Coding-optimized GPT model for repository edits, reviews, and agentic software work
GPT-5.1 Codex Max by openai is offered by 14 providers on this page. Its reference price is $2.50 per 1M input tokens and $20.00 per 1M output tokens. The lowest paid channel is Ofox at $1.00 / $8.00 per 1M, about 2.5× below the reference price. That channel is a third-party gateway, so confirm its availability and rate limits before depending on it.
The context window is 400,000 tokens at the reference host, but hosts report different limits, from 256,000 to 400,000, so the usable window depends on the provider you pick. It supports reasoning, tool use, and structured output. Accepted input modalities are Text, Image, and PDF. Providers report the capability flags inconsistently, so verify a specific feature against the host you plan to use. Its training knowledge cuts off at 2024-09-30.
| Provider | Tier | Input | Output | Cache read | Cache write | Context | Output limit | Status |
|---|---|---|---|---|---|---|---|---|
| Ofox | Gateway | $1.00 | $8.00 | $0.10 | — | 256,000 ⚠ | 128,000 | |
| Poe | Gateway | $1.10 | $9.00 | $0.11 | — | 400,000 | 128,000 | |
| Jiekou.AI | Gateway | $1.13 | $9.00 | — | — | 400,000 | 128,000 | |
| Kilo Gateway | Gateway | $1.25 | $10.00 | $0.13 | — | 400,000 | 128,000 | |
| Abacus | Gateway | $1.25 | $10.00 | — | — | 400,000 | 128,000 | |
| OpenRouter | Gateway | $1.25 | $10.00 | $0.13 | — | 400,000 | 128,000 | |
| Azure | Cloud | $1.25 | $10.00 | $0.13 | — | 400,000 | 128,000 | |
| Azure Cognitive Services | Cloud | $1.25 | $10.00 | $0.13 | — | 400,000 | 128,000 | |
| Vercel AI Gateway | Cloud | $1.25 | $10.00 | $0.13 | — | 400,000 | 128,000 | |
| OpenCode Zen | Gateway | $1.25 | $10.00 | $0.13 | — | 400,000 | 128,000 | |
Sorted by blended price (input×0.75 + output×0.25) asc. The official channel always shows regardless of rank. Whether a gateway's low price is actually usable can't be verified.
3 / 14 providers expose no reasoning control (reasoning_options: []).