token.app › Compare › Claude Fable 5.1 vs Mercury 3
Claude Fable 5.1 vs Mercury 3
Mercury 3 is 123× cheaper per token on a blended 3:1 basis.
Head to head
Blended price uses a 3:1 input:output mix
| Claude Fable 5.1 | Mercury 3 | |
|---|---|---|
| Provider | Anthropic | Inception |
| Input $/1M | $10.00 | $0.100 |
| Output $/1M | $50.00 | $0.350 |
| Blended $/1M | $20.00 | $0.163 |
| Context window | 1M | 1M |
| Max output | 128K | 131K |
| Released | Sep 2026 | Oct 2026 |
| Licence | Proprietary | Proprietary |
Choose Claude Fable 5.1 if…
- No clear advantage on the data we hold.
Choose Mercury 3 if…
- Costs less per token — $0.163 vs $20.00 blended
- Newer model (released Oct 2026)
FAQ
Which is better, Claude Fable 5.1 or Mercury 3?
We do not hold independently-run benchmark scores covering both Claude Fable 5.1 and Mercury 3, so we make no quality claim. Their pricing and specifications are compared on this page.
Is Claude Fable 5.1 cheaper than Mercury 3?
Mercury 3 is cheaper: $0.163 versus $20.00 per million tokens blended at 3:1 input:output. Input alone: $10.00 vs $0.100. Output alone: $50.00 vs $0.350.
What context windows do Claude Fable 5.1 and Mercury 3 have?
Claude Fable 5.1: 1,000,000 tokens. Mercury 3: 1,000,000 tokens.
Who makes Claude Fable 5.1 and Mercury 3?
Claude Fable 5.1 is made by Anthropic. Mercury 3 is made by Inception.
Related comparisons