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GPT-5.6 Review

OpenAI's GPT-5.6 is a frontier AI model family designed for complex reasoning, coding, and autonomous agentic tasks, capable of building entire interactive systems.

shipped Jul 9, 2026aifreemium
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GPT-5.6 — product screenshot

Why it matters

1GPT-5.6 was publicly launched on July 9, 2026, following a limited preview that began on June 26, 2026.
2The model family introduces three distinct tiers: Sol, Terra, and Luna, each optimized for different levels of intelligence, speed, and cost.
3GPT-5.6 Sol achieved 88.8% on Terminal-Bench 2.1, a benchmark for command-line workflows, with Sol Ultra reaching 91.9%.
4For app-building conversations, GPT-5.6 utilized 22% fewer input tokens and 23% fewer output tokens compared to GPT-5.5.

About GPT-5.6

Pricing Plans

ChatGPT
ChatGPT Business
ChatGPT Enterprise
ChatGPT for Education
Codex

Leadership

Elon Musk
Sam Altman
API DocsGitHub

Specs

API Docs

View Documentation →

API Available

Yes, public API

overview

What is GPT-5.6?

GPT-5.6 is a large language model (LLM) tool developed by OpenAI that enables customers, developers, and individuals with ambitious work to perform complex reasoning, coding, and autonomous agentic tasks. It is capable of building entire interactive systems and offers frontier intelligence across its Sol, Terra, and Luna tiers. This suite of advanced AI models, publicly available since July 9, 2026, is designed to handle a wide range of complex tasks. GPT-5.6 Sol is the flagship model, optimized for demanding tasks such as complex coding, in-depth research synthesis, advanced mathematical problems, cybersecurity analysis (vulnerability research and exploitation), and scientific research in areas like biology and genomics. GPT-5.6 Terra serves as a balanced model for general-purpose text generation, summarization, customer support automation, and moderate-complexity reasoning. GPT-5.6 Luna is the fastest and most cost-efficient tier, suitable for high-volume, lower-stakes applications like quick conversations and routine tasks. The models are accessible via ChatGPT, Codex, and the OpenAI API.

features

Key Features of GPT-5.6

GPT-5.6 incorporates a range of advanced capabilities designed to support complex AI applications and workflows across various domains.

  • Complex reasoning capabilities for multi-step problem-solving and nuanced generation.
  • Advanced coding and code generation, including performance on Terminal-Bench 2.1.
  • Autonomous agentic task execution, enabling planning and execution of multi-step actions.
  • Ability to build entire interactive systems.
  • API availability for programmatic integration into diverse applications.
  • Improved agentic capabilities for enhanced workflow automation.
  • Specialized vulnerability research and exploitation in cybersecurity.
  • HIPAA alignment available with a Business Associate Agreement (BAA).
  • ISO/IEC 27001:2022, ISO/IEC 27017:2015, ISO/IEC 27018:2019, and ISO/IEC 27701:2019 certifications.
  • SOC 2 Type 2 compliance for security and operational integrity.

use cases

Who Should Use GPT-5.6?

GPT-5.6 is engineered for a diverse set of users requiring advanced AI capabilities for demanding tasks.

  • Cybersecurity Professionals: For advanced vulnerability research, exploitation, and in-depth security analysis.
  • Developers: For complex coding tasks, building interactive systems, and integrating AI into applications via the OpenAI API.
  • Researchers (especially in Biology): For in-depth research synthesis, advanced mathematical problems, and scientific discovery.
  • Enterprise Customers: For demanding tasks requiring deep reasoning, nuanced generation, and multi-step problem-solving across various business functions.
  • Individuals with Ambitious Work: For general-purpose text generation, summarization, content creation, and moderate-complexity reasoning tasks.

how to use

How to Use GPT-5.6

GPT-5.6 models are accessible through the ChatGPT platform, the Codex environment, and the OpenAI API, allowing for direct interaction or programmatic integration into applications.

  • 1Access ChatGPT: Utilize the web interface or the upgraded ChatGPT desktop app for direct interaction with GPT-5.6 models (Sol, Terra, Luna).
  • 2Integrate via OpenAI API: Developers can access GPT-5.6 models programmatically using the OpenAI API, with documentation available at https://platform.openai.com/docs/api-reference.
  • 3Utilize Codex: Engage with GPT-5.6 within the Codex environment for specialized coding and development tasks.
  • 4Select Model Tier: Choose between GPT-5.6 Sol for complex reasoning, Terra for balanced performance, or Luna for speed and cost efficiency based on specific task requirements.
  • 5Monitor API Usage: Track requests per minute (RPM) and tokens per minute (TPM) in the developer console, adjusting usage according to account-specific rate limits.

pricing

GPT-5.6 Pricing & Plans

GPT-5.6 operates on a freemium model, with specific pricing for its various models and tiers. While detailed per-token pricing for the newly released GPT-5.6 Sol, Terra, and Luna models is not explicitly provided, previous GPT-5.x models offer a reference for API usage costs. Enterprise and specialized access tiers, such as ChatGPT Business, ChatGPT Enterprise, ChatGPT for Education, and Codex, require direct consultation with OpenAI sales for pricing. API rate limits are based on requests per minute (RPM) and tokens per minute (TPM), varying by model, account type, and usage history, and can be viewed in the developer console.

