Side-by-side comparison
Claude Opus 4 vs o3 Pro
Anthropic
Claude Opus 4
👁 Vision
🔧 Tools
Input / 1M
$15.0000
Output / 1M
$75.0000
| Claude Opus 4 | o3 Pro | |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Context window Maximum tokens (input + output) the model can process in a single request. Glossary → | 200,000 | 200,000 |
| Capabilities Optional capabilities the model advertises: vision (images), tools (function calling), json_mode (structured output). | vision, tools | vision, tools, json_mode |
| Input $ / 1M tokens Cost for tokens you send (prompt + context). Cheaper side highlighted. Glossary → | 15.0000 | 20.0000 |
| Output $ / 1M tokens Cost for tokens the model generates. Output is normally 3–5× pricier than input. Glossary → | 75.0000 | 80.0000 |
Frequently asked questions
Which is cheaper, Claude Opus 4 or o3 Pro?
Claude Opus 4 is cheaper than o3 Pro on a 50/50 input/output blend by about $5 per 1M tokens. Exact savings depend on your input-vs-output ratio — use the cost calculator on this page for a workload-specific estimate.
What is the difference between Claude Opus 4 and o3 Pro?
Claude Opus 4 comes from Anthropic; o3 Pro comes from OpenAI. They differ in pricing, context window, and supported capabilities — see the side-by-side table on this page for the exact figures, refreshed nightly.