token.app › Compare › Claude Sonnet 5.5 vs Mercury 3
Claude Sonnet 5.5 vs Mercury 3
Mercury 3 is 25× cheaper per token on a blended 3:1 basis.
Head to head
Blended price uses a 3:1 input:output mix
| Claude Sonnet 5.5 | Mercury 3 | |
|---|---|---|
| Provider | Anthropic | Inception |
| Input $/1M | $2.00 | $0.100 |
| Output $/1M | $10.00 | $0.350 |
| Blended $/1M | $4.00 | $0.163 |
| Context window | 1M | 1M |
| Max output | 128K | 131K |
| Released | Sep 2026 | Oct 2026 |
| Licence | Proprietary | Proprietary |
Choose Claude Sonnet 5.5 if…
- No clear advantage on the data we hold.
Choose Mercury 3 if…
- Costs less per token — $0.163 vs $4.00 blended
- Newer model (released Oct 2026)
FAQ
Which is better, Claude Sonnet 5.5 or Mercury 3?
We do not hold independently-run benchmark scores covering both Claude Sonnet 5.5 and Mercury 3, so we make no quality claim. Their pricing and specifications are compared on this page.
Is Claude Sonnet 5.5 cheaper than Mercury 3?
Mercury 3 is cheaper: $0.163 versus $4.00 per million tokens blended at 3:1 input:output. Input alone: $2.00 vs $0.100. Output alone: $10.00 vs $0.350.
What context windows do Claude Sonnet 5.5 and Mercury 3 have?
Claude Sonnet 5.5: 1,000,000 tokens. Mercury 3: 1,000,000 tokens.
Who makes Claude Sonnet 5.5 and Mercury 3?
Claude Sonnet 5.5 is made by Anthropic. Mercury 3 is made by Inception.
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