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microsoft--semantic-kernel/docs/decisions/0038-completion-service-selection.md
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---
# These are optional elements. Feel free to remove any of them.
status: accepted
contact: markwallace-microsoft
date: 2024-03-14
deciders: sergeymenshykh, markwallace, rbarreto, dmytrostruk
consulted:
informed:
---
# Completion Service Selection Strategy
## Context and Problem Statement
Today, SK uses the current `IAIServiceSelector` implementation to determine which type of service is used when running a text prompt.
The `IAIServiceSelector` implementation will return either a chat completion service, text generation service or it could return a service that implements both.
The prompt will be run using chat completion by default and falls back to text generation as the alternate option.
The behavior supersedes that description in [ADR-0015](0015-completion-service-selection.md)
## Decision Drivers
- Chat completion services are becoming dominant in the industry e.g. OpenAI has deprecated most of it's text generation services.
- Chat completion generally provides better responses and the ability to use advanced features e.g. tool calling.
## Decision Outcome
Chosen option: Keep the current behavior as described above.