questions typical of your own use.
• Feeding Claude a huge document: Gemini 2.5 Pro reads long documents for 180 gems; give Claude the extracted points instead.

Claude or ChatGPT: which one should you choose?

Choose Claude if you write or code seriously, ChatGPT if you want a versatile, cheaper assistant. In practice:

• You write articles, newsletters or fiction: Claude Sonnet 4.6, Gold plan.
• You code on a real project: Claude Sonnet 4.6 day to day, Opus 4.7 for nasty bugs.
• You want an everyday assistant on a small budget: ChatGPT 3.5 Turbo with Basic (€21.99/month).
• You want to compare both every day: Gold, which includes all 42 models.
• You use Claude heavily, with Thinking: Platinum, which doubles Gold’s gems.
• You do not want a subscription: an Elite pack, explained in our Claude without a subscription guide.

Frequently asked questions