GPT-5.1

GPT-5.1 is a model in OpenAI's GPT line, described as a sharper GPT-5 generation for coding, product work, and tool-assisted tasks. It has a context window of 400,000 tokens and a maximum output of 128,000 tokens. It accepts image and text inputs and returns text. It supports reasoning mode and tool calling. The weights are not open. Pricing starts at $1.00 per million input tokens and $8.00 per million output tokens, with cached input at $0.104 per million tokens.

Same headline figures as GPT-5.

Range across the hosts that serve it: up to $2.50 per 1M input tokens.

• ·400,000 token context window
• ·128,000 token maximum output
• ·Supports reasoning mode and tool calling
• ·Accepts image and text inputs

• Reach for it for coding tasks
• Reach for it for product work
• Reach for it for tool-assisted tasks

28 hosts serve this model at the price above · the maker's documentation

• 72026 in LLMs (so far)2026-09-28

1 signal of the archive mention this model, each scored against the published bar. This list is rebuilt from the archive at every build, so it cannot go stale.

The registry keeps the six most recent versions of a line. Older ones stay in the file and can be surfaced without a rebuild.

What are the context window and maximum output?

Context window is 400,000 tokens, maximum output is 128,000 tokens.

Does it support image inputs?

Yes, it accepts image and text inputs and returns text.

What is the pricing?

Input from $1.00 per million tokens, output from $8.00 per million tokens, cached input from $0.104 per million tokens.