ChatGPT-6 or Claude Opus 5.5 is the question Tom’s Guide AI editor Amanda Caswell set out to answer this week, and her answer is not a single winner. Across seven everyday jobs she would hand four to Claude Opus 5.5 (planning, decisions, writing and analysis) and three to ChatGPT-6 (structured plans, learning and quick questions). A day earlier, her head-to-head test of five everyday prompts went four to one in Claude’s favour.
That is a useful verdict, but it leaves out two things a reader needs before acting on it. The first is what “ChatGPT-6” actually is. OpenAI sells no model by that name, and its new GPT-6 Sol and Luna models are, in OpenAI’s own words, “not yet available in Chat”. The second is what each pick costs, because Claude’s free plan does not include Opus at all, while ChatGPT’s unlimited free chats run on an older model.
This article sets out the seven-task scorecard and the five prompts behind it, explains where each assistant earns its place, pins down which model you really get in each ChatGPT and Claude plan, and turns the findings into a routing guide for everyday work. For the launches themselves, see our coverage of the AI price war between Anthropic and OpenAI and our wider AI models and tools hub.
Table of contents
- What Tom’s Guide Tested: ChatGPT-6 vs Claude Opus 5.5
- Where Claude Opus 5.5 Wins: Planning, Decisions, Writing and Analysis
- Where ChatGPT-6 Wins: Structure, Learning and Quick Answers
- What “ChatGPT-6” Actually Means Inside ChatGPT
- What ChatGPT-6 and Claude Opus 5.5 Cost for Everyday Use
- How to Choose Between ChatGPT-6 and Claude Opus 5.5 at Work
- What the Vendor Numbers Add to the ChatGPT-6 Verdict
- Frequently Asked Questions About ChatGPT-6 and Claude Opus 5.5
- References
What Tom's Guide Tested: ChatGPT-6 vs Claude Opus 5.5
Tom’s Guide published two linked pieces. The first, on 24 September 2026, ran both assistants through five everyday prompts. The second, on 25 September, turned the results into advice on which assistant to open for seven common jobs.
Two articles, one tester
Both pieces are by Amanda Caswell, the site’s AI editor. The launch context is simple: Anthropic released Claude Opus 5.5 on 22 September, and OpenAI released GPT-6 Sol and GPT-6 Luna about 90 minutes later, according to TechCrunch. The advice piece says the models “arrived within days of each other”; in fact they landed on the same afternoon.
Caswell frames the ChatGPT-6 versus Claude question as a matter of fit rather than rank. “Claude came out ahead in four of the five tests,” she writes, but “the results didn’t convince me to abandon ChatGPT.” Her bottom line is that you do not need a favourite: “You just have to know which one is best for the job you need.”
The seven-task scorecard
Here is how the advice piece splits the seven jobs, with the reason Tom’s Guide gives for each pick.
| Everyday task | Pick | Reason given |
|---|---|---|
| Planning something complicated | Claude Opus 5.5 | Anticipates the practical headaches of hosting |
| Making a decision | Claude Opus 5.5 | Weighs inconvenience, time and friction, not just price |
| Creating an organised plan to follow | ChatGPT-6 | Turns a vague goal into steps and schedules |
| Writing that sounds natural | Claude Opus 5.5 | Keeps the writer’s intent without sounding formulaic |
| Learning something new | ChatGPT-6 | Gets to the point and supports back-and-forth |
| Analysing information | Claude Opus 5.5 | Analyses rather than summarises a large pile of context |
| Everyday quick questions | ChatGPT-6 | Versatile default for dinner ideas, sums and dashboard lights |
The five prompts behind the verdict
The earlier test is where the evidence sits. Four of the five prompts went to Claude and one to ChatGPT-6, so the seven-task advice is kinder to ChatGPT than the test itself was.
| Prompt | Winner | What decided it |
|---|---|---|
| $150 party for 10 children, with a rain plan, two vegetarians and a peanut allergy | Claude | A host-ready plan that flagged cross-contamination |
| Rewrite a dull product announcement with banned words and no em dashes | Claude | Reframed features as benefits people feel |
| Choose between two holiday rentals for a family of five | Claude, “by a hair” | Did the fuel maths and spotted hidden fees |
| Spend a city’s $10 million on one of three options | Claude | Argued from what city budgets tend to neglect |
| Build a 30-minute evening system for a busy parent | ChatGPT-6 | A decision filter that protects mental bandwidth |
Put the two scorecards side by side and the gap is clear. In the seven-task guide Claude takes 4 of 7 jobs, or 57%. In the five-prompt test it took 4 of 5, or 80%.
