Wednesday 9 PM, I'm writing a UK client email while brainstorming a product name

Just bouncing between those two tasks fried my brain. I figured — maybe I should pull both new models and run them for a week. I got stuck on this step too — I'd been using just one model before, and when work piled up I'd think "ugh, it kinda sucks," but maybe I just hadn't matched it to the right scene.

What these two models actually are, and who's using them

GPT-6 Sol dropped from OpenAI last month. The pitch is "long tasks, no lost thread" — they say it can chew through hundreds of pages in one go. Claude Opus 5.5 came out this week from Anthropic. The vibe is more "human-like" — replies feel like talking to an actual person.

My friend Anan (Anan, independent designer in Hangzhou, works out of a loft in an old converted factory in Xihu district, takes brand packaging gigs) uses Opus 5.5 as her "writing partner" — she asks for 5 headlines, picks one, then edits. "I stare at a blank screen all night; it spits out 10 in 30 seconds."

Another friend, Laozhou (Laozhou, runs a finance public account, 3 years in, daily 3000-word posts), tried GPT-6 Sol for a week. Long-form logic flowed fine, but it kept "adding drama" — he asked for an earnings report analysis and the AI invented a quote from an exec that never existed. He had to verify line by line.

Cost to replicate: money, time, bar to entry, first step

Money: Both are paid monthly, about $20/mo (around 140 RMB). Free tier works, with usage caps.

Time: Took me a full week to figure out the difference. My tip: pick one, run it for 3 days solid, then swap. Don't run both at once — your brain gets scrambled.

Technical bar: Zero. If you can type, you can use it. No API, no keys (treat those as "stuff only programmers need to know") — none of that.

First step: Open chat.openai.com or claude.ai, sign up free, and in the box type: "Write me an email to a client telling them the project is delayed by 3 days." See how it answers.

Advice by stage

If you're just starting out: I'd start with the free Claude. Get good at "ask the AI to brainstorm ideas." Money isn't the issue — staying focused is. You might spend under 5 hours a month on AI total.

If you already have 1-2 clients: Pay for both for one month — $20 each, about 280 RMB total. Give "writing emails" to one, "writing copy" to the other. At month's end, see which tasks you'd rather hand off.

If your team is scaling (3-5 people): Pick one as main, the other as backup. Don't let everyone figure it out solo — set the rule yourself: "X writes emails, Y handles long docs." Write it on one A4 page as an SOP (basically a "team playbook") and send it out. Saves countless meetings.

One last thing: both models are updating fast. Today's comparison could be outdated next month. If you don't feel like trying now, that's totally fine — wait until you're drowning, then start.