OpenAI
GPT-5.1-Instant
Compact GPT model for low-latency assistance and high-volume workloads
Model facts
- Context window
- 128K tokens
- Maximum output
- 16K tokens
- Cheapest paid input
- $1.1 per 1M tokens
- Cheapest paid output
- $9 per 1M tokens
- Open weights
- no
- Providers
- 1
Capabilities and modalities
reasoning, tool calling, attachments, text, image.
Observed price history
- 2026-08-24: $1.1 input / $9 output per 1M tokens
API providers
- Poe — model id openai/gpt-5.1-instant; $1.1 input / $9 output per 1M tokens; provider documentation