Where Claude Opus 5.5 Wins: Planning, Decisions, Writing and Analysis
Claude’s four jobs share one trait: they reward judgment over speed. Caswell’s summary is that Claude “tends to keep digging”, and each of its wins shows that habit.
Planning something with many moving parts
The party prompt asked for a three-hour event for 10 children aged 8 to 11 on a $150 budget, with an indoor fallback, two vegetarian guests and a peanut allergy. Both plans worked. Claude’s went further: it addressed cross-contamination in bakery cakes and boxed mixes, and it spent $14 on canvas tote bags and $12 on fabric markers so that one purchase served as both the arrival craft and the party favour.
ChatGPT-6 had good instincts too. It budgeted $36 for three delivery cheese pizzas, which is easier for a host than supervising homemade ones, and it kept an emergency buffer. But Tom’s Guide judged its answer “a fragmented grocery list” next to Claude’s “turnkey, host-ready plan”.
Making a decision with more than one number
The rental prompt is the clearest example of the gap. Rental A costs $1,850 and sits a 10-minute walk from the beach. Rental B costs $1,500 but needs a 25-minute drive and $35 a day in parking. The family stays seven days, visits the beach twice a day and has three children.
The arithmetic is short. B saves $350 on the rent, but seven days of parking costs $245, which leaves a $105 saving. Claude then worked out the mileage and put the real weekly saving at $55 to $65. It also pointed out that cleaning fees, service fees and occupancy taxes could flip a $105 gap on their own.
The sharper point was behavioural. Loading three children into car seats four times a day, Claude argued, means the family will probably drop the second daily trip. ChatGPT-6 made the best single observation, that walking with heavy beach gear and small children can be harder than driving, but Claude won overall. “I can use a calculator myself,” Caswell writes. “What I need is another perspective.”
Writing that still sounds like you
For writing, Tom’s Guide says Claude “gets the edge” and that this “has been true for years”. In the rewrite test, the prompt banned em dashes, clichés and four words: “exciting,” “revolutionary,” “game-changing” and “seamless.” ChatGPT-6 kept every fact and produced a punchy, scannable version. Claude went further and rebuilt the announcement around what the calendar feature would save people at work.
That matches what Anthropic claims for the model. Its launch post says Claude Opus 5.5 “communicates more naturally than prior models”, that it “puts the most important information up front”, and quotes an early tester who said “it writes the way I do.” Caswell’s own use is editing rather than drafting: she hands Claude text she has written and asks it to find grammar slips, awkward transitions and gaps.
Analysing a pile of information
The fourth Claude job is reading a lot and saying what matters. “There’s a difference between summarizing and analyzing,” Caswell writes, and she adds that she has built a Claude Skill for fact-checking.
Anthropic’s evidence points the same way. In an internal test, 16 of 18 Claude Opus 5.5 research reports passed a grader that failed any invented figure or quote; neither Claude Fable 5.1 nor Opus 5 passed in any attempt. One customer, Hex, said the model “keeps digging past the first plausible answer.” Those are vendor results, but they describe the behaviour Tom’s Guide saw.
Where ChatGPT-6 Wins: Structure, Learning and Quick Answers
The three ChatGPT-6 jobs reward a different habit: getting to a usable answer quickly. “The brevity of ChatGPT-6 means less fluff,” Caswell writes, “which in my eyes is always a plus.”
Turning a vague goal into a plan you can follow
Tom’s Guide draws a neat line between its two planning categories. When Caswell is unsure what to do, she asks Claude. When she knows the goal but not how to organise it, she opens ChatGPT. The examples are workout schedules, study plans, cleaning routines, project timelines and step-by-step instructions.
That is also the one prompt ChatGPT-6 won in the test. Asked to build a 30-minute evening system for a parent of three with a full-time job, it produced a decision filter that kept “work, family, and life from cannibalizing each other.” Claude’s routine was good, and it named the mental load, but Tom’s Guide preferred the answer that asked less of an exhausted reader.
Learning something new
For learning, the case for ChatGPT-6 is conversational. Caswell asks for a simple explanation, then an analogy, then an example, then the one part she still does not follow, without starting over. She uses it to understand new technology, unfamiliar terms and background before reading primary sources.
