Is gpt-5.1 cheaper than gpt-4o-2024-11-20?

A full price comparison is not published. One or both prices are missing from the official pages we checked.

Does gpt-5.1 have a bigger context window than gpt-4o-2024-11-20?

Context window sizes are not both published on the official pages we checked.

gpt-4o (2024-11-20) to gpt-5.1: price, context, and code

The official replacement is gpt-5.1. gpt-4o (2024-11-20) (gpt-4o-2024-11-20) shuts down on 2027-04-14 per Azure OpenAI's deprecation page (checked 2026-10-17). Price, context window, and max output were left blank because the official pages we checked did not publish them.

gpt-4o (2024-11-20) to gpt-5.1

Some values not published Checked 2026-10-17.

Price per 1M tokens

Price comparison. Example monthly cost for 10M input tokens and 2M output tokens. Labeled example, not a bill.
Field	Old	New	Change
Input	Not published	Not published	Not published
Output	Not published	Not published	Not published
Cached input	Not published	Not published	Not published
Example monthly cost	Not published	Not published	Example only

Context and max output

Token limits
Limit	Old	New	Change
Context window	Not published	Not published	Not published
Max output	Not published	Not published	Not published

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 typescript curl

python before

from openai import OpenAI
client = OpenAI()
response = client.chat.completions.create(
    model="gpt-4o-2024-11-20",
    messages=[{"role": "user", "content": "Hello"}],
)

python after

from openai import OpenAI
client = OpenAI()
response = client.chat.completions.create(
    model="gpt-5.1",
    messages=[{"role": "user", "content": "Hello"}],
)

typescript before

import OpenAI from "openai";
const client = new OpenAI();
const response = await client.chat.completions.create({
  model: "gpt-4o-2024-11-20",
  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",
  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":"gpt-4o-2024-11-20","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","messages":[{"role":"user","content":"Hello"}]}'

Checklist

Read the shutdown date for gpt-4o-2024-11-20 on the linked official page.
Point your requests at gpt-5.1.
Re-check price, context, and parameters on the provider pages linked here.
Ship the change before the published shutdown date.

Replacement for gpt-4o (2024-11-20): what changes when you switch