GPT-5.1-Codex-Mini API Cost Calculator
Estimate your monthly API costs for GPT-5.1-Codex-Mini from Openai.
Pricing per 1M tokens
Pricing last verified: Mar 21, 2026
30-Day Price History
Solid line: input price · Dashed line: output price
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Cost Breakdown
Compare with Similar Models
| Model | Input/1M | Output/1M |
|---|---|---|
| GPT-5 Mini Openai | $0.2500 | $2.00 |
| GPT-IMAGE-1-MINI Openai | $2.00 | $0.2000 |
| GPT-3.5 Turbo Openai | $0.5000 | $1.50 |
| GPT-4.1 Mini Openai | $0.4000 | $1.60 |
| GPT-5.4OUR Openai | $2.50 | $0.2500 |
Frequently Asked Questions
How much does GPT-5.1-Codex-Mini cost per token?
GPT-5.1-Codex-Mini is priced at $0.2500 per 1M input tokens and $2.00 per 1M output tokens. Use the calculator above to estimate your monthly costs based on your usage volume.
What is the context window for GPT-5.1-Codex-Mini?
GPT-5.1-Codex-Mini has a context window of 400K tokens (400,000 tokens). The maximum output length is 100K tokens.
Does GPT-5.1-Codex-Mini support image inputs (vision)?
Yes, GPT-5.1-Codex-Mini supports vision/image inputs. You can send images as part of your prompts.
Does GPT-5.1-Codex-Mini support function calling (tool use)?
Yes, GPT-5.1-Codex-Mini supports function calling (also called tool use). You can define custom functions that the model can invoke as part of its responses.
How does GPT-5.1-Codex-Mini compare to similar models?
GPT-5.1-Codex-Mini costs $0.2500 input and $2.00 output per 1M tokens. GPT-4.1 Mini is less expensive at $0.4000 input and $1.60 output per 1M tokens. See the "Compare with Similar Models" table above, or visit the GPT-4.1 Mini page at /tools/cost-calculator/openai/gpt-4-1-mini.