OpenAI says the GPT-6 Sol and Luna models bring “more clarity, less jargon, fewer odd turns of phrase, fewer low-value details, and slightly shorter answers overall without losing substance.” That describes the style Tom’s Guide praises. It also says GPT-6 Sol makes about half as many factual mistakes as its predecessor, on a test set built from conversations where users had flagged errors, which OpenAI says is “not representative of typical usage”.
Everyday questions when you just want an answer
The last job is the quick one: dinner ideas, a fast sum, a dashboard warning light. Caswell says she still defaults to ChatGPT here, because it has become “a general-purpose assistant I can throw very different problems at throughout the day.” Claude may be the model she would deliberately choose for demanding work, while ChatGPT-6 is the one she opens “without thinking about it first.”
What ChatGPT-6’s wins have in common
All three ChatGPT-6 wins are jobs where the user already knows roughly what a good answer looks like. Structure, explanation and quick lookups reward a short, well-ordered reply. Claude’s wins are jobs where the user needs the assistant to notice something they have not. That is a better way to choose than any benchmark table.
What "ChatGPT-6" Actually Means Inside ChatGPT
This is where the Tom’s Guide verdict needs care. “ChatGPT-6” is a headline label, also used by Mashable, not a product you can select, and neither Tom’s Guide piece says which model, mode or plan produced its answers.
There is no model called ChatGPT-6
OpenAI’s GPT-6 family has three members: GPT-6 Astra, the flagship released on 3 September, and GPT-6 Sol and GPT-6 Luna, released on 22 September. Sol is the mid-tier model for complex work, and Luna is the small, cheap model for high-volume tasks. The Tom’s Guide test piece describes Sol as “the version designed for everyday work”, so it is the likeliest candidate, but it does not say so outright.
GPT-6 sits in Work and Codex, not Chat
OpenAI’s launch post is explicit. “GPT-6 Sol and GPT-6 Luna are available in ChatGPT Work and Codex starting today for all Plus, Pro, Business, Enterprise, and Edu users. Free and Go users can access GPT-6 Luna in the desktop app. These models are not yet available in Chat.”
TechRadar’s Graham Barlow confirmed what that looks like on a Plus account. Switching to the Work tab gave him “GPT-6 Luna High, GPT-6 Sol Light, GPT-6 Sol Medium, GPT-6 Astra Light and GPT-6 Astra Medium”. The ordinary Chat window still runs GPT-5.6 Sol on Plus. GPT-6 Pro, which is powered by Astra, is available in Chat on some higher plans.
| ChatGPT plan | Chat window | Work and Codex |
|---|---|---|
| Free and Go | GPT-5.6 Luna, unlimited text chats, Think button | GPT-6 Luna in the desktop app only, no published limit |
| Plus | GPT-5.6 Sol with a thinking slider | GPT-6 Luna, Sol and Astra at set effort levels |
| Pro, Business, Enterprise | GPT-6 Pro, powered by Astra, is available | GPT-6 Sol and Luna (Enterprise admins must enable them) |
Why the ChatGPT-6 label matters for the verdict
The distinction changes how to read the results. If Caswell ran her prompts in Chat, she was probably testing GPT-5.6 Sol, which OpenAI retuned on 6 August for “more direct responses” and “tighter formatting”. That would explain the brevity she credits to ChatGPT-6 just as well. If she ran them in Work, she tested GPT-6, but in a mode TechRadar says “can take considerably longer” because it is built for multi-step jobs.
Effort matters too. Since mid-September, Notebookcheck reports, asking ChatGPT to “think harder” no longer switches thinking level by itself on Plus and Pro, and Plus accounts see only three of the five slider steps. The same prompt can get a quick answer or a considered one depending on a setting the reviews do not record.
What ChatGPT-6 and Claude Opus 5.5 Cost for Everyday Use
Tom’s Guide closes with a practical tip: “when in doubt, go with ChatGPT first, since it offers endless chatting for free. It’s easier to hit your usage limit faster with Claude.” Both halves are true, but the free tiers do not give you either model from the test.
The free tiers are not equivalent
ChatGPT’s unlimited free chats were announced on 6 August and arrived the following week. OpenAI made GPT-5.6 Luna the default for Free and Go users and removed limits on text chats, while keeping separate limits for files, images, voice and image generation. So “endless chatting for free” is real, but it runs on GPT-5.6 Luna, not on the GPT-6 model Tom’s Guide tested. Free users can reach GPT-6 Luna in the desktop app, where OpenAI has not published a limit.
