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GPT API
OpenAI’s GPT and o-series reasoning models behind one base URL. Use the OpenAI SDK you already have — just change the base URL and key — and compare versions, context and pricing side by side.
55 models3 free at $0OpenAI- & Anthropic-compatiblePay-as-you-go
| Model | Tier | Context | Price in / out (1M) | |
|---|---|---|---|---|
| GPT 3.5 | Paid | — | $1.05 / $3.30 | View |
| GPT 3.5 Turbo 16k | Paid | — | — | View |
| GPT 4 | Paid | 8K | $6.42 / $12.84 | View |
| GPT 4 | Paid | — | $2.13 / $4.29 | View |
| GPT 4 | Paid | — | $2.13 / $4.29 | View |
| GPT 4 32k | Paid | — | — | View |
| GPT 4 Turbo | Paid | 128K | $2.13 / $6.42 | View |
| GPT 4 Vision | Paid | — | $2.13 / $4.29 | View |
| GPT 4.1 | Paid | 1M | $0.12 / $0.45 | View |
| GPT 4.1 Nano | Paid | — | — / $0.03 | View |
| GPT 4o Audio | Paid | — | — | View |
| GPT 4o Mini | Free | — | $0.20 / $0.20 | View |
| GPT 4o Mini Audio | Paid | — | — | View |
| GPT 4o Mini Realtime | Paid | — | — | View |
| GPT 4o Mini Search | Paid | — | $0.30 / $1.35 | View |
| GPT 4o Mini Transcribe | Paid | — | $0.33 / $1.29 | View |
| GPT 4o Mini Tts | Paid | — | $64.26 / $64.26 | View |
| GPT 4o Realtime | Paid | — | — | View |
| GPT 4o Search | Paid | — | $5.55 / $22.05 | View |
| GPT 4o Transcribe | Paid | — | $0.54 / $2.13 | View |
| GPT 4o Transcribe Diarize | Paid | — | — | View |
| GPT 5 | Paid | 400K | $0.15 / $1.11 | View |
| GPT 5 Chat | Paid | — | $16.08 / $128.52 | View |
| GPT 5 Codex | Paid | 400K | $0.15 / $1.11 | View |
| GPT 5 Nano | Paid | — | — / $0.09 | View |
| GPT 5.1 | Paid | 400K | $0.15 / $1.11 | View |
| GPT 5.1 Chat | Paid | — | $0.27 / $2.13 | View |
| GPT 5.1 Codex Mini | Paid | — | $1.20 / $9.57 | View |
| GPT 5.2 | Paid | — | $0.18 / $1.56 | View |
| GPT 5.2 Chat | Paid | 400K | $0.36 / $3.00 | View |
| GPT 5.2 Codex | Paid | — | $0.03 / $0.12 | View |
| GPT 5.3 Chat | Paid | — | $0.36 / $3.00 | View |
| GPT 5.3 Codex | Paid | — | $0.75 / $4.20 | View |
| GPT 5.4 | Paid | — | $1.25 / $7.50 | View |
| GPT 5.4 Mini | Paid | — | $0.45 / $2.20 | View |
| GPT 5.4 Nano | Paid | — | $0.14 / $0.75 | View |
| GPT 5.4 Pro | Paid | — | $15.00 / $90.00 | View |
| GPT 5.5 | Paid | — | $1.20 / $6.00 | View |
| GPT 5.6 Luna | Paid | — | $0.85 / $4.60 | View |
| GPT 5.6 Sol | Paid | — | $4.20 / $23.00 | View |
| GPT 5.6 Terra | Paid | — | $2.10 / $11.50 | View |
| GPT Audio | Paid | 128K | $16.08 / $32.13 | View |
| GPT Audio 1.5 | Paid | — | — | View |
| GPT Oss 120b | Free | 131K | $0.10 / $0.40 | View |
| GPT Oss 20b | Free | 131K | — / $0.10 | View |
| GPT Realtime | Paid | — | $16.08 / $32.13 | View |
| GPT Realtime 1.5 | Paid | — | — | View |
| O1 | Paid | — | $0.84 / $3.33 | View |
| O3 | Paid | 200K | $0.21 / $0.87 | View |
| O3 Deep Research | Paid | — | — | View |
| O3 Mini | Paid | — | $2.91 / $11.64 | View |
| O3 Mini 01.31 | Paid | 200K | $2.91 / $11.64 | View |
| O4 | Paid | 200K | $0.12 / $0.48 | View |
| O4 Mini | Paid | 200K | $0.99 / $3.90 | View |
| O4 Mini Deep Research | Paid | — | — | View |
Call GPT in three lines
Same code as the OpenAI SDK — change the base URL and key, pick a model id:
from openai import OpenAI
client = OpenAI(
base_url="https://api.airforce/v1",
api_key="YOUR_KEY",
)
resp = client.chat.completions.create(
model="gpt-3.5",
messages=[{"role": "user", "content": "Hello!"}],
)
print(resp.choices[0].message.content)Frequently asked questions
- How do I use GPT models through Api.Airforce?
- Point any OpenAI-compatible client at https://api.airforce/v1 and set the model id (for example "gpt-3.5"). Your existing OpenAI SDK works unchanged — you only swap the base URL and API key. The same key also speaks the Anthropic Messages API.
- Are any GPT models free?
- Yes — 3 of the 55 GPT models are on the free tier and callable at $0 (for example GPT 4o Mini, GPT Oss 120b, GPT Oss 20b). A free account needs no credit card; the remaining models are pay-as-you-go.
- How much do GPT models cost on Api.Airforce?
- Billing is pay-as-you-go per token, at rates that sit well below the official APIs. The exact per-model input and output prices are listed in the table above and update automatically as upstream prices change.
- Which GPT models are available?
- Currently 55 GPT models, including GPT 3.5, GPT 3.5 Turbo 16k, GPT 4. The catalog is refreshed as new models launch, so the list above is always current.