ChatGPT Review
The most versatile AI assistant, now powered by GPT-6 Astra — from writing and coding to deep research and autonomous agents.
At a Glance
Overview
ChatGPT is the AI assistant that started it all. Launched by OpenAI in November 2022, it introduced mainstream users to conversational AI and hasn't looked back. As of September 2026, ChatGPT has evolved through six major model generations. The lineup is now led by GPT-6 Astra (released September 3, 2026), which supersedes GPT-5.6 Sol as OpenAI's top model: a 1.05M-token context window, a knowledge cutoff of April 30, 2026, and five reasoning effort levels (low, medium, high, xhigh, and max). It is rolling out to Plus, Pro, Business, Enterprise, and the API (gpt-6-astra), with GPT-6 Astra Pro on the Pro, Business, and Enterprise tiers. Behind it sits the GPT-5.6 family: Sol (the flagship of that generation, with Sol Pro on the Pro tiers), Terra (balanced), and Luna (fast and cheap — the everyday default for Free and Go since August 6, 2026, with unlimited text chats). OpenAI retired the GPT-4 and GPT-4o models from ChatGPT in early 2026, and legacy reasoning models (o3, o3-pro, o1, o1-pro) remain listed for developers.
With over 400 million weekly active users, it is by far the most widely used AI chatbot. The free tier now gives you unlimited text chats with GPT-5.6 Luna (unlimited text arrived on Free and Go in August 2026) plus a Think button for harder questions, 5 Deep Research tasks a month, and — in the US and Europe — ads. ChatGPT Plus ($20/month) unlocks GPT-5.6 Sol with the effort slider, plus GPT-6 Astra as it rolls out, higher usage limits, file uploads, image generation, Codex for coding, and Deep Research. The Go plan ($8/month) fills the gap for budget-conscious users who want more than free but don't need the full Plus feature set.
For people who need an AI assistant that can write emails, debug code, brainstorm ideas, research topics, and explain complex concepts in plain English — ChatGPT is still the default choice in 2026. The effort slider is a smart design move: it doesn't switch models, it changes how much compute the current model spends — one interface, depth on demand. But with competitors like Claude and Gemini catching up fast, the gap has narrowed considerably.
Key Features
- GPT-6 Astra — the new flagship, released September 3, 2026, with a 1.05M-token context window, a knowledge cutoff of April 30, 2026, and five reasoning effort levels (low, medium, high, xhigh, and max). It is the first OpenAI model rated Critical on cybersecurity capability under the Preparedness Framework. Rolling out to Plus, Pro, Business, Enterprise, and the API (gpt-6-astra), with GPT-6 Astra Pro on the Pro, Business, and Enterprise tiers. Usage counts inside your existing plan allowance, and extra usage can be bought as credits. Enterprise admins have to enable it — it is off by default at launch.
- GPT-5.6 family — GPT-5.6 Sol (flagship of the GPT-5.6 generation for Plus and Pro, with Sol Pro on the Pro tiers — handles both instant responses and deeper reasoning via an effort slider) plus Terra (balanced) and GPT-5.6 Luna (fast default for Free and Go tiers, unlimited text chats with a Think button). The effort slider replaces the old separate Thinking model — drag it up for harder problems, keep it low for quick answers. GPT-5.6 Sol also adds Ultrafast mode (14x speed, API preview as of August 13, 2026).
- Codex — OpenAI's coding agent is now generally available, with terminal access, file I/O, and multi-file project understanding. Write features, fix bugs, navigate codebases, and propose pull requests. Available on Plus, Pro, Business, and Enterprise. New in 2026: @Codex in Slack (invoke Codex from any Slack thread), the Codex SDK (embed Codex in your own apps), new admin tools, and Record & Replay on the macOS Codex app (Business tier, June 18, 2026) — record a workflow once and turn it into a reusable skill.
- 1.05M-token context window — GPT-6 Astra processes massive documents, entire codebases, or book-length content in a single conversation, and the $100 Pro tier adds a 1M-token context window. Codex supports up to 1M tokens.
- Deep Research — autonomous multi-step research that browses the web, synthesizes findings, and produces cited reports. A game-changer for analysts and researchers: Free gets 5 tasks a month, Plus gets 25, and the top Pro tier is unlimited.
