GPT-5.1 Chat pricing & benchmarks
Released Nov 13, 2025 · served by 1 provider
What GPT-5.1 Chat is
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...
- Model ID:
openai/gpt-5.1-chat - Modality: text+image+file->text
- Tool calling: supported · Structured output: supported
Providers and prices for GPT-5.1 Chat
The same model costs different amounts depending on who serves it. Prices are per 1M tokens, cheapest first. Uptime and throughput are OpenRouter's rolling measurements, not vendor claims.
| Provider | Input | Output | Context | Quant | Uptime 24h | Throughput |
|---|---|---|---|---|---|---|
| Azurecheapest | $1.25 | $10.00 | 128K | — | — | — |
FAQ
How much does the GPT-5.1 Chat API cost?
$1.25 per 1M input tokens and $10.00 per 1M output tokens. A typical workload of 1M input + 300K output tokens costs about $4.25.
Is GPT-5.1 Chat free?
No. It is a paid model starting at $1.25 per 1M input tokens, though some providers offer trial credits.
Which provider is cheapest for GPT-5.1 Chat?
Azure at $1.25 input / $10.00 output per 1M tokens.
Can I self-host GPT-5.1 Chat?
No. GPT-5.1 Chat is closed-weight and only available through hosted APIs.