Watch · checked weekly
Answer from Aug 18
An earlier version of this page. The current answer may differ.
See the current answer →Checked 10 times since Jul 28 · paused
Amp’s ChatGPT-linked subscription does not mean you get the full set of ChatGPT/OpenAI models inside Amp. It mainly lets Amp route certain modes to the GPT-5.6 family using your linked ChatGPT entitlement, while Amp’s own plan still handles the app features and usage limits.[1][2]
In practical terms, the linked subscription is used for these Amp routes:
So the short answer is: the ChatGPT-linked subscription mainly covers GPT-5.6 Sol/Terra routes inside Amp, not every model Amp can use. In particular, it does not automatically include models like Claude Fable 5 or other non-OpenAI providers used by some Amp modes.[1][2]
One important caveat: Amp’s routing appears to evolve over time, so exact model assignment can vary by mode and update.
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.
Read this versionThe 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.
Read this versionThe 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.
Read this versionThe 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.
Shown aboveWatch started
The first answer. Every later check is compared with it.
Read this versionOpenAI GPT-5.6 Luna · Google Gemini Gemini 3.7 Flash · Grok Grok 4.3
Low mode agent switches from GLM-5.2 to GPT-5.6 Terra with a linked ChatGPT sub.
Gemini, Grok
“(serving as the main fast agent, replacing the default GLM-5.2).”
Low mode main agent remains GLM-5.2 with GPT-5.6 Sol as oracle.
OpenAI
How to verify: Check Amp's latest modes documentation regarding model routing for Low mode with a linked ChatGPT account.
High mode uses GPT-5.6 Sol for both main agent and oracle when ChatGPT is linked.
Gemini, Grok
“the main agent (with extra-high reasoning) and the auxiliary Oracle”
High mode oracle continues to use Claude Fable 5.
OpenAI
How to verify: Check Amp's routing settings for High mode oracle under a linked ChatGPT plan.