Side-by-side comparison
o3 Pro vs Grok 4
| o3 Pro | Grok 4 | |
|---|---|---|
| Provider | OpenAI | xAI |
| Context window Maximum tokens (input + output) the model can process in a single request. Glossary → | 200,000 | 256,000 |
| Capabilities Optional capabilities the model advertises: vision (images), tools (function calling), json_mode (structured output). | vision, tools, json_mode | vision, tools, json_mode |
| Input $ / 1M tokens Cost for tokens you send (prompt + context). Cheaper side highlighted. Glossary → | 20.0000 | 3.0000 |
| Output $ / 1M tokens Cost for tokens the model generates. Output is normally 3–5× pricier than input. Glossary → | 80.0000 | 15.0000 |
Frequently asked questions
Which is cheaper, o3 Pro or Grok 4?
Grok 4 is cheaper than o3 Pro on a 50/50 input/output blend by about $41 per 1M tokens. Exact savings depend on your input-vs-output ratio — use the cost calculator on this page for a workload-specific estimate.
Which has a larger context window, o3 Pro or Grok 4?
Grok 4 has the larger context window at 256k tokens versus 200k tokens for o3 Pro. That means Grok 4 can ingest about 1.3x as much text per request.
What is the difference between o3 Pro and Grok 4?
o3 Pro comes from OpenAI; Grok 4 comes from xAI. They differ in pricing, context window, and supported capabilities — see the side-by-side table on this page for the exact figures, refreshed nightly.