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Copilot’s Model Upgrades: Why Your "Autocomplete Feel" Suddenly Changed

Copilot completions now ride GPT-4.1 Copilot. Defaults moved—so your IDE feel changed without you noticing.

5 min read Updated 2025

Model swaps (GPT-4o to GPT-4.1 Copilot for completions, updated chat/agent defaults) change latency and suggestion quality.

Copilot model transitions
  • Mar 2025: GPT-4o Copilot GA.
  • Aug 2025: GPT-4.1 Copilot for completions.
  • Fall 2025: Default model refresh for chat/agent.

Tip: Re-evaluate after model changes; adjust quotas and policies accordingly.

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