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Add gpt-5.3 model support to TiktokenTokenizer #7579

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Merged
tarekgh merged 2 commits into from
Feb 13, 2026
+6 −0
Merged

Add gpt-5.3 model support to TiktokenTokenizer #7579

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Initial plan
Copilot Feb 12, 2026
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Add gpt-5.3 support in TiktokenTokenizer
Copilot Feb 12, 2026
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2 changes: 2 additions & 0 deletions src/Microsoft.ML.Tokenizers/Model/TiktokenTokenizer.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -1044,6 +1044,7 @@ private static readonly (string Prefix, ModelEncoding Encoding)[] _modelPrefixTo
( "o4-mini-", ModelEncoding.O200kBase ), // e.g. o4-mini

// chat
( "gpt-5.3-", ModelEncoding.O200kBase ),
( "gpt-5.2-", ModelEncoding.O200kBase ),
( "gpt-5.1-", ModelEncoding.O200kBase ),
( "gpt-5-", ModelEncoding.O200kBase ),
Expand Down Expand Up @@ -1073,6 +1074,7 @@ private static readonly (string Prefix, ModelEncoding Encoding)[] _modelPrefixTo
{ "o4-mini", ModelEncoding.O200kBase },

// chat
{ "gpt-5.3", ModelEncoding.O200kBase },
{ "gpt-5.2", ModelEncoding.O200kBase },
{ "gpt-5.1", ModelEncoding.O200kBase },
{ "gpt-5", ModelEncoding.O200kBase },
Expand Down
4 changes: 4 additions & 0 deletions test/Microsoft.ML.Tokenizers.Tests/TiktokenTests.cs
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Expand Up @@ -38,6 +38,7 @@ public class TiktokenTests
public static Tokenizer GPT5 { get; } = TiktokenTokenizer.CreateForModel("gpt-5");
public static Tokenizer GPT5_1 { get; } = TiktokenTokenizer.CreateForModel("gpt-5.1");
public static Tokenizer GPT5_2 { get; } = TiktokenTokenizer.CreateForModel("gpt-5.2");
public static Tokenizer GPT5_3 { get; } = TiktokenTokenizer.CreateForModel("gpt-5.3");
public static Tokenizer Phi4 { get; } = TiktokenTokenizer.CreateForModel("phi-4");
public static TiktokenTokenizer GptOss { get; } = TiktokenTokenizer.CreateForModel("gpt-oss-20b");

Expand Down Expand Up @@ -421,6 +422,8 @@ public void TestEncodeR50kBase()
[InlineData("gpt-5.1-mini")]
[InlineData("gpt-5.2")]
[InlineData("gpt-5.2-mini")]
[InlineData("gpt-5.3")]
[InlineData("gpt-5.3-mini")]
[InlineData("chatgpt-4o-")]
[InlineData("gpt-4")]
[InlineData("gpt-4-")]
Expand Down Expand Up @@ -541,6 +544,7 @@ public void TestEncodingNamesNegativeCases()
[InlineData("gpt-5")]
[InlineData("gpt-5.1")]
[InlineData("gpt-5.2")]
[InlineData("gpt-5.3")]
[InlineData("o1")]
[InlineData("o3")]
[InlineData("o4-mini")]
Expand Down
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