ChatGPT GPT-5.6 access by plan: Free, Go, Plus, Pro, Business, and Enterprise
Updated: Sep 16
GPT-5.6 access in ChatGPT is plan-specific. Free and Go center on GPT-5.6 Luna, Plus adds GPT-5.6 Sol through Medium and High reasoning, and Pro, Business, and Enterprise add deeper reasoning levels and Pro-model access.
The same subscription can expose different models in standard Chat, ChatGPT Work, and Codex, so plan access should be read together with product surface.
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Plan | Standard Chat core | Sol Medium / High | Extra High | Pro option |
|---|---|---|---|---|
Free | GPT-5.6 Luna | No | No | No |
Go | GPT-5.6 Luna | No | No | No |
Plus | GPT-5.6 Sol available | Yes | No | No |
Pro | GPT-5.6 Sol | Yes | Yes | Yes |
Business | GPT-5.6 Sol | Yes | Yes | Yes |
Enterprise | GPT-5.6 Sol subject to workspace controls | Yes | Yes | Yes |
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CURRENT GPT-5.6 PLAN MATRIX
GPT-5.6 is a family rather than one identical ChatGPT experience. Luna is the fast everyday tier, Sol is the flagship reasoning tier, and the Pro option on eligible plans uses the highest-capability path for difficult work.
Two users can therefore both say they have GPT-5.6 while receiving different reasoning controls and model behavior.
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FREE — LUNA AND THINK
Free uses GPT-5.6 Luna for the default experience and for Think. It does not include GPT-5.6 Sol in standard ChatGPT conversations.
Free still includes a broad tool set, but allowances around uploads, images, analysis, research, memory, and other features are lower than on paid plans.
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GO — MORE CAPACITY, SAME LUNA MODEL FAMILY
Go increases capacity around several tools and extends memory while remaining centered on GPT-5.6 Luna. Think on Go also uses Luna rather than Sol.
Go is therefore a quota and convenience upgrade over Free before it is a reasoning-model upgrade.
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PLUS — SOL WITH MEDIUM AND HIGH REASONING
Plus is the first mainstream personal tier in the current ladder that gives access to GPT-5.6 Sol reasoning through Medium and High. It does not include Extra High or the Pro option.
For users moving from Go to Plus, the central qualitative change is the move from Luna-centered access to the Sol reasoning family.
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PRO — EXTRA HIGH AND PRO MODELS
Pro adds Extra High reasoning and the Pro option on top of Sol Medium and High. The subscription currently exists in $100 and $200 usage levels, although new enrollment in the $200 level is temporarily paused.
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BUSINESS AND ENTERPRISE — MODEL ACCESS PLUS WORKSPACE CONTROLS
Business provides the same higher GPT-5.6 reasoning stack, while Enterprise exposes it subject to workspace and administrator permissions. Organizational users therefore need to check both the commercial plan and the workspace's enabled-model policy.
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WORK, CODEX, AND API — DIFFERENT ACCESS SURFACES
ChatGPT Work and Codex have their own model-access matrices. In Work, Plus, Pro, Business, and Enterprise can use Sol, Terra, and Luna. In Codex, Free and Go receive GPT-5.6 Terra, while higher plans can use Sol, Terra, and Luna.
API availability and pricing are separate again. A model exposed through the API does not imply identical access in standard ChatGPT, and a ChatGPT subscription does not include general API usage.
DS access map: plan → product surface → model family → reasoning effort is the useful order for determining what a user can actually run.
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