Fix a typo in README.md

README.md

@@ -87,7 +87,7 @@ openai_kwargs = {
 # For a good practice, choose a cheaper/faster model for `conv_simulator_lm` which is used to split queries, synthesize answers in the conversation.
 # Choose a more powerful model for `article_gen_lm` to generate verifiable text with citations.
 gpt_35 = OpenAIModel(model='gpt-3.5-turbo', max_tokens=500, **openai_kwargs)
-gpt_4 = OpenAIModel(model='gpt-4-o', max_tokens=3000, **openai_kwargs)
+gpt_4 = OpenAIModel(model='gpt-4o', max_tokens=3000, **openai_kwargs)
 lm_configs.set_conv_simulator_lm(gpt_35)
 lm_configs.set_question_asker_lm(gpt_35)
 lm_configs.set_outline_gen_lm(gpt_4)