AI tools·Chat models·Global
ChatGPT
The world's leading AI platform, upgraded to GPT-6 with adaptive reasoning and autonomous multi-agent execution.
Compiled through 2026-09
- Vendor
- OpenAI
- Started
- 2015
- China availability
- Overseas accessRequires overseas network access
- Pricing tier
- Free tier
- Current flagship
- GPT-6 (Frontier / Omni-Agent)
- Website
- chatgpt.com
Evaluation, Pros & Cons
Editorial score based on public benchmarks and community feedback — not a third-party benchmark result
Key Advantages
- Native multi-agent collaboration with adaptive reasoning depth (dynamic ms to deep search)
- End-to-end full modality with ~40% lower hallucination rate than GPT-5 series
Limitations & Caveats
- Autonomous multi-agent workflows and deep reasoning consume significant compute quota
Overview
Launched by OpenAI in Nov 2022, ChatGPT brought frontier AI to hundreds of millions. Following GPT-4, GPT-4o, o-series reasoners, and GPT-5, OpenAI released the milestone GPT-6 in September 2026. GPT-6 fuses adaptive deep reasoning, autonomous agent orchestration, and full-modality into a unified productivity core.
Direction
Beyond GPT-6, OpenAI is advancing long-horizon cross-system execution, ultra-low latency real-world perception, and fully autonomous engineering agents.
Version history
Sep 2026
LatestGPT-6
Next-gen multimodal reasoning & autonomous agent flagship.
View details
New capabilities
- Adaptive deep reasoning computing
- Native multi-agent autonomous collaboration
- End-to-end full modality with ultra-low hallucination rate
What got stronger
- Breakthroughs in scientific research, formal verification, and system architecture
- 40% lower hallucination rate than GPT-5 series with high long-horizon stability
Version notes
Launched in September 2026, GPT-6 represents OpenAI's milestone convergence of frontier LLMs, adaptive reinforcement reasoning, and autonomous multi-agent systems. The model autonomously balances latency and reasoning depth, while natively orchestrating specialized sub-agents for parallel development, research synthesis, and self-testing.
Jul 2026
GPT-5.6 Sol / Terra / Luna
Tiered models across ChatGPT, Codex, and API.
View details
New capabilities
- Sol / Terra / Luna tiers by quality and cost
- Same-day availability in ChatGPT, Codex, and API
- Multi-agent work, longer context, and coding loops
What got stronger
- You don’t have to run every request on the priciest SKU
- Coding (Codex) and chat share the new base
Version notes
GPT-5.6 GA’d on 9 July 2026. Sol is quality, Terra is balanced, Luna is cheap high-QPS. The practical change is picking a tier per job inside one product, not a single Plus knob. Video stays on Sora; coding on Codex.
Aug 2025
GPT-5
Unified chat + reasoning flagship.
View details
New capabilities
- Unified chat and reasoning in one flagship generation
- Longer jobs, better tool use, early agents
- Shared base for ChatGPT, Codex, and the API
What got stronger
- No longer pick chat fluency or exam skill
- More complete planning on messy projects
Version notes
GPT-5 was sold as one line: 4o-style multimodal chat plus o-series thinking. It was OpenAI’s 2025 flagship story and the setup for the tiered GPT-5.6 family in 2026.
Sep 2024
o1-preview
RL reasoner; big jump on math and code.
View details
New capabilities
- Explicit think-then-answer reasoning
- Big jump on contest math, code, and science
- Set up the o-series / GPT-5 reasoning path
What got stronger
- Hard problems were less likely to derail in one step
- Spends more compute for accuracy—exams and engineering
Version notes
o1-preview sold RL reasoning as a product: slower, stepwise answers. Wrong for chit-chat; right for proofs, debugging, and plans. Later o3 and GPT-5 kept the “thinking budget” idea.
May 2024
GPT-4o
Realtime voice/vision; free-tier access.
View details
New capabilities
- Realtime voice you can interrupt
- Realtime vision of screens and cameras
- Free-tier access to 4o
What got stronger
- Far more natural than speech-to-text then chat
- Multimodal went from looking at images to talking over them
Version notes
The “o” in GPT-4o is omni: one model for text, audio, and images. Realtime voice changed the product bar from typing to a phone-like assistant. Opening it on the free tier made 4o the de-facto default for most people.
Nov 2023
GPT-4 Turbo
Longer context, lower price; GPTs at DevDay.
View details
New capabilities
- 128K-class longer context
- Lower API price for app builders
- GPTs: configurable specialist chat apps
What got stronger
- Same quality, cheaper, more room for long docs
- Builders could wrap a workflow into one GPT
Version notes
GPT-4 Turbo at DevDay meant longer context, lower price, and fresher knowledge. GPTs let people ship instruction-plus-knowledge mini-apps. For developers this was the rung that made ChatGPT product-shaped.
Mar 2023
GPT-4
Multimodal understanding; ChatGPT Plus flagship.
View details
New capabilities
- Early vision understanding in chat
- Stronger exams, law, and code reasoning
- Flagship model for ChatGPT Plus
What got stronger
- Much better instruction-following than 3.5
- Longer, more professional documents
Version notes
GPT-4 moved chat from chatting to getting work done: math, code, and exams jumped, and images entered the loop. Context was still limited and it was slow/expensive, so it stayed a Plus flagship rather than the free default.
Nov 2022
ChatGPT launch
GPT-3.5-based consumer chat.
View details
New capabilities
- Web chat without running your own API
- Multi-turn follow-ups and revisions
- Plus subscription turned research models into a product
What got stronger
- Better long-form writing and code drafts than a search box
- First stable GPT-3.5 experience for non-developers
Version notes
ChatGPT launched in November 2022 on GPT-3.5. It wrapped a completion API as turn-based chat and made generative AI a consumer habit. No live browsing or voice yet; writing, explaining, and beginner coding were the strengths. Hallucinations and a stale cutoff were real, but the interaction pattern became the template.