AI Observatory / Model Radar
OpenAI / openai/gpt-5.1-chat
OpenAI: GPT-5.1 Chat
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...
128,000
Context
16,384
Max output
$1.25 / 1M
Prompt price
2025-11-13
Created
01 / Snapshot
Pricing, context, modalities, and parameters.
Model Radar detail pages stay neutral and operator-readable: core metadata first, then workflow fit.
| Provider | OpenAI | Input modalities | file, image, text |
|---|---|---|---|
| Output modalities | text | Prompt price | $1.25 / 1M |
| Completion price | $10.00 / 1M | Request price | N/A |
| Context length | 128,000 | Max completion tokens | 16,384 |
| Supported parameters | max_completion_tokens, max_tokens, response_format, seed, structured_outputs, tool_choice, tools | ||
Best for
openai/gpt-5.1-chat
OpenAI: GPT-5.1 Chat
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...
Deep analysis
Cross-modal work
High-volume usage
Coding workflows
vision
tool-capable
low-cost
03 / Colophon
Routes and exits.
Each model page stays simple: overview, compare, related models, then back to the public hub.