GPT-5.5 vs GPT-5.3 Codex
GPT-5.5 vs GPT-5.3 Codex: Side-by-side API pricing and specs — call both with one OpenAI-compatible key on GetModel.
GPT-5.5
OpenAI · Text
OpenAI GPT-5.5 flagship model with strong all-round reasoning, writing and coding. Served through getmodel's stable Codex Pro pool over an OpenAI-compatible endpoint.
View details → GPT-5.3 Codex
OpenAI · Text
OpenAI GPT-5.3 Codex, specialised for programming and agentic coding. Served through getmodel's stable Codex Pro pool over an OpenAI-compatible endpoint.
View details →Pricing comparison
| GPT-5.5 | GPT-5.3 Codex | |
|---|---|---|
| Input / 1M tokens | $0.309 | $0.108 Cheaper |
| Output / 1M tokens | $1.86 | $0.866 Cheaper |
Specifications
| Provider | OpenAI | OpenAI |
| Type | Text | Text |
| Endpoints | openai | openai |
How to call
One API key calls both models — just change the "model" field.
from openai import OpenAI
client = OpenAI(base_url="https://getmodel.ai/v1", api_key="$GETMODEL_API_KEY")
# GPT-5.5
client.chat.completions.create(model="gpt-5.5", messages=[{"role":"user","content":"Hi"}])
# GPT-5.3 Codex (same key, just change "model")
client.chat.completions.create(model="gpt-5.3-codex", messages=[{"role":"user","content":"Hi"}])