OpenAIreasoningo3 pricing
$2.00 per 1M input tokens and $8.00 per 1M output tokens. In real work that is 0.54¢ per chat answer and 3.0¢ to summarize a 20-page PDF.
What o3 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 | 0.54¢$5.39 / 1,000 | 45 in · 560 out · 103 reasoning | 227 of 336 | estimated |
| Reply to a customer email | 0.15¢$1.52 / 1,000 | 258 in · 126 out | 203 of 336 | estimated |
| Write a 1,500-word blog post | 1.8¢$18.42 / 1,000 | 59 in · 2,116 out · 172 reasoning | 232 of 336 | estimated |
| Write 10 product descriptions | 1.00¢$9.97 / 1,000 | 283 in · 1,103 out · 72 reasoning | 208 of 336 | estimated |
| Translate 1,000 words | 1.3¢$13.32 / 1,000 | 1,330 in · 1,289 out · 44 reasoning | 202 of 336 | estimated |
| Proofread one page (500 words) | 0.67¢$6.73 / 1,000 | 718 in · 662 out | 238 of 336 | estimated |
| Summarize a 20-page PDF | 3.0¢$30.04 / 1,000 | 12,987 in · 482 out · 26 reasoning | 258 of 336 | estimated |
| Extract data from an invoice | 0.43¢$4.35 / 1,000 | 373 in · 450 out | 212 of 336 | estimated |
| Analyze a 200-row spreadsheet | 6.9¢$69.33 / 1,000 | 4,779 in · 919 out · 6,553 reasoning | 256 of 336 | estimated |
| Answer from 5 retrieved documents (RAG) | 1.1¢$10.92 / 1,000 | 3,690 in · 442 out | 242 of 336 | estimated |
| Classify 100 support tickets | 0.67¢$6.67 / 1,000 | 1,261 in · 442 out · 77 reasoning | 164 of 336 | estimated |
| Review 500 lines of code | 4.1¢$40.94 / 1,000 | 4,557 in · 1,135 out · 2,843 reasoning | 241 of 336 | estimated |
| Write a SQL query | 0.39¢$3.92 / 1,000 | 126 in · 312 out · 147 reasoning | 201 of 336 | estimated |
| Run a 50-step coding agent | $1.36$1,361 / 1,000 | 2,237,500 in · 15,000 out | 254 of 336 | modeled |
Price at every provider
List prices per 1M tokens (input / output) at each host serving o3 through OpenRouter today. Hosts can differ in quantization, context and speed.
| Provider | Input / output | Cached input | Context | Uptime |
|---|---|---|---|---|
OpenAIunknown | $2.00 / $8.00 | $0.50 | 200K | 100% |
Price history
First seen in our price history on Apr 23, 2025 at $10.00 input / $40.00 output. Since then the output price moved from $40.00 to $8.00 per 1M tokens (1 change).
FAQ
How much does o3 cost?
o3 costs $2.00 per 1 million input tokens and $8.00 per 1 million output tokens, with cached input at $0.50 (list price on Oct 18, 2026). In practice one chat answer costs about 0.54¢ and summarizing a 20-page PDF about 3.0¢.
Where is o3 cheapest?
Among 1 providers we track, the lowest list price today is at OpenAI: $2.00 input and $8.00 output per 1M tokens.
Does o3 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 o3 cost per task measured or estimated?
Estimated: o3 was not run directly. Tokens come from GPT-6.1 Sol and are rescaled by the tokenizer of OpenAI. Real usage can differ.