Claude’s free plan is stricter. Anthropic’s pricing table lists Sonnet and Haiku for Free users and marks Opus as “No”. A free Claude user therefore cannot try Claude Opus 5.5 at all.
What a paid seat costs
At the $20 level the two are level. ChatGPT Plus costs $20 a month. Claude Pro costs $20 a month, or $17 a month billed annually at $200 a year. Heavier users can move to Claude Max from $100 a month, with a choice of 5x or 20x Pro’s usage, or to ChatGPT Pro at $100 for 5x Plus usage or $200 for 20x. We covered OpenAI’s reported $500 tier in ChatGPT Pro Max.
| Tier | ChatGPT | Claude |
|---|---|---|
| Free | Unlimited text chats on GPT-5.6 Luna; GPT-6 Luna in the desktop app | Sonnet and Haiku only; no Opus |
| About $20 a month | Plus: GPT-5.6 Sol in Chat, GPT-6 in Work | Pro: Opus included; $17 a month if billed yearly |
| Heavy use | Pro at $100 (5x Plus) or $200 (20x Plus) | Max from $100, with 5x or 20x Pro usage |
Usage limits are moving in Claude’s favour
The limit gap Caswell mentions is real, but it narrowed with this launch. Anthropic says it is “increasing five-hour usage limits on Pro, Max, Team, and seat-based Enterprise plans” and giving subscribers a rate limit reset they can “save and use whenever you choose.” We explained how that works in Claude’s new limit reset button.
What the models cost to build with
For teams calling the models through an API, the list prices tell a clearer story than the consumer plans. Claude Opus 5.5 costs $4 per million input tokens and $20 per million output tokens, 20% below Opus 5. GPT-6 Sol costs $2 and $10, and GPT-6 Luna $0.10 and $0.50. GPT-6 Astra and Claude Fable 5.1 both cost $10 and $50.
Per token, GPT-6 Sol is half the price of Claude Opus 5.5. Anthropic’s counter is that Opus 5.5 uses fewer tokens per task, which is why it claims a 40% cost cut on typical workloads against a 20% cut in list price. We checked those claims in our Claude Opus 5.5 card review and our GPT-6 Sol and Luna card review.
How to Choose Between ChatGPT-6 and Claude Opus 5.5 at Work
The Tom’s Guide split carries over to office work with little change. The useful rule is to route by the kind of thinking the job needs, not by which subscription you already pay for.
Route by the job, not the brand
For a small business, most everyday AI use falls into a handful of patterns. The table below maps them to the Tom’s Guide findings, with one check worth running before trusting either answer.
| Work task | First pick | Check before using |
|---|---|---|
| Rewriting a sensitive client email | Claude Opus 5.5 | Every fact and commitment survived the rewrite |
| Comparing three supplier quotes | Claude Opus 5.5 | Hidden costs and contract terms were read, not assumed |
| Reviewing a long report or contract pack | Claude Opus 5.5 | Quoted figures match the source document |
| Planning an office move or event | Claude Opus 5.5 | Budget totals add up and constraints are respected |
| Writing a checklist or process steps | ChatGPT-6 | Steps are in an order a new starter could follow |
| Explaining a new tool to a colleague | ChatGPT-6 | Terms are defined and the example is correct |
| Quick lookups during the day | ChatGPT-6 | Anything that matters is confirmed at the source |
Use Claude Opus 5.5 when the job needs judgment
Pick Claude when the answer depends on trade-offs you have not spelled out: competing priorities, messy notes, a sensitive tone or a pile of documents. That is where Tom’s Guide saw it notice cross-contamination, abandoned beach trips and hidden fees without being asked.
Use ChatGPT-6 when you need structure or speed
Pick ChatGPT-6 when you already know the destination and need the route: a schedule, a checklist, an explanation or a quick fact. Its shorter answers are a feature here, and its free tier is the more generous one, as long as you remember the free chat window is GPT-5.6 Luna rather than GPT-6.
Run your own two-prompt test
The cheapest way to settle ChatGPT-6 or Claude Opus 5.5 for your own work is to repeat the Tom’s Guide method on two real tasks. Write one prompt that needs judgment and one that needs structure. Run each in both assistants, and write down the plan, the mode (Chat or Work in ChatGPT) and the thinking or effort setting. Score the answers against a short checklist before you read the other one.
If your team is weighing AI assistants as a business tool rather than a personal one, our AI strategy service can help set up that kind of evaluation, including data handling rules for each plan.
