GPT (OpenAI)
Overview
GPT Series is OpenAI's family of large language models (LLMs). Since the launch of ChatGPT in 2022, they have become the de facto standard in the LLM market, widely used via API, ChatGPT, and various products. As of 2026, the flagship is GPT-5.4 (announced March 5, 2026), a next-generation model that unifies reasoning, coding, and agentic capabilities into a single architecture.
Latest Model: GPT-5.4
OpenAI's flagship announced on March 5, 2026. Its most distinctive feature is the unification of previously separate systems: reasoning models (o3/o4-mini), coding-specialized (Codex), and agent capabilities (Operator) into a single architecture.
5 Variants
| Model | Use Case | API Price (Input / Output per 1M tokens) |
|---|---|---|
| GPT-5.4 Pro | Top-tier performance, complex reasoning/research | $30 / $180 |
| GPT-5.4 Standard | General-purpose flagship | $2.50 / $15 |
| GPT-5.4 Thinking | Extended thinking mode | — |
| GPT-5.4 Mini | Balanced, cost-efficient | — |
| GPT-5.4 Nano | Fast, lightweight, edge-friendly | — |
Benchmarks
- SWE-bench Pro (coding): 57.7% — industry-leading
- OSWorld (autonomous computer use): 75% — powered by Computer Use API
- GDPval (knowledge work): 83%
Key Features
1. 5-Level Reasoning Effort Control
Adjust the model's thinking depth across 5 levels — instant answers for simple questions, deep reasoning for complex ones. Users can balance cost and quality.
2. Native Computer Use API
The autonomous agent capability to recognize screens and perform clicks/inputs is now integrated as an API. Scored 75% on OSWorld, absorbing the former Operator product. Automates browser operations, desktop app control, and form filling.
3. 1M+ Token Context Window
Supports long documents, entire codebases, and multi-file references. Extended to match Claude 4.6's level.
4. Codex Integration
The coding ability of the former GPT-5.3-Codex is now integrated into the mainline, bringing frontier-level code generation to general use cases. SWE-bench Pro 57.7% is industry-leading.
5. Sora (Video Generation)
Sora, which generates high-quality video up to 60 seconds from text, is also available. Supports physics simulation, complex camera work, and character consistency.
ChatGPT Plans
| Plan | Monthly | Highlights |
|---|---|---|
| Free | $0 | Limited access to GPT-5.4 Standard |
| Plus | $20 | GPT-5.4 Thinking, image generation, Advanced Voice |
| Pro | $200 | Unlimited GPT-5.4 Pro, expanded Sora, priority access |
| Business | $25/user | Team features, admin console, data protection |
| Enterprise | Contact sales | SSO, audit logs, dedicated support, SLA |
Model Lineage
- GPT-4o (May 2024) — multimodal, voice/image integration
- GPT-5 (August 2025) — first GPT-5
- GPT-5.1 (November 2025) — 8 customizable personalities → retired March 2026
- GPT-5.2 (early 2026) — refinement
- GPT-5.3 (spring 2026) — Instant / Codex branches
- GPT-5.4 (March 5, 2026 — current) — unified architecture, absorbed Codex/Operator
- GPT-5.5 (planned late 2026)
Typical Use Cases
- Code development: Canvas, code execution, multi-file editing, debugging
- Research: Deep Research, long-document summarization, paper analysis
- Business automation: Autonomous PC operation via Computer Use
- Content generation: Articles, emails, marketing copy
- Data analysis: Advanced Data Analysis, Python execution, chart generation
- Image/video generation: DALL-E 3, GPT-Image, Sora
Strengths
- ✅ Unified architecture — reasoning, coding, agents, and multimodal in one model
- ✅ Computer Use API — native PC automation (75% OSWorld)
- ✅ Largest ecosystem — GPTs marketplace, plugins, extensive SDKs
- ✅ Industry-standard API — REST API, Python/Node/Java SDKs
- ✅ Frontier coding — SWE-bench Pro 57.7% (industry-leading)
- ✅ Multimodal — text, image, audio, video, Computer Use
Weaknesses
- ❌ Pro tier is expensive at $200/mo
- ❌ API pricing higher than Claude Sonnet or Gemini 2.5 Pro
- ❌ Closed source (weights not public)
- ❌ API rate limits (during peak hours)
- ❌ Privacy concerns (enterprise data handling)
Official Resources
- Website: https://openai.com
- API docs: https://platform.openai.com/docs
- ChatGPT: https://chatgpt.com
- Pricing: https://openai.com/api/pricing