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GPT-5.1 Codex Max
openai·openai/gpt-5.1-codex-max·GA·Closed·gpt-codex series
Coding-optimized GPT model for repository edits, reviews, and agentic software work
At a glance
Reference price$2.50 / $20.00 per 1M
Cache read $0.25 · NanoGPT
Lowest paid$1.10 / $9.00
Poe Gateway · 2.3× spread
Context400,000
⚠ Providers report 256,000–400,000; the table below is authoritative
Output limit128,000
Capabilities
✓ Reasoning✓ Tool use✓ Structured outputTemperature✓ Attachments
⚠ Providers report capability flags inconsistently
Modalities
TextImagePDF
Knowledge cutoff2024-09-30
Released / updated2025-11-13 / 2025-11-13
Quality & performance
Artificial Analysis doesn't cover this model (267 of 2059 have data). Quality data comes from independent evals covering widely used models.
Available at 14 providers14 with public prices
| Provider | Tier | Input | Output | Cache read | Cache write | Context | Output limit | Status |
|---|---|---|---|---|---|---|---|---|
| Poe | Gateway | $1.10 | $9.00 | $0.11 | — | 400,000 | 128,000 | |
| Jiekou.AI | Gateway | $1.13 | $9.00 | — | — | 400,000 | 128,000 | |
| OrcaRouter | Gateway | $1.25 | $10.00 | $0.125 | — | 400,000 | 128,000 | |
| OpenRouter | Gateway | $1.25 | $10.00 | $0.125 | — | 400,000 | 128,000 | |
| Vivgrid | Gateway | $1.25 | $10.00 | $0.125 | — | 400,000 | 128,000 | |
| DigitalOcean openai-gpt-5.1-codex-max | Cloud | $1.25 | $10.00 | $0.125 | — | 400,000 | 128,000 | |
| Ofox | Gateway | $1.25 | $10.00 | $0.13 | — | 256,000 ⚠ | 128,000 | |
| OpenCode Zen | Gateway | $1.25 | $10.00 | $0.125 | — | 400,000 | 128,000 | |
| Azure | First-party | $1.25 | $10.00 | $0.125 | — | 400,000 | 128,000 | |
| Vercel AI Gateway | Cloud | $1.25 | $10.00 | $0.125 | — | 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.
Your usage cost
1Poe$551.20
2OrcaRouter$615.00
3OpenRouter$615.00
4Vivgrid$615.00
5DigitalOcean$615.00
6OpenCode Zen$615.00
The cheapest paid channel is the only channel.
Benchmark
No upstream benchmark data for this model. For quality, see the Artificial Analysis intelligence score above.
Reasoning control
effort = loweffort = mediumeffort = higheffort = xhigheffort = noneeffort = minimal
4 / 14 providers expose no reasoning control (reasoning_options: []).
Related models
GPT-5.3 Codexsame series$1.75 / $14.00GPT-5.3 Codex (OpenAI)same series$1.75 / $14.00GPT-5.3 Codex (Azure)same series$1.75 / $14.00GLM-5.2cheaper alternative$1.40 / $4.40Kimi K2.6cheaper alternative$0.95 / $4.00DeepSeek V4 Procheaper alternative$0.435 / $0.87DeepSeek V4 Flashcheaper alternative$0.14 / $0.28
Price historyone sample accumulated per data sync
Input listOutput listMin blended