GPT-5 is OpenAI's latest-generation large language model, officially released on August 7, 2025. It comes with advanced reasoning capabilities, multimodal input handling (text and images), and a unified model architecture that dynamically selects the best sub-model for a task.

GPT-5 can perform multi-step logical reasoning, revise its conclusions, and justify outputs, making it better suited for complex workflows beyond simple conversations.

Variants of GPT-5

The main variants of GPT-5 released by OpenAI include:

• GPT-5 (regular/main): Designed for logic, multi-step reasoning, and complex tasks. It offers the full capabilities of GPT-5 with strong reasoning and agentic functions.
• GPT-5 mini: A lightweight version optimized for cost-sensitive applications and users with lower usage needs. It provides good performance at a reduced cost and latency.
• GPT-5 nano: An even faster, cheaper, and more compact model optimized for low-latency and very cost-efficient use. Ideal for applications that require quick responses with minimal computing resources.

Additionally, there is a GPT-5 pro variant, providing higher reasoning depth and peak performance, accessible via paid subscriptions like ChatGPT Pro with enhanced compute but higher cost and latency.

Key Improvements in GPT-5

The major features and improvements of GPT-5 include:

Reduced Hallucinations

GPT-5 is significantly less prone to fabricating information, with up to 45% fewer factual errors compared to GPT-4o in some tests, and it is trained to signal when it cannot complete a task without speculation.

Unified Advanced Reasoning and Multimodal Capabilities

GPT-5 integrates advanced reasoning models with multimodal input (text, images, and voice), allowing seamless handling of complex, multi-step workflows without switching between specialized models.

Structured, Chain-of-Thought Reasoning

GPT-5 incorporates structured logic from previous iterations like the o3 model, enabling multi-step thinking, revising conclusions, and justifying outputs for higher accuracy, especially in factual and analytical tasks. This reduces hallucinations substantially compared to earlier versions (45-80% fewer factual errors in some tests).

Expanded Context Windows

GPT-5 supports large input sizes, with an input limit of around 272,000 tokens and an output limit of approximately 128,000 tokens, allowing it to maintain coherence over extended conversations and process large documents.

GPT-5 vs GPT-4o

GPT-5 significantly outperforms GPT-4o across most key dimensions such as reasoning, coding, reliability, and multimodal capabilities.

Here is a detailed comparison:

Feature	GPT-5	GPT-4o
Reasoning Performance	Much stronger multi-step reasoning; scores around 85.7%-89.4% on scientific benchmarks (GPQA Diamond) with extended "thinking" enabled	Weaker with around 70.1% on the same benchmarks; struggles with complex scientific reasoning
Coding Capabilities	Leads benchmarks such as SWE-bench Verified (74.9%) and Aider Polyglot (88%) with chain-of-thought enabled; best coding model to date	Performs weakest in these academic coding and code-editing benchmarks
Error Rates & Reliability	Has lowest hallucination and error rates (under 1% in open source and 1.6% on hard medical tasks); reasoning mode reduces errors by over half	High hallucination and error rates (up to 15.8% on HealthBench and 22% on traffic prompts)
Model Architecture	Unified architecture with dynamic sub-model switching, multimodal input (text and images), agentic capabilities, and tool integration	Separate legacy model, less multimodal
Usage & Availability	Available in standard, mini, and Pro versions with different reasoning depths and API access; integrated by Microsoft	Legacy, deprecated in ChatGPT as of April 2025, still accessible via API
Multimodal & Tool Integration	Strong real-time handling of text and images, planned video support, and integrations with productivity tools and coding environments	Limited multimodal capability, no planned video understanding

How to Access GPT-5

There are a few places where you can access GPT-5.

1. HIX AI (Recommended): This can be the easiest and smoothest way to try GPT-5. It's free to try on HIX AI without login required. And we offer unrestricted access to this model for users from all over the world.
2. ChatGPT web interface: GPT-5 is available to all ChatGPT users, including Free, Plus, Pro, and Team subscribers. Free users get limited usage with fallback to GPT-5-mini after their usage cap, Plus users enjoy higher usage limits, and Pro users have access to GPT-5 Pro with the highest capabilities and unlimited usage.
3. API access: GPT-5 is available through OpenAI's API platform for developers, offering different model variants like GPT-5, GPT-5-mini, and GPT-5-nano to suit cost and latency needs.