token.app › Compare › o3 Pro vs Grok 4.5
o3 Pro vs Grok 4.5
Grok 4.5 is 12× cheaper per token on a blended 3:1 basis. Grok 4.5 accepts the larger context window (500K).
Head to head
Blended price uses a 3:1 input:output mix
| o3 Pro | Grok 4.5 | |
|---|---|---|
| Provider | OpenAI | xAI |
| Input $/1M | $20.00 | $2.00 |
| Output $/1M | $80.00 | $6.00 |
| Blended $/1M | $35.00 | $3.00 |
| Context window | 200K | 500K |
| Max output | 100K | — |
| Released | Jun 2025 | Jul 2026 |
| Licence | Proprietary | Proprietary |
Choose o3 Pro if…
- No clear advantage on the data we hold.
Choose Grok 4.5 if…
- Costs less per token — $3.00 vs $35.00 blended
- Larger context window (500K)
- Newer model (released Jul 2026)
FAQ
Which is better, o3 Pro or Grok 4.5?
We do not hold independently-run benchmark scores covering both o3 Pro and Grok 4.5, so we make no quality claim. Their pricing and specifications are compared on this page.
Is o3 Pro cheaper than Grok 4.5?
Grok 4.5 is cheaper: $3.00 versus $35.00 per million tokens blended at 3:1 input:output. Input alone: $20.00 vs $2.00. Output alone: $80.00 vs $6.00.
What context windows do o3 Pro and Grok 4.5 have?
o3 Pro: 200,000 tokens. Grok 4.5: 500,000 tokens.
Who makes o3 Pro and Grok 4.5?
o3 Pro is made by OpenAI. Grok 4.5 is made by xAI.