o3 Models by OpenAI
5 models2025Up to 200k ctxFrom $1/1M input
About
o3 is a family of 5 AI models by OpenAI, released in 2025.
Current Variants
Use-when guidance is derived from seed capabilities, context, release, and replacement fields.
3 in view2 retired
o3 Deep ResearchCurrent
Use when the workload needs 200k context, reasoning, and tool use.
2025-10200k contextreasoningtool use
o3-proCurrent
Use when the workload needs 200k context, reasoning, and tool use.
2025-06200k contextreasoningtool use
o3Current
Use when the workload needs 200k context, reasoning, and tool use.
2025-04200k contextreasoningtool use
| Model | Use when | Released | Signals | Status |
|---|---|---|---|---|
| o3 Deep Research | Use when the workload needs 200k context, reasoning, and tool use. | 2025-10 | 200k contextreasoningtool use | Current |
| o3-pro | Use when the workload needs 200k context, reasoning, and tool use. | 2025-06 | 200k contextreasoningtool use | Current |
| o3 | Use when the workload needs 200k context, reasoning, and tool use. | 2025-04 | 200k contextreasoningtool use | Current |
Release Timeline
4 release groups2025-10
1 current
o3 Deep Research
Current200k contextreasoningtool use
2025-06
1 current
o3-pro
Current200k contextreasoningtool use
2025-04
1 current · 1 retired
2025-01
1 retired
o3 Mini
Replaced200k contextreasoningtool use
Replaced By
Replaced
Keep for legacy integrations; evaluate GPT-5 Mini before new work.
Specifications(5 models)
| Model | Released | Context | Vision | Multimodal | Reasoning | Fn Calling | Tool Use | Structured Outputs | Code Exec |
|---|---|---|---|---|---|---|---|---|---|
| o3 Deep Research | 2025-10 | 200k | Yes | Yes | Yes | Yes | Yes | Yes | No |
| o3-pro | 2025-06 | 200k | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| o3 | 2025-04 | 200k | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
Available From(5 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 Deep Research | Vercel AI Gateway | $10 | $40 | Serverless |
| o3-pro | OpenRouter | $20 | $80 | Serverless |
| o3-pro | OpenAI API | $20 | $80 | Serverless |
| o3-pro | Vercel AI Gateway | $20 | $80 | Serverless |
Comparisons
- o3 vs Claude Opus 4.6
- o3 vs Claude Sonnet 4.6
- o3 Mini vs Claude 3.5 Haiku
- o4-mini vs Claude 3.5 Haiku
- o4-mini vs o3 Mini
- o3 vs Gemini 2.5 Pro
- o3 vs DeepSeek R1
- o3 vs Grok 4
Frequently Asked Questions
- What is o3 used for?
- o3 is used for vision and multimodal work, reasoning, and agent workflows and tool use. The family description and listed model capabilities point to those workloads as the best fit.
- How does o3 compare to GPT Realtime 2?
- o3 by OpenAI is strongest where you need vision and multimodal work, while GPT Realtime 2 by OpenAI is the closest related family to check for translation. o3 has 5 listed variants and reaches up to 200k context, while GPT Realtime 2 reaches up to 131k context, so compare the specs and pricing tables before choosing a production model.
