OpenAI: o3 Pro API Pricing
OpenAI: o3 Pro costs $20.00 per 1M input tokens and $80.00 per 1M output tokens. Context window: 200K. Prices verified 2026-10-21 · source
Alternatives to consider
100% cheaper with nearly identical quality (20.1 vs 21.9)
Cheapest openai model — 100% less per month
Rebuilt daily from our snapshot archive — the chart appears once a model has 5+ snapshots of history.
From our own daily snapshot archive — independent of provider announcements.
Intelligence measures reasoning/knowledge/coding benchmarks. A high score with a low blended price = value pick; check the value chart to see where this model lands.
Token economics
| Token type | Price | vs base input |
|---|---|---|
| Standard input | $20.00 | — |
| Output | $80.00 | — |
| Web search tool | $10/1k searches | — |
Prompt caching stores repeated context server-side: reads cost far less, but writes carry a one-time premium.
Higher effort = deeper thinking = more reasoning tokens billed as output.
Training data ends here — newer events require retrieval or web search.
What would OpenAI: o3 Pro cost you per month?
| Workload | Requests/mo | Avg tokens (in/out) | Est. monthly cost |
|---|---|---|---|
| Light chatbot | 10,000 | 800 / 400 | $480.00 |
| Coding agent | 5,000 | 8,000 / 2,000 | $1600.00 |
| RAG pipeline | 30,000 | 4,000 / 500 | $3600.00 |
| Doc summarizer | 2,000 | 20,000 / 1,000 | $960.00 |
Estimates use list prices without prompt caching. Caching can cut input cost by up to 90% on repeated context.
About OpenAI: o3 Pro
The o-series of models are trained with reinforcement learning to think before they answer and perform complex reasoning. The o3-pro model uses more compute to think harder and provide consistently...
Compare OpenAI: o3 Pro with
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Popular head-to-heads — see all on the comparisons index.
Frequently asked questions
How much does OpenAI: o3 Pro cost?
OpenAI: o3 Pro costs $20.00 per 1M input tokens and $80.00 per 1M output tokens. Verified 2026-10-21 — provider source.
What is the context window?
200K tokens, with up to 100K output tokens per response. That's roughly 250 pages of text in a single request.
Does it support prompt caching?
Prompt-caching pricing is not published for this model via OpenRouter.
What's a cheaper alternative?
ScaleDown: Summarize saves about 99% on a typical workload with comparable quality.
Official resources
- OpenAI: o3 Pro on OpenRouter — live endpoint, pricing source of record.
- Artificial Analysis leaderboard → — independent intelligence and performance rankings.
- OpenAI pricing → — first-party pricing and billing details.
- LMArena leaderboard → — independent human-preference rankings.
- Shred your current bill — paste a CSV and see if switching saves money.