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fallback-and-lts-models.md

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title Base and long-term support (LTS) models
shortTitle Base and LTS models
intro Learn about base models, long-term support (LTS) models, and how they affect model availability for enterprises using {% data variables.product.prodname_copilot %}.
versions
feature
copilot
allowTitleToDifferFromFilename true
contentType concepts
category
Manage Copilot for a team

About base models

Important

  • On March 18, 2026, {% data variables.product.github %} designated {% data variables.copilot.copilot_gpt_53_codex %} as the base model.
  • Base models apply only to {% data variables.copilot.copilot_business_short %} and {% data variables.copilot.copilot_enterprise_short %}.

A base model is the default AI model that {% data variables.product.prodname_copilot %} uses when no other models are enabled. The base model is automatically enabled for all {% data variables.copilot.copilot_business_short %} or {% data variables.copilot.copilot_enterprise_short %} accounts within 60 days after the model is designated as a base model.

When a new model is designated a base model, the following timeline applies:

Phase Timeline What happens
Announcement Day 0 {% data variables.product.github %} announces the new base model.
Upgrade window Day 0 to Day 60 Customers have 60 days to upgrade their IDE extensions to versions that support the new model.
Enablement Day 60 The new model is automatically enabled on all organizations and enterprises as the base model.

Note

The base model has a 1x premium request multiplier on paid plans. For more information about multipliers, see AUTOTITLE.

About long-term support (LTS) models

Important

  • On March 18, 2026, {% data variables.product.github %} designated {% data variables.copilot.copilot_gpt_53_codex %} as the LTS model.
  • LTS models apply only to {% data variables.copilot.copilot_business_short %} and {% data variables.copilot.copilot_enterprise_short %}.

An LTS model is an AI model that {% data variables.product.github %} commits to supporting for an extended period of one year from its designation date. During that period, the model remains available, which allows users to build around the model without concern that it will be {% data variables.release-phases.closing_down %} unexpectedly.

Continuous access when premium requests are unavailable

{% data variables.copilot.copilot_gpt_53_codex %} is available on paid plans with a 1x premium request multiplier, which means it consumes premium requests. To ensure continuous access to {% data variables.product.prodname_copilot_short %} when premium requests are unavailable:

  • Premium request quota exhausted: If a user has used their monthly premium request allowance, {% data variables.product.prodname_copilot_short %} automatically falls back to {% data variables.copilot.copilot_gpt_41 %} (the former base model) at no additional cost to the user.
  • Overage controls disabled: If an organization or enterprise has disabled premium request overages and a user reaches their limit, {% data variables.product.prodname_copilot_short %} will fall back to {% data variables.copilot.copilot_gpt_41 %}.

Further reading