- Agent Mode — ChatGPT can now complete multi-step tasks autonomously: book flights, manage calendars, fill out forms, and interact with websites. Available on Plus and above — not on Free or Go.
- Multimodal input — upload images, PDFs, spreadsheets, and documents; ChatGPT reads, analyzes, and reasons about all of them in a single conversation.
- Custom GPTs + Projects — create purpose-built AI assistants for specific tasks, organize conversations into projects, and set recurring tasks. Google Drive integration in Library launched August 13, 2026 for seamless file access. Available on Plus and above.
- ChatGPT Images 2.0 — state-of-the-art image generation with 2K resolution, native text rendering, and a reasoning step that interprets prompts before generating. Launched April 2026, replacing DALL-E entirely. Available on Plus and Pro tiers (limited on free).
- For developers — Beyond the consumer app: the Agents SDK for building agentic apps, Background Mode for long-running tasks, a Deep Research API for programmatic access, and Ultrafast mode (14x speed, API preview August 13, 2026). GPT-6 Astra is available in the API as gpt-6-astra, alongside the GPT-5.6 family: gpt-5.6-sol at $4/$20 per million tokens, gpt-5.6-terra at $2/$12, and gpt-5.6-luna at $0.20/$1.20.
- Voice and vision — real-time voice conversations with natural speech, plus the ability to analyze photos, screenshots, and live camera input.
- Memory and personalization — ChatGPT remembers preferences and context across conversations, with user control over what's stored and when to forget (Plus feature).
Pricing
ChatGPT's pricing has evolved significantly in 2026, with five consumer tiers and two business plans. The free tier is now genuinely generous — you get unlimited text chats with GPT-5.6 Luna plus a Think button for harder questions, web browsing, and basic voice features, plus 5 Deep Research tasks a month. It now carries ads in the US and Europe. It's enough for casual users who ask questions throughout the day without hitting artificial caps.
Paid tiers unlock progressively more:
- ChatGPT Go ($8/month) — Budget tier introduced in 2026. GPT-5.6 Luna with the Think button, unlimited text chat, basic file uploads, and web browsing. No Codex, no Deep Research, and no Agent Mode. Best for students and light users who want more than the free tier.
- ChatGPT Plus ($20/month) — The sweet spot. GPT-5.6 Sol with the effort slider (instant responses or deep reasoning, your choice) plus GPT-6 Astra as it rolls out, Codex for coding, Deep Research (25 tasks a month), Agent Mode, ad-free use, ChatGPT Images 2.0, Custom GPTs, file uploads, and priority access during peak times. This is what most professionals should get.
- ChatGPT Pro ($100/month) — 5x Plus usage and a 1M-token context window, with Sol Pro and the full Plus feature set including Agent Mode for autonomous task completion. The middle step before the top tier.
- ChatGPT Pro ($200/month) — 20x Plus usage with everything unlocked: GPT-6 Astra Pro at maximum effort, all models, unlimited Deep Research, expanded memory, and early access to research previews. Built for power users: developers, researchers, and executives.
- Business ($25/user/month, or $20/user/month billed annually, minimum 2 seats) — Team workspace with admin and SSO controls, shared Custom GPTs, usage analytics, access to all models, and Codex access.
- Enterprise — Custom pricing with SSO, data encryption, dedicated support, audit logs, usage analytics, and access to all models. GPT-6 Astra is off by default at launch and has to be enabled by an admin. For organizations with compliance and security requirements.
For most individual users, the $20 Plus plan hits the sweet spot between capability and cost. The Go plan at $8/month is worth considering if you mainly want unlimited text chat on a budget. The $100 Pro tier is the cheapest route to Sol Pro and 1M-token context, while the $200 tier only makes sense if you're doing heavy coding, deep research daily, or need maximum usage across every model.
