Support Gpt-5.2 in Tokenizer library - #7571
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Pull request overview
This PR adds support for the GPT-5.2 model to the Tokenizer library, following the same pattern as GPT-5 and GPT-5.1 models which use the O200kBase encoding.
Changes:
- Added GPT-5.2 model support with O200kBase encoding
- Updated test cases to include GPT-5.2 and GPT-5.2-mini variants
- Added model mappings for both exact match and prefix matching
Reviewed changes
Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.
| File | Description |
|---|---|
| src/Microsoft.ML.Tokenizers/Model/TiktokenTokenizer.cs | Added "gpt-5.2" and "gpt-5.2-" mappings to O200kBase encoding in both exact match dictionary and prefix array |
| test/Microsoft.ML.Tokenizers.Tests/TiktokenTests.cs | Added GPT5_2 tokenizer property, included it in O200kBase encoding test, and added test cases for "gpt-5.2" and "gpt-5.2-mini" model names |
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stephentoub
approved these changes
Jan 22, 2026
Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## main #7571 +/- ##
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Coverage 69.02% 69.02%
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Files 1482 1482
Lines 274096 274099 +3
Branches 28266 28266
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+ Hits 189191 189199 +8
Misses 77518 77518
+ Partials 7387 7382 -5
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