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DeepSeek V4.1 Flash

API name deepseek-flash. 8B prefill / 16B decode active params; Codeforces 3471 (vendor). Price is DeepSeek's peak rate (cache hit $0.006); off-peak is 50% off.

Released
Sep 10, 2026
Price in / out
$0.3 / $1.2
Blended $/1M
$0.525
Context
1M
Parameters: 552B / 16B active. License: MIT.

Benchmark scoresvs DeepSeek V4 Pro

BenchmarkScoreRank (current)Source
Terminal-Bench 2.1
74.5%#9 of 22benchlm.ai ↗
GPQA Diamond
90.9%#10 of 21benchlm.ai ↗
Humanity's Last Exam
36.8%#21 of 31benchlm.ai ↗

DeepSeek versions

Timeline
Version$ in / outTerminal-BenchSWE-benchGPQAHLEARC-AGI-2τ²-bench
DeepSeek V3Retired$0.27 / $1.1—42%———22.8%
DeepSeek R1Superseded$0.55 / $2.19—49.2%———36.5%
DeepSeek V3.1Superseded$0.56 / $1.68—66%———34.8%
DeepSeek V3.2Superseded$0.28 / $0.42—————78.9%
DeepSeek V4 FlashRetired$0.14 / $0.2867%79%88.1%34.8%61.4%—
DeepSeek V4 Pro$1.32 / $3.9654.7%80.6%90.1%42.7%61.3%96.2%
DeepSeek V4.1 Flash$0.3 / $1.274.5%—90.9%36.8%——