According to Amp’s current documented routing, linking a ChatGPT subscription includes these OpenAI models:
GPT-5.6 Terra — used for:
Low mode
Thread reading
Code review
Puck/Search and similar lightweight sub-tasks
GPT-5.6 Sol — used for:
Medium mode
High mode
Librarian/compaction tasks
These routes are billed against your linked ChatGPT subscription rather than Amp credits.
Ultra is not included: it continues to use Claude Fable and consumes Amp credits. Other non-OpenAI models, such as GLM or Haiku, are likewise not covered by the ChatGPT subscription.
Some descriptions of Amp’s routing mention GPT-6 Astra for High-mode or Oracle roles; that appears to reflect a different routing configuration or timeframe. Amp’s current “A Dial for You” mapping identifies the included models as GPT-5.6 Terra and GPT-5.6 Sol.
How strongly the models agree, per check. Filled points mark checks that changed the answer.
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.
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.
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.
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.