Model: OpenAI: GPT-5.1-Codex, Context: 400000, Cost: $1.25 per 1M input tokens, $10 per 1M output tokens
Note: Calculation is approximate based on public data. Prices may change, check official websites.
This calculator estimates the API token costs for the OpenAI: GPT-5.1-Codex model, a specialized version of GPT-5.1 optimized for software engineering and coding workflows.
The GPT-5.1-Codex model offers a large context window of 400,000 tokens, enabling it to handle complex engineering tasks, from building projects from scratch to large-scale refactoring and code review. It's known for producing cleaner, higher-quality code outputs and adhering closely to developer instructions, making it ideal for agentic coding applications.
The pricing structure is as follows:
- Input tokens: $1.25 per 1 million tokens
- Output tokens: $10.00 per 1 million tokens
The total cost is calculated using the formula:
Total Cost = (Input Tokens / 1,000,000) * $1.25 + (Output Tokens / 1,000,000) * $10.00
Example:
If you use 500,000 input tokens and 200,000 output tokens for one request:
- Input Cost = (500,000 / 1,000,000) * $1.25 = $0.625
- Output Cost = (200,000 / 1,000,000) * $10.00 = $2.00
- Total Cost = $0.625 + $2.00 = $2.625