Model Watch · OpenAI
The o-series is being wound down. o3 and o3-pro go on 11 December 2026, o3-mini and o4-mini on 23 October.
o3 is a model from OpenAI, built in the US. The lab has put it on the retirement list. Move off it.
OpenAI released it on 16 April 2025. That date comes from the lab's own docs.
The tracker first logged the name on 4 September 2026 and last saw it on 4 September 2026.
| Lab | OpenAI |
|---|---|
| Built in | US |
| Status | deprecated |
| API model id | o3 |
| Released | 16 April 2025 |
| Context window | 200K tokens |
| Max output | 100K tokens |
| Input, per 1M tokens | $2.00 |
| Output, per 1M tokens | $8.00 |
List prices per million tokens, read off the lab's own docs. Caching, batching and volume deals all cut the real number, so treat this as the ceiling. Check the source before you budget against it.
At 700 words in and 500 out, twenty times a day, that works out around $4.32 a month. Put your own numbers in, see every OpenAI price, or put it next to another model.
| Model | Status | Date | Context | In / 1M | Out / 1M |
|---|---|---|---|---|---|
| o3 | deprecated | 16 April 2025 | 200K tokens | $2.00 | $8.00 |
| GPT-6 Astra | released | 3 September 2026 | 1050K tokens | $10.00 | $50.00 |
| GPT-5.6 Terra | released | 9 July 2026 | 1050K tokens | $2.00 | $12.00 |
| GPT-5.6 Sol | released | 9 July 2026 | 1050K tokens | $4.00 | $20.00 |
| GPT-5.6 Luna | released | 9 July 2026 | 1050K tokens | $0.20 | $1.20 |
| GPT-5.5 | released | 23 April 2026 | 1050K tokens | $5.00 | $30.00 |
| GPT-5.4 nano | released | 17 March 2026 | 400K tokens | $0.20 | $1.25 |
| GPT-5.4 Mini | released | 17 March 2026 | 400K tokens | $0.75 | $4.50 |
| GPT-5.4 | released | 5 March 2026 | 1050K tokens | $2.50 | $15.00 |
| GPT-5.3-Codex | released | 5 February 2026 | 400K tokens | $1.75 | $14.00 |
| GPT-5.2 | released | 11 December 2025 | 400K tokens | $1.75 | $14.00 |
| GPT-5.1 | released | 13 November 2025 | 400K tokens | $1.25 | $10.00 |
| GPT-5 | deprecated | 7 August 2025 | 400K tokens | $1.25 | $10.00 |
| GPT-5.5 Pro | released | — | 1050K tokens | $30.00 | $180.00 |
A dash means the lab hasn't published that number for that model.
Every tracked post, release, changelog entry or incident whose title or summary names o3. Newest first, each one linking to where the lab published it.
Now tracking this page; changes will appear here as they happen. Latest announcements: 2026-08-26: Transcription models; 2026-07-20: Legacy audio, realtime, and transcription models; 2026-06-11: GPT-5 and o3 model deprecations; 2026-06-03: Reusable prompts; 2026-06-03: Evals platform; 2026-06-03: Agent Builder
The release timeline is every model we know about, filterable by lab, country and date. The tracker is the live feed these mentions come from, and Model Watch is the whole catalogue on one page.
More from OpenAI:
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