What models does Amp’s new ChatGPT-linked subscription actually includ

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Answer from Sep 8

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The answer then

Amp’s ChatGPT-linked subscription is primarily a routing and billing integration, not access to a catalog of every model Amp supports.

With a linked ChatGPT subscription, Amp’s built-in modes are routed approximately as follows:

Amp function	Model used with ChatGPT linked
Low	GPT-5.6 Terra
Medium	GPT-5.6 Sol
High agent	GPT-5.6 Sol
High oracle/reviewer	GPT-5.6 Sol
Thread reader	GPT-5.6 Terra
Code review	GPT-5.6 Terra

These OpenAI-backed calls are charged against the linked ChatGPT subscription rather than Amp credits, subject to the usage limits of the ChatGPT plan. [1][3][S4]

What is not included:

Ultra mode remains on Claude Fable and uses Amp credits.
Non-OpenAI models, such as Claude or GLM models used through other routes, are not automatically covered.
Plugin or custom modes continue to use whatever model they specify.
Linking ChatGPT does not provide unrestricted access to every OpenAI model or make the routed models independently selectable in a model playground.

The exact assignments may change as Amp updates its routing; some Amp pages or older descriptions may show different model names. The important practical distinction is that linking ChatGPT covers Amp’s built-in Low, Medium, and High OpenAI routes, while Ultra and other non-covered routes remain Amp-credit usage. [1][2]

Sources

History

How strongly the models agree, per check. Filled points mark checks that changed the answer.

Sep 29
The answer changed

The old consensus stated that High dial and Oracle use GPT-6 Astra. The new consensus reverses this, stating that Low uses GPT-5.6 Terra, Medium uses GPT-5.6 Sol, and High uses GPT-5.6 Sol, while acknowledging GPT-6 Astra as a future or changing documentation name. This is a material shift in specific model assignments.
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Sep 22
The answer changed

The routing models have fundamentally shifted. The old consensus stated that ChatGPT linking covers GPT-5.6 Terra and GPT-5.6 Sol, while Ultra and others are excluded. The new consensus updates this to include GPT-6 Astra for High-mode and Oracle roles (depending on the ChatGPT tier), replacing the older GPT-5.6 assignments for those tiers.
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Sep 1 – Sep 15 3 checks, no change
- Sep 15 Read this version
- Sep 8 Shown above
- Sep 1 Read this version
Aug 25
The answer changed

The exact model routing breakdown substantially changed: Low main agent shifted from GLM-5.2 to GPT-5.6 Terra, High oracle shifted from Claude Fable 5 to GPT-5.6 Sol, and Code review shifted from GPT-5.5 to GPT-5.6 Terra. Additionally, the new answer specifies that Low/Med/High workflows are covered, while Ultra mode uses Claude Fable and Amp credits.
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Aug 18
The answer changed

The breakdown of model assignments per routing mode changed significantly. Low mode changed from GPT-5.6 Terra to GLM-5.2 + GPT-5.6 Sol; High mode oracle changed from GPT-5.6 Sol to Claude Fable 5; Review changed from GPT-5.6 Terra to GPT-5.5; and specific routes for Puck/Search and Librarian were added while general routing details were updated.
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Aug 4 – Aug 11 2 checks, no change
- Aug 11same answer, new wording Read this version
- Aug 4 Read this version
Jul 28, 2026
Watch started

The first answer. Every later check is compared with it.
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How the 3 models compared · 1 contradiction

OpenAI GPT-5.6 Luna · Google Gemini Gemini 3.7 Flash · DeepSeek DeepSeek V4.1 Flash

contradiction · critical

Specific model routing assignments for Low, High, and Ultra modes under the linked ChatGPT subscription.

Low uses GPT-5.6 Terra, High uses GPT-5.6 Sol, and Ultra remains Claude Fable.

Gemini, DeepSeek

Low uses GPT-6 Astra, High uses Fable 5.1, and Ultra uses GPT-6 Astra under ChatGPT link.

OpenAI

How to verify: Check Amp's official routing documentation for the exact model assignments per mode when a ChatGPT subscription is linked.