AI model comparison
o3 Pro vs o3
Pricing, context window, benchmarks, and features compared side by side. Or skip the guesswork and send one prompt to both.
OpenAI
o3 Pro
The o-series of models are trained with reinforcement learning to think before they answer and perform complex reasoning.
- Input / 1M
- $20
- Output / 1M
- $80
- Context
- 200K
OpenAI
o3
o3 is a well-rounded and powerful model across domains. It sets a new standard for math, science, coding, and visual reasoning tasks.
- Input / 1M
- $2
- Output / 1M
- $8
- Context
- 200K
At a glance
Quick verdict
How the two models stack up on the things people ask about most.
Lower price
o3
10x cheaper for a typical chat
Higher intelligence score
o3 Pro
21.9 vs 20.2 on Artificial Analysis
Larger context window
Tie
200K vs 200K tokens
Newer release
o3 Pro
Released June 10, 2025
Benchmarks
Benchmark scores
Independent scores from Artificial Analysis. Higher is better.
Intelligence index
o3 Pro21.9o320.2Coding index
o3 ProNot availableo3Not availableAgentic index
o3 ProNot availableo3Not availablePricing
o3 Pro vs o3 API pricing
Per-token API rates. Cheaper option highlighted.
| Metric | o3 Pro | o3 |
|---|---|---|
| Input tokensPer 1M tokens | $20 | $2 |
| Output tokensPer 1M tokens | $80 | $8 |
| Cached input (read)Per 1M tokens | Not available | $0.50 |
| Cache writePer 1M tokens | Not available | Not available |
| Web searchPer request | $0.01 | $0.01 |
What it costs in practice
Estimated cost per 1,000 requests at standard rates. Coding and long-document figures also show the cost when the input is already cached.
Chat message
2K in, 500 out
o3 Pro$80o3$8Coding task
30K in, 4K out
o3 Pro$920o3$92$47 cachedLong document summary
150K in, 2K out
o3 Pro$3160o3$316$91 cachedSpecs
Context window and capabilities
How much each model can read, how much it can write, and what it accepts as input.
| Metric | o3 Pro | o3 |
|---|---|---|
| Context window | 200K tokens | 200K tokens |
| Max output | 100K tokens | 100K tokens |
| Input types | File, Image, Text | File, Image, Text |
| Output types | Text | Text |
| Reasoning effort levels | Not available | Not available |
| Default reasoning effort | Not available | Not available |
| Release date | June 10, 2025 | April 16, 2025 |
Features
Supported features
API features available for each model.
| Metric | o3 Pro | o3 |
|---|---|---|
| Tool calling | Supported | Supported |
| Structured outputs | Supported | Supported |
| JSON mode | Supported | Supported |
| Reasoning | Supported | Supported |
| Temperature | Not supported | Not supported |
| Stop sequences | Not supported | Not supported |
| Deterministic seed | Supported | Supported |
| Verbosity control | Not supported | Not supported |
Keep exploring
More on these models
Other head-to-heads, the full model page, and the alternatives list for each model.
Our take
o3 is 10x cheaper for a typical chat. o3 Pro scores higher on the Artificial Analysis Intelligence Index (21.9 vs 20.2). The right pick depends on your workload, so the quickest way to settle it is to send the same prompt to both and compare.
FAQ
Frequently asked questions
Is o3 Pro or o3 cheaper?
o3 is cheaper for a typical chat (2K input tokens and 500 output tokens). o3 costs $2 per 1M input tokens and $8 per 1M output tokens, while o3 Pro costs $20 per 1M input tokens and $80 per 1M output tokens.
Which has a bigger context window, o3 Pro or o3?
o3 Pro supports up to 200K tokens of context, compared with 200K for o3.
Is o3 Pro smarter than o3?
On the Artificial Analysis Intelligence Index, o3 Pro scores 21.9 and o3 scores 20.2, putting o3 Pro ahead. Benchmarks don't capture everything, so the best test is running your own prompts through both.
Can I use o3 Pro and o3 at the same time?
Yes. Shortcut Chat sends one prompt to multiple models at once, so you can see o3 Pro and o3 answer side by side and keep the better response.
Why choose? Ask both.
Send one prompt to o3 Pro and o3 at the same time. Compare the answers side by side and keep the best one.