token.app › Compare › o3 Pro vs Claude Sonnet 5
o3 Pro vs Claude Sonnet 5
Claude Sonnet 5 is 8.8× cheaper per token on a blended 3:1 basis. Claude Sonnet 5 accepts the larger context window (1M).
Head to head
Blended price uses a 3:1 input:output mix
| o3 Pro | Claude Sonnet 5 | |
|---|---|---|
| Provider | OpenAI | Anthropic |
| Input $/1M | $20.00 | $2.00 |
| Output $/1M | $80.00 | $10.00 |
| Blended $/1M | $35.00 | $4.00 |
| Context window | 200K | 1M |
| Max output | 100K | 128K |
| Released | Jun 2025 | Jun 2026 |
| Licence | Proprietary | Proprietary |
Choose o3 Pro if…
- No clear advantage on the data we hold.
Choose Claude Sonnet 5 if…
- Costs less per token — $4.00 vs $35.00 blended
- Larger context window (1M)
- Newer model (released Jun 2026)
FAQ
Which is better, o3 Pro or Claude Sonnet 5?
We do not hold independently-run benchmark scores covering both o3 Pro and Claude Sonnet 5, so we make no quality claim. Their pricing and specifications are compared on this page.
Is o3 Pro cheaper than Claude Sonnet 5?
Claude Sonnet 5 is cheaper: $4.00 versus $35.00 per million tokens blended at 3:1 input:output. Input alone: $20.00 vs $2.00. Output alone: $80.00 vs $10.00.
What context windows do o3 Pro and Claude Sonnet 5 have?
o3 Pro: 200,000 tokens. Claude Sonnet 5: 1,000,000 tokens.
Who makes o3 Pro and Claude Sonnet 5?
o3 Pro is made by OpenAI. Claude Sonnet 5 is made by Anthropic.