token.app › Compare › Qwen3.5 397B A17B vs DeepSeek V4 Flash 0731

Qwen3.5 397B A17B vs DeepSeek V4 Flash 0731

DeepSeek V4 Flash 0731 leads on 3 of 3 shared benchmarks. DeepSeek V4 Flash 0731 is 1.9× cheaper per token on a blended 3:1 basis. DeepSeek V4 Flash 0731 accepts the larger context window (1.0M).

Head to head
Blended price uses a 3:1 input:output mix
Qwen3.5 397B A17BDeepSeek V4 Flash 0731
ProviderAlibabaDeepSeek
Input $/1M$0.500$0.440
Output $/1M$3.60$1.32
Blended $/1M$1.27$0.660
Context window262K1.0M
Max output236K131K
ReleasedFeb 2026Jul 2026
LicenceOpen weightsOpen weights
GPQA Diamond 86.4% 91.0%
FrontierMath T1–3 31.2% 57.5%
OTIS Mock AIME 88.9% 94.4%
Benchmark scores independently run and published by Epoch AI, 'AI Benchmarking Hub', used under CC BY 4.0. Only benchmarks with a score for BOTH models are compared.
Choose Qwen3.5 397B A17B if…
  • No clear advantage on the data we hold.
Choose DeepSeek V4 Flash 0731 if…
  • Costs less per token — $0.660 vs $1.27 blended
  • Higher GPQA Diamond (91.0% vs 86.4%)
  • Higher FrontierMath T1–3 (57.5% vs 31.2%)
  • Higher OTIS Mock AIME (94.4% vs 88.9%)
  • Larger context window (1.0M)
  • Newer model (released Jul 2026)
FAQ
Which is better, Qwen3.5 397B A17B or DeepSeek V4 Flash 0731?
Across the 3 benchmarks both models have independently-run scores for, Qwen3.5 397B A17B leads on 0 and DeepSeek V4 Flash 0731 leads on 3. Benchmarks are one input — price and context window are on this page too.
Is Qwen3.5 397B A17B cheaper than DeepSeek V4 Flash 0731?
DeepSeek V4 Flash 0731 is cheaper: $0.660 versus $1.27 per million tokens blended at 3:1 input:output. Input alone: $0.500 vs $0.440. Output alone: $3.60 vs $1.32.
What context windows do Qwen3.5 397B A17B and DeepSeek V4 Flash 0731 have?
Qwen3.5 397B A17B: 262,144 tokens. DeepSeek V4 Flash 0731: 1,048,576 tokens.
Who makes Qwen3.5 397B A17B and DeepSeek V4 Flash 0731?
Qwen3.5 397B A17B is made by Alibaba. DeepSeek V4 Flash 0731 is made by DeepSeek.
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