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Add GPT-5 model support with o200k_base encoding #440

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Add GPT-5 model support with o200k_base encoding #440

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6 changes: 6 additions & 0 deletions tests/test_model.py
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Original file line number Diff line number Diff line change
@@ -0,0 +1,6 @@
import tiktoken
def test_gpt5_encoding():
encoding = tiktoken.encoding_for_model("gpt-5")
assert encoding.name == "o200k_base"
tokens = encoding.encode("hello world")
assert tokens == [24912, 2375] # Verify o200k_base behavior
1 change: 1 addition & 0 deletions tiktoken/model.py
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Expand Up @@ -32,6 +32,7 @@
"o3": "o200k_base",
"o4-mini": "o200k_base",
# chat
"gpt-5": "o200k_base",
"gpt-4.1": "o200k_base",
"gpt-4o": "o200k_base",
"gpt-4": "cl100k_base",
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