Four launches in one week is a lot of noise for anyone trying to keep up. The good news is that you can skip the benchmark arguing. When the top models all clear the same bar, the differences a beginner can act on come down to three plain things: what it costs, where it lives, and whether it chats or does. Sort by those and the choice gets easy.
The four models, at a glance
Pulled from the sources linked below, checked on 11 September 2026. Where a company has not published a consumer price, this table says so rather than guessing.
| Model | What it is for | Price tier | Where it lives |
|---|---|---|---|
| Claude Fable 5.1 | Frontier model for coding and knowledge work | Premium, about $10 per million input tokens | Claude apps and Claude Code |
| Gemini 3.8 Flash | The cheap, fast workhorse tier | About $0.75 per million input tokens, introductory through 31 Dec 2026 | Inside Google: the Gemini app, AI Mode, Sheets, AI Studio, the API |
| Meta Muse Spark 1.3 | Powers Muse, an agent that takes actions for you | A free tier plus paid plans | US only, on iOS, Android and muse.ai |
| GPT-6 Astra | OpenAI's new flagship model | No public consumer per-token price | ChatGPT Plus, Pro, Business, Enterprise, the API and AWS |
The headline intelligence scores across these have largely converged, which is exactly why the table above sorts on the things that still differ. One of them, Muse, is a genuinely different kind of tool, and it is the one worth understanding first.
Pick by three plain questions
The smartest-model race matters less for a beginner now, so choose on the parts you can feel day to day. Answer these three in order and you will land on the right one.
- How much do you want to pay? If cost is the deciding factor, Gemini 3.8 Flash is the cheap tier, with an introductory API price of about $0.75 per million input tokens through 31 December 2026. Claude Fable 5.1 sits at the premium end, about $10 per million input tokens (check the page, this can change). That gap is real money once you use a tool a lot, so start here.
- Where do you already work? The best model is usually the one already in front of you. Gemini 3.8 Flash lives inside Google, in the Gemini app, AI Mode, Sheets, AI Studio and the API. GPT-6 Astra arrives on your ChatGPT plan if you pay for one. Fable 5.1 is the premium option inside Claude. Staying where your files and habits already are beats switching apps to chase a benchmark.
- Do you want a chatbot, or something that does things? Three of the four are models you prompt. Meta Muse Spark 1.3 is the exception. It powers Muse, a personal agent that takes actions such as sending emails, sorting travel and paying bills, and it runs from its own isolated secure cloud VM. If you want something that acts rather than answers, that is the one to look at, keeping in mind it is US only for now.
The one that is genuinely different
Muse is the standout because it changes the job. A chatbot waits for your next prompt. Muse takes an instruction and goes off to do the task, working from a secure cloud machine of its own, then comes back with it done. That is a different relationship with a tool, and it is worth trying on a low-stakes errand first so you can watch how it behaves before you trust it with anything that matters. Meta's announcement covers what it can reach and how the secure VM works: introducing Muse.
If you already use Claude
Fable 5.1 is the premium tier, built for coding and knowledge work. Two things beginners ask about it have their own guides, so this one will not repeat them: which Claude model to reach for, and how Fable compares with GPT-6 Astra head to head. If you are weighing those, read which Claude model to use and Claude Fable 5.1 vs GPT-6 Astra. Anthropic's own announcement is here: Claude Fable and Mythos 5.1.
The official pages, so you can check for yourself
Every figure above comes from the linked source. Read it before you spend money, because tiers and prices are the parts most likely to have moved since this was written.
| Model | Announced | Source |
|---|---|---|
| Claude Fable 5.1 | Sept 2026 | anthropic.com |
| Gemini 3.8 Flash | 2 Sept 2026 | 9to5google.com |
| Meta Muse Spark 1.3 | 2 Sept 2026 | about.fb.com |
| GPT-6 Astra | 3 Sept 2026 | deploymentsafety.openai.com |
Where the line is
- The honest bit: prices and tiers move fast, so check the official page before you pay. Gemini's $0.75 figure is an introductory API price through 31 December 2026, and Meta and OpenAI have not published a consumer per-token price for Muse or Astra, so this guide does not quote one.
- Muse is US only for now. If you are outside the US, the action-taking option is not available to you yet, so plan around the three you can actually reach.
- The specs will shift again. These four landed in a single week. Treat any headline benchmark as a snapshot, and pick on price, where you work, and chat-versus-do, because those hold up longer than a score.
Frequently asked
Which of the four is the cheapest?
Gemini 3.8 Flash is the cheap tier, with an introductory API price of about $0.75 per million input tokens through 31 December 2026. Claude Fable 5.1 is the premium tier at about $10 per million input tokens. Meta and OpenAI have not published a consumer per-token price for Muse Spark or GPT-6 Astra, so there is no fair figure to compare them on yet.
Which one takes actions for me instead of just chatting?
Meta Muse Spark 1.3 powers Muse, a personal AI agent that takes actions such as sending emails, sorting travel and paying bills from its own isolated secure cloud VM. The other three are models you prompt inside a chat or an app. Muse is rolling out in the US on iOS, Android and muse.ai with a free tier plus paid plans.
Do I need to switch models to the newest one?
No. For most beginner work the smartest-model race matters less than which app you already sit in. If you live in Google, Gemini 3.8 Flash is already there. If you pay for ChatGPT, GPT-6 Astra arrives on your plan. If you use Claude, Fable 5.1 is the premium option. Switching apps to chase a headline benchmark rarely pays off.
Can I use any of these for free?
Gemini 3.8 Flash sits inside Google products that include free access such as AI Mode, and Muse offers a free tier plus paid plans in the US. GPT-6 Astra was announced for ChatGPT Plus, Pro, Business and Enterprise with no public consumer per-token price, and Fable 5.1 is a premium tier. Prices and tiers move fast, so check the official page before you decide.
Do this now
Answer the three questions for yourself: what you want to pay, where you already work, and whether you want it to chat or to do. That lands you on one to open tonight. Try it on one real task, not a toy prompt, and you will know within an hour whether it fits how you work.
Next, if the head-to-head on the two flagships is what you are after, read Claude Fable 5.1 vs GPT-6 Astra.