OpenAI retires o1-pro-2025-03-19 on Oct 23, 2026: replacement and cost
- Date
- Oct 23, 2026
- Model
o1-pro-2025-03-19- Named replacement
gpt-5.6-sol- Maker
- OpenAI
Replacement note: reasoning.mode: pro.
OpenAI's deprecation table lists the alias o1-pro on this row. If you call o1-pro, check which snapshot it points to.
Price before and after
| Per 1M tokens | Before (o1-pro-2025-03-19) | After (gpt-5.6-sol) |
|---|---|---|
| Input | $150.00 | $4.00 |
| Output | $600.00 | $20.00 |
| Cached input | not published | $0.40 |
| Blended (3 in : 1 out) | $262.50 | $8.00 (−97%) |
List prices, USD. Blended = (3 × input + 1 × output) ÷ 4 — a stated reference mix, not your workload. Prices: developers.openai.com, checked Sep 29, 2026.
Before price is the o1-pro row on OpenAI's pricing page; OpenAI's o1-pro model page lists o1-pro-2025-03-19 as its snapshot. OpenAI's pricing page lists one per-token rate for gpt-5.6-sol and no separate rate for reasoning.mode: pro; pro mode can generate many more reasoning (output) tokens. The replacement price is GPT-5.6 Sol's promotional rate, which OpenAI says is available at least through November 21, 2026. OpenAI does not publish the rate after the promotion, so the forecast keeps the promotional rate; your cost may be higher once it ends.
Source
“October 23, 2026 o1-pro-2025-03-19 | o1-pro gpt-5.6-sol ( reasoning.mode: pro )”
https://developers.openai.com/api/docs/deprecations · checked Sep 29, 2026
Same model on other routes
- Azure (Microsoft Foundry):
o1-pro (version 2025-03-19)— shutdown Nov 19, 2026, replacementgpt-5.6-sol
What it does to your bill
Prefilled with o1-pro-2025-03-19. Change the tokens, or add the other models you use.
Example workload — replace with yours.
From announced changes alone, this workload goes from $19,394/mo in Oct 2026 to $800/mo in Mar 2027 (−95.9%).
Heads-up: GPT-5.6 Sol: promotional price, available at least through Nov 21, 2026. The forecast keeps today's rate because the later rate is not published.
Month-by-month table
| Month | Cost |
|---|---|
| Oct 2026 | $19,393.55 |
| Nov 2026 | $800.00 |
| Dec 2026 | $800.00 |
| Jan 2027 | $800.00 |
| Feb 2027 | $800.00 |
| Mar 2027 | $800.00 |
| # | Date | Change | $/mo change | Source |
|---|---|---|---|---|
| 1 | Oct 23, 2026 | o1-pro-2025-03-19 → gpt-5.6-sol (reasoning.mode: pro) | −$26,200.00 | developers.openai.com |
The replacement is the provider's named replacement, not our recommendation; quality and behavior can differ.
This link contains the numbers you entered.
Methodology and limits
Prices are list prices in USD per 1M tokens from the provider's pricing page; dates and named replacements come from the provider's deprecation page, quoted above with the date we last checked. The replacement is the provider's named replacement, not our recommendation — quality and behavior can differ. Discounts, committed-use or enterprise agreements, batch and regional pricing, and Azure OpenAI and Amazon Bedrock prices are not included. Dates marked "at least through" or "not before" are shown but never applied.Full methodology →