  • GPT-5.5 (Input): $5.00 per 1M tokens
  • GPT-5.5 (Output): $30.00 per 1M tokens
  • GPT-5.4 (Input): $2.50 per 1M tokens
  • GPT-5.4 (Output): $15.00 per 1M tokens
  • GPT-5.4 Mini (Input): $0.75 per 1M tokens
  • GPT-5.4 Mini (Output): $4.50 per 1M tokens
  • GPT-5.4 Nano (Input): $0.20 per 1M tokens
  • GPT-5.4 Nano (Output): $1.25 per 1M tokens
  • GPT-5.5 Pro (Input): $30.00 per 1M tokens
  • GPT-5.5 Pro (Output): $180.00 per 1M tokens
  • GPT-5.4 Pro (Input): $30.00 per 1M tokens
  • GPT-5.4 Pro (Output): $180.00 per 1M tokens
  • GPT-5 (Input): $1.25 per 1M tokens
  • GPT-5 (Output): $10.00 per 1M tokens
  • ChatGPT: Contact sales
  • ChatGPT Business: Contact sales
  • ChatGPT Enterprise: Contact sales
  • ChatGPT for Education: Contact sales
  • Codex: Contact sales

Pros

  • +Tiered model system (Sol, Terra, Luna) optimized for diverse intelligence, speed, and cost requirements.
  • +Achieves state-of-the-art performance in complex reasoning, coding, and cybersecurity, with Sol Ultra scoring 91.9% on Terminal-Bench 2.1.
  • +Demonstrates improved token efficiency, using 22% fewer input and 23% fewer output tokens than GPT-5.5 for app-building conversations.
  • +Enhanced agentic capabilities, enabling multi-step planning and execution for complex tasks.
  • +Adheres to stringent compliance standards including ISO/IEC 27001:2022, SOC 2 Type 2, and HIPAA alignment (with BAA).

Cons

  • −Specific per-token pricing for GPT-5.6 Sol, Terra, and Luna models is not publicly detailed, requiring reliance on previous GPT-5.x model rates.
  • −Advanced cybersecurity capabilities led to U.S. government review, indicating potential regulatory scrutiny.
  • −API rate limits are variable, based on model, account type, and usage history, requiring active management by developers.
  • −Enterprise-level pricing for ChatGPT and Codex requires direct contact with sales, lacking transparent public figures.
  • −While training on user data is default_off, the option to enable it may raise privacy concerns for some organizations.

Similar Tools

GPT-5.6 vs Competitors

GPT-5.6 is positioned as a frontier intelligence model, competing with other leading AI models by offering distinct capabilities and pricing structures.

1
Anthropic Claude 3 OpusOn StorkCompare

Claude 3 Opus is Anthropic's most intelligent model, excelling in complex reasoning, nuanced content creation, and sophisticated code generation, with strong multimodal (text and image) capabilities and tool use for autonomous agents.

Compared to GPT-5.6's freemium model, Claude 3 Opus is generally more expensive, with API pricing at $15.00 per million input tokens and $75.00 per million output tokens. It targets enterprise workloads requiring high levels of intelligence and complex task automation.

2
Google Gemini 1.5 Pro↗

Gemini 1.5 Pro is a multimodal AI model featuring an extensive 1-million-token context window, enabling it to process and reason over vast amounts of text, images, audio, and video for deep analysis and code-related tasks.

Gemini 1.5 Pro offers a freemium model similar to GPT-5.6, with a free plan for basic use and a paid 'Gemini Advanced' tier for access to 1.5 Pro. Its API pricing is competitive, with significant reductions as of October 2024, making it a cost-effective option for developers and large organizations.

3
Mistral Large 3On StorkCompare

Mistral Large 3 is a flagship multimodal model known for its top-tier reasoning, native multilingual fluency across several European languages, and strong performance in coding and mathematical benchmarks, supporting a 256,000-token context window.

Mistral Large 3 offers highly competitive pricing at $0.50 per million input tokens and $1.50 per million output tokens, often undercutting major providers. It provides a freemium model through its 'Le Chat' consumer plans, appealing to both individual users and enterprises for complex agentic tasks.

4
Meta Llama 3.1 405B↗

Llama 3.1 405B is Meta's most capable openly available foundation model, designed with advanced coding skills, improved reasoning, and strong tool-use capabilities, rivaling top AI models in general knowledge and multilingual translation.

Unlike GPT-5.6's direct offering, Llama 3.1 405B is an open-weight model, meaning its pricing varies significantly based on third-party hosting providers, which can range from very affordable to more premium tiers. It targets developers and researchers who prioritize flexibility and control over the model's deployment and fine-tuning.

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