Last refreshed 2026-06-04. Next refresh: weekly.
Why use GPT-5.1 on OpenAI API?
OpenAI API offers GPT-5.1 with pay-as-you-go pricing at $1.25/1M input tokens. OpenAI is a leading AI research and deployment company dedicated to developing safe and beneficial artificial general intelligence (AGI) for humanity.
Compare GPT-5.1 across 2 providers to find the best fit for your use caseInput / 1M
$1.25
Output / 1M
$10.00
Cache
read $0.125
Batch
-50% · in $0.625 / out $5.00
Setup recipe
Python + curlInstall
pip install openaiAuth
export OPENAI_API_KEY=...Call
import os
from openai import OpenAI
client = OpenAI() # reads OPENAI_API_KEY from env
response = client.chat.completions.create(Model ID
gpt-5.1Request example
import os
from openai import OpenAI
client = OpenAI() # reads OPENAI_API_KEY from env
response = client.chat.completions.create(
model="gpt-5.1",
messages=[{"role": "user", "content": "Hello"}]
)
print(response.choices[0].message.content)Gotchas
- Use the model slug directly, e.g. "gpt-4o" or "gpt-4.1-mini".
- The examples expect OPENAI_API_KEY; rename it only if your application config maps the new variable.
Compare GPT-5.1 Across Providers
| Provider | Input (per 1M) | Output (per 1M) |
|---|---|---|
| OpenRouter | $1.25 | $10.00 |
| OpenAI API | $1.25 | $10.00 |
Pricing
| Type | Price (per 1M) |
|---|---|
| Input tokens | $1.25 |
| Output tokens | $10.00 |
Capabilities
VisionMultimodalReasoningJSON / Tool useStructured Outputs
About GPT-5.1
OpenAI's GPT-5.1 is the main thinking model in the GPT-5.1 family, released November 13, 2025 via API (ChatGPT rollout began November 12, 2025). Features adaptive reasoning that dynamically adjusts thinking time by task complexity, with a reasoning_effort parameter supporting none/low/medium/high settings. Deprecated in ChatGPT as of March 11, 2026 in favor of newer models.
Get Started
Model Specs
Released2025-11-13
Context262k