chatgpt-4o-latest to gpt-5.1-chat-latest
All values from official sources Checked 2026-10-17.
Price per 1M tokens
| Field | Old | New | Change |
|---|---|---|---|
| Input | $5 | $1.25 | -75% (lower) |
| Output | $15 | $10 | -33.3% (lower) |
| Cached input | Not published | $0.125 | Not published |
| Example monthly cost | $80 | $32.5 | Example only |
Context and max output
| Limit | Old | New | Change |
|---|---|---|---|
| Context window | 128,000 | 128,000 | 0% (same) |
| Max output | 16,384 | 16,384 | 0% (same) |
Capabilities that differ
No differing capability values are published for both models.
API changes
No parameter change is listed on the official pages we checked. The sample below only swaps the model id.
Code
python before
from openai import OpenAI
client = OpenAI()
response = client.chat.completions.create(
model="chatgpt-4o-latest",
messages=[{"role": "user", "content": "Hello"}],
)
python after
from openai import OpenAI
client = OpenAI()
response = client.chat.completions.create(
model="gpt-5.1-chat-latest",
messages=[{"role": "user", "content": "Hello"}],
)
typescript before
import OpenAI from "openai";
const client = new OpenAI();
const response = await client.chat.completions.create({
model: "chatgpt-4o-latest",
messages: [{ role: "user", content: "Hello" }],
});
typescript after
import OpenAI from "openai";
const client = new OpenAI();
const response = await client.chat.completions.create({
model: "gpt-5.1-chat-latest",
messages: [{ role: "user", content: "Hello" }],
});
curl before
curl https://api.openai.com/v1/chat/completions \
-H "Authorization: Bearer $OPENAI_API_KEY" \
-H "Content-Type: application/json" \
-d '{"model":"chatgpt-4o-latest","messages":[{"role":"user","content":"Hello"}]}'
curl after
curl https://api.openai.com/v1/chat/completions \
-H "Authorization: Bearer $OPENAI_API_KEY" \
-H "Content-Type: application/json" \
-d '{"model":"gpt-5.1-chat-latest","messages":[{"role":"user","content":"Hello"}]}'
Checklist
- Read the shutdown date for chatgpt-4o-latest on the linked official page.
- Point your requests at gpt-5.1-chat-latest.
- Re-check price, context, and parameters on the provider pages linked here.
- Ship the change before the published shutdown date.