Released 2026-01
Codex 5.1 Max
Codex 5.1 的最大推理版本，深度思考模式下能完成复杂的多步代码任务。相比 5.3 思考链路更深但速度更慢。适合架构设计、复杂算法实现、长周期 agent 任务。
Context window
400K
tokens
Max output
128K
tokens
Input price
$1.13
/ 1M tokens
Output price
$9.00
/ 1M tokens
Core capabilities
Code generation
Chain-of-thought reasoning
Function calling
Streaming output
Long context
Tool use
Recommended use cases
系统架构设计
复杂算法/数据结构实现
多文件跨模块重构
长周期代码 agent
安全审计与漏洞分析
性能优化研究
Quick start
Replace base_url and api_key below with your own to call Codex 5.1 Max. Fully OpenAI SDK compatible — no other code changes needed.
curl https://api.nodebyt.com/v1/chat/completions \
-H "Content-Type: application/json" \
-H "Authorization: Bearer sk-your-key" \
-d '{
"model": "gpt-5.1-codex-max",
"messages": [{"role": "user", "content": "Hello"}]
}'Other OpenAI models
FAQ
Q: How is Codex 5.1 Max priced?
A: Pay per token: $1.13/M input, $9.00/M output. No monthly fee, no minimum spend. Credits never expire.
Q: How do I integrate Codex 5.1 Max? Any code changes?
A: Fully OpenAI-compatible — just swap base_url and api_key. Claude models also support the native Anthropic /v1/messages format. See the code snippets above.
Q: Is Codex 5.1 Max stable through Nodebyt?
A: All requests go through our API gateway (api.nodebyt.com) with optimized third-party backbone routing. Average latency under 200ms, reliable under any network condition.
Q: What use cases does Codex 5.1 Max support?
A: Recommended: 系统架构设计、复杂算法/数据结构实现、多文件跨模块重构、长周期代码 agent、安全审计与漏洞分析、性能优化研究. Compare with other models from the same provider for your specific needs.
Q: Does Codex 5.1 Max have a free tier?
A: New users get free credits after email verification, ready for immediate API testing. Top up from $10 afterwards, pay as you go.
Get started with Codex 5.1 Max
Free credits on sign-up. Pay as you go. $10 minimum top-up, no expiration.
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