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OpenAI: GPT-5.1 Chat.

multimodal closed 128K ctx
Cheapest input
$1.25/M
on OpenAI API
Cheapest output
$10.0/M
on OpenAI API
Hosted equiv.
~$3.6/hr
@ 100 tok/s on OpenAI API

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...

Hosted API only

No self-host path — closed weights.

OpenAI: GPT-5.1 Chat's weights aren't published. Use it via the access providers below.

Where to use it

Cheapest hosted endpoints.

Provider Access $/M in $/M out
OpenAI API api direct $1.25 $10.0 Launch ↗
OpenRouter api aggregator $1.25 $10.0 Launch ↗
FAQ

Frequently asked.

How do I run OpenAI: GPT-5.1 Chat?
OpenAI: GPT-5.1 Chat is a closed-source API model. The cheapest way to access it is through the API providers listed on this page (direct API, aggregators, and hosted chat UIs).
Where can I access OpenAI: GPT-5.1 Chat?
OpenAI: GPT-5.1 Chat is available via OpenAI API, OpenRouter. Each access option lists its own pricing (per million tokens or hourly hosting).
How much does it cost to run OpenAI: GPT-5.1 Chat?
API pricing starts at $1.25/M input tokens and $10.0/M output tokens. Self-hosting cost depends on the GPU you rent — see the Run It Yourself tab.
Is OpenAI: GPT-5.1 Chat open-source or proprietary?
OpenAI: GPT-5.1 Chat is a proprietary model from OpenAI. Access is API-only — there are no public weights to download.