OpenAIreasoningGPT-5.1-Codex-Mini pricing
$0.25 per 1M input tokens and $2.00 per 1M output tokens. In real work that is 0.13¢ per chat answer and 0.43¢ to summarize a 20-page PDF.
What GPT-5.1-Codex-Mini costs per task
Token counts estimated from a measured model of the same lab (GPT-6.1 Sol), rescaled by tokenizer. Reasoning tokens are billed as output.
| Task | Cost | Tokens used | Price rank | Basis |
|---|---|---|---|---|
| Answer a chat question | 0.13¢$1.34 / 1,000 | 45 in · 560 out · 103 reasoning | 128 of 336 | estimated |
| Reply to a customer email | 0.03¢$0.32 / 1,000 | 258 in · 126 out | 82 of 336 | estimated |
| Write a 1,500-word blog post | 0.46¢$4.59 / 1,000 | 59 in · 2,116 out · 172 reasoning | 120 of 336 | estimated |
| Write 10 product descriptions | 0.24¢$2.42 / 1,000 | 283 in · 1,103 out · 72 reasoning | 89 of 336 | estimated |
| Translate 1,000 words | 0.30¢$3.00 / 1,000 | 1,330 in · 1,289 out · 44 reasoning | 122 of 336 | estimated |
| Proofread one page (500 words) | 0.15¢$1.50 / 1,000 | 718 in · 662 out | 123 of 336 | estimated |
| Summarize a 20-page PDF | 0.43¢$4.26 / 1,000 | 12,987 in · 482 out · 26 reasoning | 114 of 336 | estimated |
| Extract data from an invoice | 0.10¢$0.99 / 1,000 | 373 in · 450 out | 98 of 336 | estimated |
| Analyze a 200-row spreadsheet | 1.6¢$16.14 / 1,000 | 4,779 in · 919 out · 6,553 reasoning | 141 of 336 | estimated |
| Answer from 5 retrieved documents (RAG) | 0.18¢$1.81 / 1,000 | 3,690 in · 442 out | 90 of 336 | estimated |
| Classify 100 support tickets | 0.14¢$1.35 / 1,000 | 1,261 in · 442 out · 77 reasoning | 46 of 336 | estimated |
| Review 500 lines of code | 0.91¢$9.10 / 1,000 | 4,557 in · 1,135 out · 2,843 reasoning | 142 of 336 | estimated |
| Write a SQL query | 0.09¢$0.95 / 1,000 | 126 in · 312 out · 147 reasoning | 100 of 336 | estimated |
| Run a 50-step coding agent | 12¢$115 / 1,000 | 2,237,500 in · 15,000 out | 64 of 336 | modeled |
Price at every provider
List prices per 1M tokens (input / output) at each host serving GPT-5.1-Codex-Mini through OpenRouter today. Hosts can differ in quantization, context and speed.
| Provider | Input / output | Cached input | Context | Uptime |
|---|---|---|---|---|
 Azureunknown | $0.25 / $2.00 | $0.03 | 400K |
Price history
First seen in our price history on Nov 14, 2025 at $0.25 input / $2.00 output. The list price has not changed since.
FAQ
How much does GPT-5.1-Codex-Mini cost?
GPT-5.1-Codex-Mini costs $0.25 per 1 million input tokens and $2.00 per 1 million output tokens, with cached input at $0.03 (list price on Oct 18, 2026). In practice one chat answer costs about 0.13¢ and summarizing a 20-page PDF about 0.43¢.
Where is GPT-5.1-Codex-Mini cheapest?
Among 1 providers we track, the lowest list price today is at Azure: $0.25 input and $2.00 output per 1M tokens.
Does GPT-5.1-Codex-Mini charge for reasoning tokens?
Yes. Reasoning (thinking) tokens are billed as output tokens. That is why the cost per task can be much higher than the visible answer suggests - our task costs include them.
Is the GPT-5.1-Codex-Mini cost per task measured or estimated?
Estimated: GPT-5.1-Codex-Mini was not run directly. Tokens come from GPT-6.1 Sol and are rescaled by the tokenizer of OpenAI. Real usage can differ.