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GPT-5.3-Codex is OpenAI’s most advanced agentic coding model, combining the frontier software engineering performance of GPT-5.2-Codex with the broader reasoning and professional knowledge capabilities of GPT-5.2. $1.75 per million input tokens, $14 per million output tokens. 400,000 token context window, maximum output of 128,000 tokens. Higher uptime with 2 providers. Includes independent benchmarks from Artificial Analysis.
from openai import OpenAI client = OpenAI( base_url="https://api.respan.ai/api/", api_key="YOUR_RESPAN_API_KEY",) response = client.chat.completions.create( model="azure/gpt-5.3-codex", messages=[{"role": "user", "content": "Hello!"}],)print(response.choices[0].message.content)from openai import OpenAI client = OpenAI( base_url="https://api.respan.ai/api/", api_key="YOUR_RESPAN_API_KEY",) response = client.chat.completions.create( model="azure/gpt-5.3-codex", messages=[{"role": "user", "content": "Hello!"}],)print(response.choices[0].message.content)Gateway routes for this model on the Respan gateway, including fallback routes when configured.
| Model | Capabilities | ||||||
|---|---|---|---|---|---|---|---|
| azure/gpt-5.3-codex | 400K | $1.75/M | $14.00/M | Read:$0.17/MWrite:$0.00/M | — | +2 | — |
Other models from the same provider available through the gateway.
| Model | Capabilities | ||||||
|---|---|---|---|---|---|---|---|
| azure_openai/gpt-5.4 | 272K | $1.25/M | $10.00/M | Read:$0.25/MWrite:$0.00/M | — | +2 | — |
| azure/gpt-35-turbo | 16K | $0.50/M | $0.10/M | — | — | — | |
| azure/gpt-4 | 128K | $30.00/M | $60.00/M | — | — | — | |
| azure/gpt-4-1106-preview | 128K | $10.00/M | $30.00/M | — | — | — | |
| azure/gpt-4-32k | 128K | $30.00/M | $60.00/M | — | — | — | |
| azure/gpt-4-vision-preview | 128K | $10.00/M | $30.00/M | — | — | — | |
| azure/gpt-4.1 | 1M | $2.00/M | $8.00/M | — | 6.4s | 123tps | |
| azure/gpt-4.1-mini | 1M | $0.40/M | $1.60/M | — | 1.6s | 44tps | |
| azure/gpt-4.1-nano | 1M | $0.10/M | $0.40/M | — | 2.5s | 97tps | |
| azure/gpt-4o | 128K | $2.50/M | $10.00/M | Read:$1.25/MWrite:— | — | — | |
| azure/gpt-4o-2024-08-06 | 128K | $2.50/M | $10.00/M | Read:$1.25/MWrite:— | — | — | |
| azure/gpt-4o-mini | 128K | $0.15/M | $0.60/M | Read:$0.07/MWrite:— | 1.1s | 2tps |
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Use Respan with your favorite frameworks and tools.