Models

GPT-5.6 Sol

OpenAI · July 2026

Handles hard problems, long documents, and work that runs over many steps. GPT-6 Astra is newer.

Best for
Coding, deep reasoning, and agent workflows

  • Context window

    1,050,000 tokens

    ≈ 788,000 words · about 3,150 pages

  • Max output

    128,000 tokens

    ≈ 96,000 words in a single answer

  • Knowledge cutoff

    February 2026

    its training cutoff

Modalities

  • TextInput and output
  • ImageInput only
  • AudioNot supported
  • VideoNot supported

Reasoning effort

Default: Medium.

  • None

  • Low

  • Medium

  • High

  • X-High

  • Max

Features

  • StreamingSupported
  • Function callingSupported
  • Structured outputsSupported
  • Fine-tuningNot supported

Tools

  • Web searchSupported
  • File searchSupported
  • Image generationSupported
  • Code interpreterSupported
  • Hosted shellSupported
  • Apply patchSupported
  • SkillsSupported
  • Computer useSupported
  • MCPSupported
  • Tool searchSupported

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