Pros
- GPT-6 Astra is the most capable consumer AI model available — a 1.05M-token context window and five effort levels let you trade speed for depth on any query
- Free tier gives you unlimited GPT-5.6 Luna text chats at zero cost — genuinely usable for everyday work
- Codex is a legitimate coding agent that can navigate codebases, fix bugs, and propose PRs
- Deep Research produces genuinely useful multi-page cited reports from web research
- 1.05M-token context window handles enormous documents and codebases without splitting
- Multimodal capabilities are best-in-class: text, images, PDFs, spreadsheets, and voice in one interface
- Available on every platform: web, iOS, Android, macOS, Windows, plus API access
- Custom GPTs and Projects let you build specialized assistants and organize work into persistent workspaces
- Go plan at $8/month makes ChatGPT accessible to budget-conscious users who need more than free
- Regular model updates — GPT-6 Astra shipped on September 3, 2026, hot on the heels of the GPT-5.6 Sol and Luna launch in August
Cons
- Pro tiers at $100–$200/month are steep — the top tier is only worth it for heavy daily users
- Free-tier chats in the US and Europe now carry ads
- Rate limits on Plus can still be frustrating during heavy use (slower fallback models, cooldowns)
- The effort slider at high settings can be slow — you trade speed for reasoning depth on complex queries
- Can be confidently wrong on technical or niche topics — Deep Research helps but fact-checking is still required
- Privacy concerns: conversations may be used for training by default (requires manual opt-out in settings)
- Competitors are closing the gap — Claude matches or beats ChatGPT on long-form writing, and Gemini has stronger Google ecosystem integration
- Occasional downtime during peak usage or model updates
Use Cases
Verdict
ChatGPT is still the AI assistant to beat in 2026. The free tier offers unlimited GPT-5.6 Luna text chats — enough for anyone to see the value, ads aside — and the $20/month Plus plan unlocks GPT-5.6 Sol with the effort slider plus GPT-6 Astra as it rolls out, a genuinely powerful productivity tool. The multimodal capabilities, 1.05M-token context window, and third-party integrations give it an edge that competitors are still chasing.
That said, it's not perfect. Rate limits on the Plus tier can annoy power users, occasional factual errors demand verification, and the top Pro tier's $200/month price tag puts it out of reach for casual users. If you're comparing tools, Claude edges ahead on long-form writing quality and Perplexity wins at research — but ChatGPT remains the best all-arounder.
For most people who want a single AI tool that does everything reasonably well, ChatGPT is the right place to start.
Frequently Asked Questions
Is ChatGPT free?
Yes, the free tier gives you unlimited text chats with GPT-5.6 Luna (OpenAI's default since August 6, 2026) plus a Think button for harder questions and 5 Deep Research tasks a month — though it now runs ads in the US and Europe. ChatGPT Plus costs $20/month for GPT-5.6 Sol with the effort slider (and GPT-6 Astra as it rolls out), higher limits, Codex, Deep Research, ChatGPT Images 2.0, Agent Mode, and priority access. There's also a Go plan at $8/month for budget-conscious users.
Which ChatGPT model should I use?
If you're on Free or Go, GPT-5.6 Luna is your default — fast and unlimited for everyday questions. Tap the Think button when you need deeper reasoning. If you're on Plus or Pro, GPT-6 Astra is the new flagship (rolling out now) and GPT-5.6 Sol is still excellent: both run through the effort slider, so keep it low for quick answers and drag it up for complex reasoning, long-form writing, coding, and research. The slider doesn't switch models — it changes how much compute the current model spends. Most users should keep it low for speed and only crank it up when they need more depth.
Can ChatGPT browse the internet?
Yes, web browsing is available on all tiers including free (with limits). It can search for real-time information, current events, and recent data. Plus and Pro users get more browsing queries per day and access to Deep Research, which autonomously researches topics and produces cited reports.
Does ChatGPT store my conversations?
By default, OpenAI may use your conversations to improve models unless you opt out in settings. You can disable chat history and model training in your account settings. Enterprise plans have stronger data privacy guarantees with no training on your data.
Should I use ChatGPT or Claude?
ChatGPT is more versatile — Codex for coding, Deep Research, multimodal input, image generation, and Agent Mode give it a broader toolkit. Claude excels at long-form writing with a more natural, nuanced tone. If you need an all-in-one tool with the best coding support, go with ChatGPT. If your primary use is writing, analysis, and document work, Claude is worth a serious look — the gap in writing quality is real.
Can ChatGPT generate images?
Yes, via ChatGPT Images 2.0 (launched April 2026, replacing DALL-E entirely). This new model generates 2K-resolution images with accurate text, multilingual support, and a reasoning step that interprets prompts before creating. Available on Plus and Pro plans, with limited access on free. Go users do not get image generation.