OpenAIPaidOperational
Gpt 5.1
API model name: gpt-5.1
Gpt 5.1 is OpenAI's chat model, served on the Api.Airforce unified API. It has a 400K-token context window. Beyond text, it accepts image as input. Capabilities include Vision, Tool calling, Reasoning, Documents, Prompt caching. It is priced at $0.27 per million input tokens and $2.13 per million output tokens. Knowledge cutoff: 2025-09. Access it through the OpenAI-compatible API with one key, alongside 65+ other models on Api.Airforce.
Pricing
Specifications
- Provider
- OpenAI
- Type
- chat model
- Context window
- 400K tokens
- Max output
- 128K tokens
- Knowledge cutoff
- 2025-09
- Input
- text, image
- Output
- text
- Prompt caching
- Supported
Capabilities
VisionTool callingReasoningDocumentsPrompt cachingStreaming
What is Gpt 5.1 used for?
- Chatbots & assistants — conversational AI, drafting, summarizing and Q&A.
- Image understanding — analyze photos, screenshots, charts and scanned documents.
- Agents & automation — function calling and tool use for multi-step workflows.
- Complex reasoning — math, coding and step-by-step problem solving.
- Document analysis — summarize and answer questions across long files.
- Long-context tasks — process entire documents or codebases in a single prompt.
- Real-time experiences — stream tokens for responsive chat and apps.
Gpt 5.1 vs. similar models
| Model | Context | Input / 1M | Output / 1M |
|---|---|---|---|
| Gpt 5.1 | 400K | $0.27 | $2.13 |
| Gpt 3.5 | — | — | — |
| Gpt 3.5 Turbo 16k | — | — | — |
| Gpt 4 | 8K | $6.42 | $12.84 |
Prices are Api.Airforce pay-as-you-go rates per 1M tokens. Context is the maximum input length.
Related models
Chatgpt ImageOpenAIDall E 2OpenAI · $10.00 / 1MDall E 3OpenAI · $20.00 / 1MGpt 3.5OpenAIGpt 3.5 Turbo 16kOpenAIGpt 4OpenAI · $6.42 / 1MGpt 4 0125OpenAI · $2.13 / 1MGpt 4 1106OpenAI · $2.13 / 1MGpt 4 32kOpenAIGpt 4 AllOpenAI · $5.13 / 1MGpt 4 TurboOpenAI · $2.13 / 1MGpt 4 VisionOpenAI · $2.13 / 1M
Gpt 5.1 — frequently asked questions
- How much does Gpt 5.1 cost?
- Gpt 5.1 is billed pay-as-you-go at $0.27 per 1M input tokens and $2.13 per 1M output tokens. There is no subscription — you only pay for what you use.
- What is the context window of Gpt 5.1?
- Gpt 5.1 supports a context window of up to 400K tokens. It can return up to 128K tokens in a single response.
- What can Gpt 5.1 do?
- Gpt 5.1 supports Vision, Tool calling, Reasoning, Documents, Prompt caching.
- Is Gpt 5.1 free to use?
- Gpt 5.1 is a paid, pay-as-you-go model — no subscription, you are only charged for usage.
- How do I use Gpt 5.1 via the API?
- Gpt 5.1 is OpenAI-compatible. Point any OpenAI SDK at https://api.airforce/v1 and pass the model ID gpt-5.1 with your Api.Airforce API key.
- Who makes Gpt 5.1?
- Gpt 5.1 is OpenAI's chat model, served through the unified Api.Airforce gateway alongside 65+ other models.
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Use Gpt 5.1 via the API
OpenAI-compatible — point any OpenAI SDK at https://api.airforce/v1 and pass gpt-5.1 as the model.
cURL
curl https://api.airforce/v1/chat/completions \
-H "Authorization: Bearer $AIRFORCE_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "gpt-5.1",
"messages": [{ "role": "user", "content": "Hello!" }]
}'Python
from openai import OpenAI
client = OpenAI(base_url="https://api.airforce/v1", api_key="$AIRFORCE_API_KEY")
r = client.chat.completions.create(
model="gpt-5.1",
messages=[{"role": "user", "content": "Hello!"}],
)
print(r.choices[0].message.content)JavaScript
import OpenAI from "openai";
const client = new OpenAI({ baseURL: "https://api.airforce/v1", apiKey: process.env.AIRFORCE_API_KEY });
const r = await client.chat.completions.create({
model: "gpt-5.1",
messages: [{ role: "user", content: "Hello!" }],
});
console.log(r.choices[0].message.content);