GPT-5.1 Chat
ActiveGPT-5.1 Chat (AKA Instant is the fast, lightweight member of the 5.1 family, optimized for low-latency chat while retaining strong general intelligence. It uses adaptive reasoning to selectively “think” on...
Overview
GPT-5.1 Chat (AKA Instant is the fast, lightweight member of the 5.1 family, optimized for low-latency chat while retaining strong general intelligence. It uses adaptive reasoning to selectively “think” on...
History
GPT-5.1 Chat became available via the OpenAI API on 2025-11-13.
Training & availability
OpenAI has not released the underlying model weights — access is via their hosted API only.
Capabilities
-
Context window: 128K tokens.
-
Input modalities: file, image, text.
Recommended for: vision.
Pricing
- Input: $1.2500 per 1M tokens
- Output: $10.0000 per 1M tokens
Use the cost calculator above to estimate monthly spend for your workload.
Quick start
Minimal example using the openai API. Copy, paste, replace the key.
from openai import OpenAI
client = OpenAI(api_key="sk-...")
resp = client.chat.completions.create(
model="gpt-5-1-chat",
messages=[{"role": "user", "content": "Explain quantum computing in one sentence."}],
)
print(resp.choices[0].message.content)Cost calculator
Estimate your monthly bill. Presets are typical workload sizes.
Integrations & tooling support
- Tool calling
- Not supported
- Structured outputs
- Not supported
Price vs quality
This model has no benchmark scores recorded yet.
Community ratings
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Comments
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