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MODELS

GPT-5.6 Sol

by OpenAI

modelgpt-5.6-sol
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Overview

OpenAI’s GPT-5.6 flagship model for advanced reasoning, coding, and complex agentic work.

Details

GPT-5.6 Sol is identified by OpenAI source metadata as the flagship model in the GPT-5.6 family, positioned for advanced reasoning, coding, and complex agentic work. OpenAI metadata says GPT-5.6 is generally available across ChatGPT, Codex, and the OpenAI API, with API access to Sol, Terra, and Luna. The direct OpenAI API model page identifies GPT-5.6 Sol as a frontier model with a 1,050,000-token context window and 128,000 max output tokens. OpenAI also provides GPT-5.6 guidance and a system card covering safety evaluations, preparedness classifications, safeguards, red-teaming, and deployment risk mitigations.

When to Use

Use when you want OpenAI’s flagship GPT-5.6 model for advanced reasoning workloads. Use for coding or complex agentic work where GPT-5.6 Sol’s positioning is relevant. Use when evaluating GPT-5.6-family options since supplied OpenAI metadata distinguishes Sol as the flagship model alongside Terra and Luna.

Getting Started

  1. Read the GPT-5.6 Sol preview page for OpenAI’s product positioning.
  2. Review the GPT-5.6 Sol API model page for model limits
  3. pricing
  4. and availability details.
  5. Use the OpenAI model guidance page to understand GPT-5.6 capabilities and aliases
  6. including that the gpt-5.6 alias routes to gpt-5.6-sol.
  7. Check the OpenAI API pricing page before production use.
  8. Review the GPT-5.6 system card for safety and deployment-risk information.

Key Features

  • •Flagship model in the GPT-5.6 family
  • •according to OpenAI source metadata.
  • •Positioned for advanced reasoning
  • •coding
  • •and complex agentic work.
  • •OpenAI API model page lists a 1
  • •050
  • •000-token context window and 128
  • •000 max output tokens.
  • •OpenAI model guidance references Programmatic Tool Calling
  • •multi-agent beta
  • •explicit prompt caching
  • •persisted reasoning
  • •max reasoning effort
  • •and pro mode for GPT-5.6.
  • •Supported by OpenAI safety documentation in the GPT-5.6 system card.

Capabilities

  • •Advanced reasoning
  • •Coding
  • •Complex agentic work
  • •OpenAI API access
  • •Large-context processing
  • •Programmatic Tool Calling
  • •Multi-agent beta
  • •Explicit prompt caching
  • •Persisted reasoning

Last updated Jul 30, 2026