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Swap two environment variables and change the model name. That’s it. 
export OPENAI_BASE_URL='https://api.telnyx.com/v2/ai/openai'
export OPENAI_API_KEY='KEY***'

from openai import OpenAI

client = OpenAI()  # picks up env vars
chat_completion = client.chat.completions.create(
    model="moonshotai/Kimi-K2.5",
    messages=[{"role": "user", "content": "Tell me about Telnyx"}],
    temperature=0.0,
    stream=True,
)
Or pass explicitly: 
import os
from openai import OpenAI

client = OpenAI(
    api_key=os.getenv("TELNYX_API_KEY"),
    base_url="https://api.telnyx.com/v2/ai/openai",
)
chat_completion = client.chat.completions.create(
    model="moonshotai/Kimi-K2.5",
    messages=[{"role": "user", "content": "Tell me about Telnyx"}],
    temperature=0.0,
    stream=True,
)

​
Chat Completions Compatibility

ParameterTelnyxOpenAI
messages✅✅
model✅✅
stream✅✅
max_tokens✅✅
temperature✅✅
top_p✅✅
frequency_penalty✅✅
presence_penalty✅✅
n✅✅
stop✅✅
logit_bias✅✅
logprobs✅✅
top_logprobs✅✅
seed✅✅
response_format✅✅
tool_choice✅✅
tools✅✅
function✅✅
retrieval✅❌
guided_json✅❌
guided_regex✅❌
guided_choice✅❌
min_p✅❌
use_beam_search✅❌
best_of✅❌
length_penalty✅❌
early_stopping✅❌
user❌✅

​
Transcriptions Compatibility

ParameterTelnyxOpenAI
file✅✅
model✅✅
response_format✅✅
timestamp_granularities[] → segment✅✅
timestamp_granularities[] → word❌✅
language❌✅
prompt❌✅
temperature❌✅