What the Vendor Numbers Add to the ChatGPT-6 Verdict
Benchmarks cannot tell you whether a party plan is thoughtful, but they do show where each company thinks its model is strong. Both launches came with tables, and both need reading carefully.
Anthropic’s own table has two losses
Anthropic’s launch table puts Claude Opus 5.5 first on seven of nine benchmarks. On GDPval-AA v2.1, a test of real-world work across 44 occupations, it scores 1846 Elo against 1542 for GPT-6 Astra. But Anthropic also publishes two rows where Astra wins: AutomationBench, 41.4% to 40.0%, and Terminal-Bench-Science, 64.6% to 58.7%. Anthropic adds that “benchmark margins have become a less reliable guide to real-world differences.”
The scores also carry a handicap. Anthropic ran its tests with the production safeguards switched on, so when they intervened, cybersecurity tasks were completed by Claude Opus 4.8, and biology and AI development tasks by Opus 5. Anthropic says this “likely reduces” the Claude Opus 5.5 results.
Independent scores favour Claude too
On 24 September, Artificial Analysis’s intelligence index put Claude Opus 5.5 at 57.6, ahead of GPT-6 Astra at 52.7, GPT-6 Sol at 47.5 and GPT-6 Luna at 37.3. That lines up with the Tom’s Guide result, although an intelligence index measures hard reasoning, knowledge and coding tasks, not how pleasant an answer is to read.
Why a handful of prompts still counts
Everyday use is not a benchmark. Most people ask short questions, want answers they can act on and judge the result by feel. A reviewer running realistic prompts captures things a leaderboard misses, such as whether a plan anticipates a rain delay or whether a rewrite still sounds like the person who wrote it.
The limits of one reviewer’s ChatGPT-6 test
The Tom’s Guide test is still one person, five prompts and one run each. The rental win was “by a hair”, AI answers vary from run to run, and the pieces do not record plan, mode or effort. Treat the four-to-one result as a strong hint about each model’s habits, not a measurement.
Frequently Asked Questions About ChatGPT-6 and Claude Opus 5.5
Is ChatGPT-6 a real model?
No. ChatGPT-6 is a shorthand used in headlines. OpenAI’s models are GPT-6 Astra, GPT-6 Sol and GPT-6 Luna, and on 22 September OpenAI said Sol and Luna were “not yet available in Chat”.
Can I use Claude Opus 5.5 for free?
Not in the Claude apps. Anthropic’s pricing page lists Opus as unavailable on the Free plan, so you need Pro at $20 a month or Max from $100.
Which is better for writing?
Tom’s Guide picks Claude Opus 5.5 for writing that sounds natural and for feedback on your own drafts. ChatGPT-6 produced a clean, scannable rewrite but lost the rewrite test.
Which is better for planning?
It depends on the kind of planning. Claude Opus 5.5 won for plans with many constraints and trade-offs, while ChatGPT-6 is the pick for turning a clear goal into steps and schedules.
Does ChatGPT-6 come with unlimited free chats?
Not exactly. Free and Go users have had unlimited text chats since August, but those run on GPT-5.6 Luna. GPT-6 Luna is available to them only in the desktop app, where OpenAI has not published a limit.
Should a business pay for both?
For a small team, one paid seat of each costs about $40 a month and covers both kinds of work. Decide after a short trial on your own tasks, and check each plan’s data and training settings before sharing client material.
References
I tested ChatGPT-6 vs Claude Opus 5.5 with 5 everyday prompts (Tom’s Guide)
Introducing Claude Opus 5.5 (Anthropic)
Introducing GPT-6 Sol and Luna (OpenAI)
Improving GPT-5.6 Sol in ChatGPT and expanding access to GPT-5.6 Luna for free users (OpenAI)
ChatGPT got GPT-6, but you can’t use it in Chat (TechRadar)
ChatGPT Free gets GPT-6 Luna, but only in the desktop app (Notebookcheck)
ChatGPT stops switching to Thinking by itself on Plus and Pro (Notebookcheck)
OpenAI launches GPT-6 Sol and Luna, boasting lower cost and fewer mistakes (TechCrunch)
ChatGPT brings unlimited text chats to free users (TechCrunch)
ChatGPT-6 Sol and Luna are here: Pricing and benchmarks data (Mashable)
OpenAI cuts GPT-6 prices in half with Sol and Luna (The Next Web)
More AI coverage: explore Progressive Robot's AI Models, Tools & Releases hub — hands-on reviews, setup guides and benchmarks in one place.
