GPT-5.1 Codex Max
GPT-5.1 Codex Max is worth evaluating for coding, agents, and vision when its provider route and context window match the workload.
Use it for
- Teams evaluating coding, agents, and vision
- Buyers comparing 1 tracked provider route
Do not use it for
- Workloads where another current model has stronger sourced task evidence
- Family
- GPT-5.1
- Released
- 2025-11-19
- Knowledge cutoff
- 2024-09
- Specialization
- code
- Openness
- Proprietary
- License
- ProprietaryCommercial use: conditional
- Weights
- Not released
- Code
- Unknown
Cheapest of 1 route · Vercel AI Gateway · cache read $0.125
About
OpenAI's GPT-5.1-Codex-Max is a code-specialized model released November 19, 2025, optimized for agentic coding tasks including project-scale refactors, debugging, and multi-file edits. Uses context compaction to handle long-running tasks beyond a single context window. 30% more token-efficient than previous Codex on SWE-bench. Supports an extra-high reasoning effort option.
GPT-5.1 Codex Max is a proprietary model in the GPT-5.1 family. The structured metadata tracks multimodal input, reasoning, function calling, tool use, and structured outputs. This page tracks provider routes through Vercel AI Gateway, with the cheapest tracked route listed at $1.25 input and $10 output per 1M tokens. No headline benchmark score is tracked for GPT-5.1 Codex Max yet.
Top use-case fit: coding, agents, and build tasks
Coding
Included by capability and metadata signals in the decision map.
Agents
Included by capability and metadata signals in the decision map.
Vision
Included by capability and metadata signals in the decision map.
Provider price ladder
Compare API pricing across 1 providers for input and output tokens, batch, and cached reads when available.
| Provider | Input / 1M | Output / 1M | Cache | Route |
|---|---|---|---|---|
| Vercel AI Gateway | $1.25 | $10.00 | read $0.125 | Serverless |
Capabilities
Benchmark peer barsfor Coding
No task-mapped benchmark peers are available for this model yet.
Migration checks
No linked migration route is available for this model yet.
Compare GPT-5.1 Codex Max with other models
Frequently asked questions
How much does GPT-5.1 Codex Max cost?
GPT-5.1 Codex Max is available at $1.25/1M input tokens through Vercel AI Gateway.
When was GPT-5.1 Codex Max released?
GPT-5.1 Codex Max was released on 2025-11-19.
Which providers offer GPT-5.1 Codex Max?
GPT-5.1 Codex Max is available from 1 provider: Vercel AI Gateway.
Cheapest of 1 route · Vercel AI Gateway · cache read $0.125