gpt-5.5 vs gpt-6-astra
| gpt-5.5 | gpt-6-astra | |
|---|---|---|
| Providers | OpenAI | OpenAI |
| Input $/M | $5.00 | $10.00 |
| Output $/M | $30.00 | $50.00 |
| Output multiplier | ×6.00 | ×5.00 |
| Context window | 1.05M tokens | 1.05M tokens |
| Intelligence index | 38.4 | 52.7 |
| Coding index | 74.9 | 76.9 |
What the numbers mean
gpt-5.5 is roughly 2.0× cheaper on input than gpt-6-astra. If your workload passes the quality bar on the cheaper model, that gap compounds across every request; route to gpt-6-astra deliberately rather than by default.
On measured intelligence index the gap is 14.3 points, with gpt-6-astra ahead. That is a large enough spread to be visible on multi-step tasks.
Tags: gpt-5.5 — Chat, Reasoning, Coding, Vision · gpt-6-astra — Chat, Reasoning, Coding, Vision
Code
from openai import OpenAI
client = OpenAI(base_url="https://starseaapi.com/v1", api_key="sk-...")
# gpt-5.5
client.chat.completions.create(model="gpt-5.5", messages=[{"role":"user","content":"Hi"}])
# gpt-6-astra
client.chat.completions.create(model="gpt-6-astra", messages=[{"role": "user", "content": "Hi"}])