token.app › Compare › DeepSeek V3.1 Terminus vs Mercury 3

DeepSeek V3.1 Terminus vs Mercury 3

Mercury 3 is 2.8× cheaper per token on a blended 3:1 basis. Mercury 3 accepts the larger context window (1M).

Head to head
Blended price uses a 3:1 input:output mix
DeepSeek V3.1 TerminusMercury 3
ProviderDeepSeekInception
Input $/1M$0.270$0.100
Output $/1M$1.00$0.350
Blended $/1M$0.453$0.163
Context window164K1M
Max output147K131K
ReleasedSep 2025Oct 2026
LicenceOpen weightsProprietary
Choose DeepSeek V3.1 Terminus if…
  • Open weights — self-hostable
Choose Mercury 3 if…
  • Costs less per token — $0.163 vs $0.453 blended
  • Larger context window (1M)
  • Newer model (released Oct 2026)
FAQ
Which is better, DeepSeek V3.1 Terminus or Mercury 3?
We do not hold independently-run benchmark scores covering both DeepSeek V3.1 Terminus and Mercury 3, so we make no quality claim. Their pricing and specifications are compared on this page.
Is DeepSeek V3.1 Terminus cheaper than Mercury 3?
Mercury 3 is cheaper: $0.163 versus $0.453 per million tokens blended at 3:1 input:output. Input alone: $0.270 vs $0.100. Output alone: $1.00 vs $0.350.
What context windows do DeepSeek V3.1 Terminus and Mercury 3 have?
DeepSeek V3.1 Terminus: 163,840 tokens. Mercury 3: 1,000,000 tokens.
Who makes DeepSeek V3.1 Terminus and Mercury 3?
DeepSeek V3.1 Terminus is made by DeepSeek. Mercury 3 is made by Inception.
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