o1 API Pricing
OpenAI · context window 200K · prices updated 2026-09-15
Where o1 sits on price
At $60.00 per million output tokens, o1 is a frontier tier model — 28.8× the median output price of $2.08, which puts it in the most expensive 10% of everything we track. It sits 82th cheapest of the 92 OpenAI models we track. Output costs 4.0× input, the usual spread — trim both, starting with the answer length.
Cached input is 50% cheaper. On an input-heavy workload you need roughly a 50% cache-hit rate to take 25% off the input line — reachable for chatbots and agents that resend the same system prompt and history.
What real workloads cost on o1
These three workloads are the ones teams actually run on a frontier-priced model — a $60.00/1M model is not bought for the same job as one ten times the price.
| Workload | Per request | Per month |
|---|---|---|
| Small app — 1K requests/day (500 in / 150 out) The baseline most side projects actually run at. | $0.0165 | $495 |
| Coding agent — 300 sessions/day (60K in / 12K out) Multi-step loops re-read the same files; caching matters more than raw price. | $1.62 | $14580 |
| Support chatbot — 500 conversations/day (5K in / 1.4K out) Conversation history re-sent each turn — the classic prompt-caching win. | $0.159 | $2385 |
Model your exact traffic in the API cost calculator — it preloads o1 with caching and batch options.
o1 price history
o1's price has not moved since we began tracking it on Aug 2, 2026 — 44 days of stability in a market where 78 of the 334 models we track have repriced over the same period, including 9 of OpenAI's own 92 models.
Change-points from our daily price snapshots (tracking since Aug 2, 2026; intraday moves between snapshots are not captured).
o1 vs Claude Fable 5.1
The closest-priced alternative from another vendor is Claude Fable 5.1 (Anthropic) — 17% cheaper on output, with $5.00 less per million input tokens. When two models land this close on price, the decision is quality on your own workload, not the price sheet: run 50 real requests through both and compare.
See Claude Fable 5.1 pricing →Cheaper alternatives
More OpenAI models
Frequently asked questions
› How much does the o1 API cost?
o1 costs $15.00 per million input tokens and $60.00 per million output tokens, with cached input at $7.50 per million (50% cheaper). That works out to roughly 16,667 output tokens per dollar.
› What does the small app workload cost on o1?
Small app — 1K requests/day (500 in / 150 out) costs about $0.0165 per request and $495 per month on o1. The baseline most side projects actually run at.
› What does it cost to fill o1's 200K context window?
Sending 200K of input in a single request costs $3.00 at $15.00 per million tokens — before any output. With prompt caching that same fill drops to about $1.50 on repeat requests. This is why large context windows are cheap to advertise and expensive to actually use.
› Is o1 worth the price?
o1 is priced in the top bracket, at $60.00 per million output tokens. It only pays off where an error is expensive — production code, legal and medical drafting, agents that take real actions. For anything routine, Claude Fable 5.1 at $50.00 does the same job for a fraction of the bill.