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OpenAI: GPT-5.1-Codex API Pricing
GPT-5.1-Codex is a specialized version of GPT-5.1 optimized for software engineering and coding workflows. It is designed for both interactive development sessions and long, independent execution of complex engineering tasks....
How much does OpenAI: GPT-5.1-Codex cost for a real workload?
At 10M input + 2M output tokens per month, OpenAI: GPT-5.1-Codex costs about $32.5 ($12.5 input + $20 output). Try your own volumes in the cost calculator.
What is the official OpenAI: GPT-5.1-Codex price?
| Official (openai) | Catalog (OpenRouter) | |
|---|---|---|
| Input /1M | $1.25 | $1.25 |
| Output /1M | $10 | $10 |
| Cached input /1M | $0.125 | $0.13 |
✓ Matches the official list price. Source: openai official pricing page, checked 2026-10-21.
What are cheaper alternatives to OpenAI: GPT-5.1-Codex?
- 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
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 with other models
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Frequently asked questions
How much does OpenAI: GPT-5.1-Codex cost?
OpenAI: GPT-5.1-Codex 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?
OpenAI: GPT-5.1-Codex 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?
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 free to use?
No. OpenAI: GPT-5.1-Codex is a paid model at $1.25 input / $10 output per 1M tokens. 21 free models are listed on the free models page.
What is the official price of OpenAI: GPT-5.1-Codex?
On openai's official pricing page (checked 2026-10-21), OpenAI: GPT-5.1-Codex is listed at $1.25 per 1M input tokens and $10 per 1M output tokens. The catalog price tracked on this page matches it exactly.
Provider: openai · Model ID: openai/gpt-5.1-codex · Modality: text+image->text · Price snapshot October 22, 2026, refreshed daily. How we collect prices