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OpenAI: GPT-5.1-Codex-Max API Pricing
GPT-5.1-Codex-Max is OpenAI’s latest agentic coding model, designed for long-running, high-context software development tasks. It is based on an updated version of the 5.1 reasoning stack and trained on agentic...
How much does OpenAI: GPT-5.1-Codex-Max cost for a real workload?
At 10M input + 2M output tokens per month, OpenAI: GPT-5.1-Codex-Max costs about $32.5 ($12.5 input + $20 output). Try your own volumes in the cost calculator.
What are cheaper alternatives to OpenAI: GPT-5.1-Codex-Max?
- Google: Gemini 3.5 Flash — $1.5 in / $9 out per 1M
- Pareto 26.9 — $2.5 in / $7.5 out per 1M
- OpenAI: o3 — $2 in / $8 out per 1M
- OpenAI: GPT-4.1 — $2 in / $8 out per 1M
- Perplexity: Sonar Reasoning Pro — $2 in / $8 out per 1M
- Perplexity: Sonar Deep Research — $2 in / $8 out per 1M
Where to run OpenAI: GPT-5.1-Codex-Max
AI/ML API: one API key for 400+ models, including most models tracked here · Novita AI: pay-as-you-go APIs for open models (DeepSeek, Qwen, Llama and more) plus GPU cloud. Prices there follow each platform's own catalog and can differ from the list prices tracked here.
Run it on AI/ML API →Run it on Novita AI →
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Compare OpenAI: GPT-5.1-Codex-Max with other models
OpenAI: GPT-5.1-Codex-Max vs OpenAI: gpt-oss-20bOpenAI: GPT-5.1-Codex-Max vs OpenAI: gpt-oss-20b (batch)OpenAI: GPT-5.1-Codex-Max vs OpenAI: gpt-oss-120b (batch)OpenAI: GPT-5.1-Codex-Max vs OpenAI: GPT-5 Nano (batch)OpenAI: GPT-5.1-Codex-Max vs OpenAI: GPT-4.1 Nano (batch)OpenAI: GPT-5.1-Codex-Max vs OpenAI: GPT-6 Luna Pro (batch)
Frequently asked questions
How much does OpenAI: GPT-5.1-Codex-Max cost?
OpenAI: GPT-5.1-Codex-Max costs $1.25 per 1M input tokens and $10 per 1M output tokens (list price, snapshot October 22, 2026). At 10M input + 2M output tokens per month that is about $32.5.
What is the context window of OpenAI: GPT-5.1-Codex-Max?
OpenAI: GPT-5.1-Codex-Max has a context window of 400,000 tokens and can return up to 128,000 output tokens per response.
What are cheaper alternatives to OpenAI: GPT-5.1-Codex-Max?
Cheaper models include Google: Gemini 3.5 Flash ($1.5 in / $9 out), Pareto 26.9 ($2.5 in / $7.5 out), OpenAI: o3 ($2 in / $8 out). See the full list on this page.
Is OpenAI: GPT-5.1-Codex-Max free to use?
No. OpenAI: GPT-5.1-Codex-Max is a paid model at $1.25 input / $10 output per 1M tokens. 21 free models are listed on the free models page.
Provider: openai · Model ID: openai/gpt-5.1-codex-max · Modality: text+image->text · Price snapshot October 22, 2026, refreshed daily. How we collect prices