token.app › Compare › DeepSeek V3.1 Terminus vs DeepSeek V4.1 Flash 1017

DeepSeek V3.1 Terminus vs DeepSeek V4.1 Flash 1017

DeepSeek V4.1 Flash 1017 is 1.7× cheaper per token on a blended 3:1 basis. DeepSeek V4.1 Flash 1017 accepts the larger context window (1.0M).

Head to head
Blended price uses a 3:1 input:output mix
DeepSeek V3.1 TerminusDeepSeek V4.1 Flash 1017
ProviderDeepSeekDeepSeek
Input $/1M$0.270$0.150
Output $/1M$1.00$0.600
Blended $/1M$0.453$0.262
Context window164K1.0M
Max output147K393K
ReleasedSep 2025Oct 2026
LicenceOpen weightsOpen weights
Choose DeepSeek V3.1 Terminus if…
  • No clear advantage on the data we hold.
Choose DeepSeek V4.1 Flash 1017 if…
  • Costs less per token — $0.262 vs $0.453 blended
  • Larger context window (1.0M)
  • Newer model (released Oct 2026)
FAQ
Which is better, DeepSeek V3.1 Terminus or DeepSeek V4.1 Flash 1017?
We do not hold independently-run benchmark scores covering both DeepSeek V3.1 Terminus and DeepSeek V4.1 Flash 1017, so we make no quality claim. Their pricing and specifications are compared on this page.
Is DeepSeek V3.1 Terminus cheaper than DeepSeek V4.1 Flash 1017?
DeepSeek V4.1 Flash 1017 is cheaper: $0.262 versus $0.453 per million tokens blended at 3:1 input:output. Input alone: $0.270 vs $0.150. Output alone: $1.00 vs $0.600.
What context windows do DeepSeek V3.1 Terminus and DeepSeek V4.1 Flash 1017 have?
DeepSeek V3.1 Terminus: 163,840 tokens. DeepSeek V4.1 Flash 1017: 1,048,576 tokens.
Who makes DeepSeek V3.1 Terminus and DeepSeek V4.1 Flash 1017?
DeepSeek V3.1 Terminus is made by DeepSeek. DeepSeek V4.1 Flash 1017 is made by DeepSeek.
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