openai/gpt-5.1-codex-max
400,000 context · $1.25/M input tokens · $10.00/M output tokens
GPT-5.1-Codex-Max is OpenAI’s latest agentic coding model, designed for long-running, high-context software development tasks. It is based on an updated version of the 5.1 reasoning stack and trained on agentic...
Pricing
Pay-per-use
No upfront costs, pay only for what you use
Try the model
API Usage
Use the following code examples to integrate with our API:
from openai import OpenAI
client = OpenAI(
api_key="YOUR_API_KEY",
base_url="https://llm.wavespeed.ai/v1"
)
response = client.chat.completions.create(
model="openai/gpt-5.1-codex-max",
messages=[
{"role": "user", "content": "Hello!"}
]
)
print(response.choices[0].message.content)Model Introduction
Openai gpt-5.1-codex-max
openai gpt-5.1-codex-max
Why It Looks Great
- Large Language Model architecture for efficient processing
- 400000 context window for long document handling
- Competitive pricing at $1.4/$11.0 per million tokens
Key Features
- Context Window: 400000 tokens
- Max Output: 128000 tokens
- Vision: Supported
- Function Calling: Supported
Specifications
| Specification | Value |
|---|---|
| Provider | Openai |
| Model Type | Large Language Model (LLM) |
| Architecture | N/A |
| Context Window | 400000 tokens |
| Max Output | 128000 tokens |
| Input | Text |
| Output | Text |
| Vision | Supported |
| Function Calling | Supported |
Pricing
| Token Type | Cost per Million Tokens |
|---|---|
| Input | $1.4 |
| Output | $11.0 |
How to Use
- Write your prompt — describe the task, provide context, and specify desired output format.
- Submit — the model processes your request and returns the response.
API Integration
Base URL: https://llm.wavespeed.ai/v1 API Endpoint: chat/completions Model ID: openai/gpt-5.1-codex-max
API Usage
Python SDK
from openai import OpenAI
client = OpenAI(
api_key="YOUR_API_KEY",
base_url="https://llm.wavespeed.ai/v1"
)
response = client.chat.completions.create(
model="openai/gpt-5.1-codex-max",
messages=[
{"role": "user", "content": "Hello!"}
]
)
print(response.choices[0].message.content)cURL
curl https://llm.wavespeed.ai/v1/chat/completions \
-H "Content-Type: application/json" \
-H "Authorization: Bearer YOUR_API_KEY" \
-d '{
"model": "openai/gpt-5.1-codex-max",
"messages": [{"role": "user", "content": "Hello!"}]
}'Notes
- Model: openai/gpt-5.1-codex-max
- Provider: Openai
Info
Supported Functionality
API Access Guide
GPT 5.1 Codex Max API
openai/gpt-5.1-codex-max
GPT-5.1-Codex-Max is OpenAI’s latest agentic coding model, designed for long-running, high-context software development tasks. It is based on an updated version of the 5.1 reasoning stack and trained on agentic...
Input
$1.25 /M
Output
$10 /M
Context
400K
Max Output
128K
Vision
Supported
Tool Use
Supported
Try GPT 5.1 Codex Max on WaveSpeedAI
Access GPT 5.1 Codex Max through our unified API — OpenAI-compatible, no cold starts, transparent pricing.
Frequently Asked Questions about GPT 5.1 Codex Max
How much does GPT 5.1 Codex Max cost via the API?+
Pricing on WaveSpeedAI: $1.25 per million input tokens and $10.00 per million output tokens. Prompt caching and batch processing are billed separately and reduce effective cost on long, repetitive workloads.
What is the context window of GPT 5.1 Codex Max?+
GPT 5.1 Codex Max supports up to 400K tokens of context with up to 128K tokens of output per request.
Is GPT 5.1 Codex Max OpenAI-compatible?+
Yes. WaveSpeedAI exposes GPT 5.1 Codex Max through an OpenAI-compatible endpoint at https://llm.wavespeed.ai/v1. Point the official OpenAI SDK at this base URL with your WaveSpeedAI API key — no other code changes required.
How do I get started with GPT 5.1 Codex Max?+
Sign in to WaveSpeedAI, create an API key in Access Keys, then send a request to https://llm.wavespeed.ai/v1/chat/completions with model id set to the value shown above. New accounts receive free credits to evaluate GPT 5.1 Codex Max before paying per token.