GPT-5.1 Codex Max — Benchmark Scores, Pricing & Performance Analysis
GPT-5.1 Codex Max is an AI model by Azure. View detailed benchmark scores, pricing data, and performance metrics on Serenities AI Models.
Specifications last checked against the provider on . Benchmark scores carry their own source, linked beside each number.
Cost Benchmarks
Cost per 1M cached input tokens — the price that actually applies to a long agent conversation
OpenRouter APIContext Benchmarks
Available from 13 providers
The same model costs different amounts depending on who serves it. You can bring your own key for 3 of these — connect it here.
| Provider | Input / 1M | Output / 1M | Cached in | Context | Your key |
|---|---|---|---|---|---|
| Poe | $1.1 | $9 | $0.11 | 400K | — |
| Jiekou.AI | $1.125 | $9 | — | 400K | — |
| Abacus | $1.25 | $10 | — | 400K | — |
| Azure | $1.25 | $10 | $0.125 | 400K | Supported |
| DigitalOcean | $1.25 | $10 | $0.125 | 400K | — |
| Eden AI | $1.25 | $10 | $0.125 | 272K | — |
| Kilo Gateway | $1.25 | $10 | $0.125 | 400K | — |
| Ofox | $1.25 | $10 | $0.13 | 256K | — |
| OpenCode Zen | $1.25 | $10 | $0.125 | 400K | — |
| OpenRouter | $1.25 | $10 | $0.125 | 400K | Supported |
| Vercel AI Gateway | $1.25 | $10 | $0.125 | 400K | Supported |
| Vivgrid | $1.25 | $10 | $0.125 | 400K | — |
| NanoGPT | $2.5 | $20 | $0.25 | 400K | — |
GPT-5.1 Codex Max — Frequently Asked Questions
How much does GPT-5.1 Codex Max cost?
GPT-5.1 Codex Max costs $1.3 per 1M input tokens and $10.0 per 1M output tokens. This is mid-range pricing for its capability level.
What is the context window of GPT-5.1 Codex Max?
GPT-5.1 Codex Max has a context window of 400K tokens. This determines how much text, conversation history, and code the model can process in a single request.
Who created GPT-5.1 Codex Max?
GPT-5.1 Codex Max was created by Azure. It is classified as a mid model in our catalogue.
Is GPT-5.1 Codex Max open source?
No, GPT-5.1 Codex Max is a proprietary model. It is available through Azure's API and compatible providers.