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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
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 21, 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. 20 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 21, 2026, refreshed daily. How we collect prices