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OpenAI
GPT-5.3-Codex
GPT-5.3-Codex is OpenAI's most advanced agentic coding model, combining frontier software engineering with long-running autonomous coding workflows.
Quick Stats
Context
400K
Max Output
128K
Provider
OpenAI
Specs
2
Modalities
in textin imagein fileout text
Specs & List Price (per 1M tokens)
Quality
Input $1.75Output $14Cache write $0.175
Value
Input $0.875Output $7Cache write $0.0875
Recommended Plan
GPT-5.3-Codex Starter Plan
Pay-as-you-go after top-up; $1 free credit for new users.
API Endpoint
Model ID
openai/gpt-5.3-codexcURL
curl https://intertoken.ai/v1/chat/completions \
-H "Authorization: Bearer $TOKENPORTAL_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "openai/gpt-5.3-codex",
"messages": [{"role": "user", "content": "Hello!"}]
}'Python (openai SDK)
from openai import OpenAI
client = OpenAI(
base_url="https://intertoken.ai/v1",
api_key="$TOKENPORTAL_API_KEY",
)
resp = client.chat.completions.create(
model="openai/gpt-5.3-codex",
messages=[{"role": "user", "content": "Hello!"}],
)
print(resp.choices[0].message.content)Start using this model
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