AI model comparison
Claude Opus 4.1 vs o3 Pro
Pricing, context window, benchmarks, and features compared side by side. Or skip the guesswork and send one prompt to both.
Anthropic
Claude Opus 4.1
Claude Opus 4.1 is an updated version of Anthropic’s flagship model, offering improved performance in coding, reasoning, and agentic tasks.
- Input / 1M
- $15
- Output / 1M
- $75
- Context
- 200K
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
At a glance
Quick verdict
How the two models stack up on the things people ask about most.
Lower price
Claude Opus 4.1
1.2x cheaper for a typical chat
Higher intelligence score
Claude Opus 4.1
22.8 vs 21.9 on Artificial Analysis
Larger context window
Tie
200K vs 200K tokens
Newer release
Claude Opus 4.1
Released August 5, 2025
Benchmarks
Benchmark scores
Independent scores from Artificial Analysis. Higher is better.
Intelligence index
Claude Opus 4.122.8o3 Pro21.9Coding index
Claude Opus 4.1Not availableo3 ProNot availableAgentic index
Claude Opus 4.1Not availableo3 ProNot availablePricing
Claude Opus 4.1 vs o3 Pro API pricing
Per-token API rates. Cheaper option highlighted.
| Metric | Claude Opus 4.1 | o3 Pro |
|---|---|---|
| Input tokensPer 1M tokens | $15 | $20 |
| Output tokensPer 1M tokens | $75 | $80 |
| Cached input (read)Per 1M tokens | $1.50 | Not available |
| Cache writePer 1M tokens | $18.75 | 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
Claude Opus 4.1$67.50o3 Pro$80Coding task
30K in, 4K out
Claude Opus 4.1$750$345 cachedo3 Pro$920Long document summary
150K in, 2K out
Claude Opus 4.1$2400$375 cachedo3 Pro$3160Specs
Context window and capabilities
How much each model can read, how much it can write, and what it accepts as input.
| Metric | Claude Opus 4.1 | o3 Pro |
|---|---|---|
| Context window | 200K tokens | 200K tokens |
| Max output | 32K 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 | August 5, 2025 | June 10, 2025 |
Features
Supported features
API features available for each model.
| Metric | Claude Opus 4.1 | o3 Pro |
|---|---|---|
| Tool calling | Supported | Supported |
| Structured outputs | Not supported | Supported |
| JSON mode | Not supported | Supported |
| Reasoning | Supported | Supported |
| Temperature | Supported | Not supported |
| Stop sequences | Supported | Not supported |
| Deterministic seed | Not 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
Claude Opus 4.1 is 1.2x cheaper for a typical chat. Claude Opus 4.1 scores higher on the Artificial Analysis Intelligence Index (22.8 vs 21.9). 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 Claude Opus 4.1 or o3 Pro cheaper?
Claude Opus 4.1 is cheaper for a typical chat (2K input tokens and 500 output tokens). Claude Opus 4.1 costs $15 per 1M input tokens and $75 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, Claude Opus 4.1 or o3 Pro?
Claude Opus 4.1 supports up to 200K tokens of context, compared with 200K for o3 Pro.
Is Claude Opus 4.1 smarter than o3 Pro?
On the Artificial Analysis Intelligence Index, Claude Opus 4.1 scores 22.8 and o3 Pro scores 21.9, putting Claude Opus 4.1 ahead. Benchmarks don't capture everything, so the best test is running your own prompts through both.
Can I use Claude Opus 4.1 and o3 Pro at the same time?
Yes. Shortcut Chat sends one prompt to multiple models at once, so you can see Claude Opus 4.1 and o3 Pro answer side by side and keep the better response.
Why choose? Ask both.
Send one prompt to Claude Opus 4.1 and o3 Pro at the same time. Compare the answers side by side and keep the best one.