o3 Models by OpenAI
OpenAIProprietary
OpenAI releases · 44 in the last 12 monthsChangelog →
4 models2025Up to 200K ctxFrom $1.10/1M input
Last refreshed 2026-10-17. Next refresh: weekly.
Capabilities
Vision3 of 4 models
Multimodal3 of 4 models
ReasoningAll models
JSON / Tool useAll models
Structured OutputsAll models
Code Execution3 of 4 models
Links
WebsiteAbout
o3 is OpenAI’s o-series reasoning model line, trained to spend more inference-time compute thinking before answering. OpenAI positions o3 for hard coding, math, science, and visual-analysis tasks, with agentic use of ChatGPT tools such as web search, Python, and image reasoning. The family includes o3 and o3-pro (a longer-thinking variant for Pro and API users).
Decision facts
Current Variants
Use-when guidance is based on each model's tracked capabilities, context window, release date, and replacement status.
2 in view2 retired
o3-proCurrent
Use when the workload needs 200K context, reasoning, and JSON / Tool use.
2025-06200K contextreasoningJSON / Tool use
o3Current
Use when the workload needs 200K context, reasoning, and JSON / Tool use.
2025-04200K contextreasoningJSON / Tool use
| Model | Use when | Released | Signals | Status |
|---|---|---|---|---|
| o3-pro | Use when the workload needs 200K context, reasoning, and JSON / Tool use. | 2025-06 | 200K contextreasoningJSON / Tool use | Current |
| o3 | Use when the workload needs 200K context, reasoning, and JSON / Tool use. | 2025-04 | 200K contextreasoningJSON / Tool use | Current |
Release Timeline
4 release groups2025-10
1 retired
o3 Deep Research
Archived200K contextreasoningJSON / Tool use
2025-06
1 current
o3-pro
Current200K contextreasoningJSON / Tool use
2025-04
1 current
o3
Current200K contextreasoningJSON / Tool use
2025-01
1 retired
o3 Mini
Replaced200K contextreasoningJSON / Tool use
Replaced By
Replaced
Keep for legacy integrations; evaluate GPT-6.1 Sol before new work.
Specifications(4 models)
Available From(4 providers)
Pricing
| Model | Provider | Input / 1M | Output / 1M | Type |
|---|---|---|---|---|
| o3 | OpenAI API | $2 | $8 | Serverless |
| o3 | OpenRouter | $2 | $8 | Serverless |
| o3 | Vercel AI Gateway | $2 | $8 | Serverless |
| o3-pro | OpenRouter | $20 | $80 | Serverless |
| o3-pro | OpenAI API | $20 | $80 | Serverless |
| o3-pro | Vercel AI Gateway | $20 | $80 | Serverless |
