GPT-5 in 2026: what it is, what's new, and how to try it free
GPT-5 is no longer a single model — it is a whole generation. Since the launch in August 2025, OpenAI has iterated fast: GPT-5.1, GPT-5.5, and now the GPT-5.6 family power everything from ChatGPT's free tier to enterprise research tools. This page tracks where things stand, what actually changed since GPT-4, and how to try a GPT-family AI right now — the chat above works without an account.
This page is updated as announcements land. Last reviewed: August 2026.
GPT-5 today: where things stand
The current generally available release is the GPT-5.6 family, launched on July 9, 2026, in three tiers: Luna for fast, cost-sensitive work, Terra for balanced everyday use, and Sol for the hardest problems. In ChatGPT, GPT-5.5 Instant remains the default for quick answers, while paid plans can reach GPT-5.6 Sol through reasoning settings. August 2026 alone brought an ultrafast Sol preview and a security-focused GPT-5.6-Cyber variant — the release cadence has never been faster. Here is the short version of how we got here:
| Date | Release | What changed |
|---|---|---|
| August 7, 2025 | GPT-5 | Launch for Free, Plus, Pro, and Team users, with a router that switches between fast and deep-reasoning modes |
| November 12, 2025 | GPT-5.1 | Faster responses, a warmer default tone, and explicit Instant and Thinking modes |
| February 13, 2026 | Model cleanup | GPT-4o, GPT-4.1, o4-mini, and the original GPT-5 retired from ChatGPT as the 5.x line took over |
| April 23, 2026 | GPT-5.5 | New mid-generation flagship; GPT-5.5 Instant became the free default for all users on May 5 |
| July 9, 2026 | GPT-5.6 family | Three tiers — Luna, Terra, and Sol — with Sol reserved for paid plans via reasoning settings |
One naming note, since searches for "ChatGPT 5" and "GPT-5" both land here: GPT-5 is the model family, and ChatGPT is the product you talk to. There is no separate "ChatGPT 5" app — when people say it, they mean ChatGPT running a GPT-5-family model, which is exactly what every ChatGPT user gets today.
What changed since GPT-4
GPT-4 (2023) and GPT-4o (2024) made AI chat mainstream, but they forced a choice: a fast conversational model or a slow reasoning one. GPT-5's core idea was to end that split. A built-in router decides per question whether to answer instantly or think step by step — no model picker gymnastics required. On top of that, the GPT-5 generation brought:
- Stronger math, science, and coding — GPT-5 posted 94.6% on the AIME 2025 math benchmark and 74.9% on SWE-bench Verified at launch
- Fewer confident wrong answers, with the model more willing to say what it does not know
- Better long-task behavior: following multi-step instructions and using tools without losing the thread
- A family approach — sizes and tiers for different budgets instead of one monolithic model
The transition is now complete: OpenAI retired GPT-4o, GPT-4.1, and the rest of the GPT-4-era lineup from ChatGPT in February 2026, with GPT-4o fully gone across all plans by April 2026. If you are searching for GPT-4 in 2026, what you will actually use — anywhere — is a GPT-5-family model.
How to access GPT-5
Through OpenAI, access depends on how much you pay. ChatGPT's free tier includes GPT-5.5 Instant as the default with usage caps. A budget Go tier raises those limits, Plus ($20/month) adds access to stronger reasoning modes, and Pro ($200/month) targets power users who want the most capable settings with the fewest restrictions. Developers can reach the full GPT-5.6 family through the API, priced per token by tier — and OpenAI has been adjusting those prices frequently, including a Sol price cut in August 2026. ChatGPT itself is available on the web and through official iOS and Android apps.
All of those paths require an OpenAI account — and the best models require a subscription. If your goal is simply to use a strong GPT-family AI for everyday work, there is a shorter path, covered below.
GPT-5 vs other frontier models
GPT-5.6 is not alone at the frontier. Anthropic shipped its Claude 5 generation through 2026, topped by Claude Opus 5 in July, and Claude models are frequently the pick for coding agents and long-form writing. Google's Gemini 3 series counters with very large context windows and aggressive pricing. Depending on which benchmark you read this week, any of the three can be "number one."
The honest takeaway: for drafting emails, summarizing documents, explaining concepts, or fixing a paragraph, all frontier models are more than good enough, and the differences you will feel are about access — price, limits, and sign-up friction — more than raw intelligence. That is why a free ChatGPT alternative makes sense for everyday tasks.
Try a GPT-family AI without an account
The chat at the top of this page runs on state-of-the-art language models, including OpenAI's GPT family. To be clear: Free AI Chat is an independent service, not OpenAI — which is exactly why there is no sign-up wall. Ask your first question right now: draft an email, summarize an article, debug a snippet, or explain a concept. No email, no password, no card. If you want the full story on skipping registration, see ChatGPT without login.
Frequently asked questions
Is GPT-5 free?
Partly. ChatGPT's free tier runs on the GPT-5 family — GPT-5.5 Instant became the default for all users in May 2026 — but free usage is capped, and the strongest models, like GPT-5.6 Sol, sit behind paid plans. If you want to try a GPT-family model with no account at all, the chat at the top of this page is free and starts instantly.
What is the newest GPT-5 model?
As of August 2026, the newest generally available release is the GPT-5.6 family, launched on July 9, 2026, in three tiers: Luna (fast and low-cost), Terra (balanced), and Sol (the most capable). OpenAI keeps shipping variants on top of it — an ultrafast Sol preview and a cybersecurity-focused GPT-5.6-Cyber both appeared in August 2026.
GPT-5 vs Claude — which should I pick?
There is no universal winner. OpenAI's GPT-5.6 line and Anthropic's Claude 5 generation trade places depending on the benchmark: Claude models are often preferred for coding agents and long-form writing, while GPT-5.6 is very strong across math, science, and tool use — and Google's Gemini 3 series competes with both on price and context size. The honest advice: try each one on your real tasks. Ten minutes of hands-on testing beats any leaderboard.
Can I use GPT-5 without a ChatGPT account?
ChatGPT requires an OpenAI account for its full feature set. If you would rather skip sign-up entirely, Free AI Chat runs on state-of-the-art language models, including OpenAI's GPT family — the chat at the top of this page works the moment it loads, no account and no card.
Is GPT-4 still available?
Not in ChatGPT. OpenAI retired GPT-4o, GPT-4.1, and the other GPT-4-era models from ChatGPT on February 13, 2026, with GPT-4o fully removed across all plans by April 3, 2026. Some older models remained available to developers through the API, but for everyday users the GPT-4 era has ended — everything now runs on the GPT-5 family.