Best LLMs for Long-Context Reasoning — DeepSeek
The best DeepSeek model for reasoning over long inputs is DeepSeek V4 Pro, scoring 66.3% on long-context reasoning — a different question from how large a window it accepts. DeepSeek V4 Flash 0731 (65.7%) and DeepSeek V4 Flash 0423 (65.7%) round out the top three.
- 1
deepseek-v4-proReasoningToolsJSON44.3 intel · $0.435/M · 67 t/s66.3%LCR - 2deepseek-v4-flash-0731ReasoningToolsJSON49.9 intel · $0.090/M · 82 t/s65.7%LCR
- 3deepseek-v4-flashReasoningToolsJSON49.9 intel · $0.140/M · 114 t/s65.7%LCR
- 4deepseek-r1ReasoningToolsJSON20.1 intel · $0.700/M · 22 t/s54.7%LCR
- 5deepseek-v3.1-terminusReasoningToolsJSON21.4 intel · $0.270/M · 164K ctx43.3%LCR
- 6deepseek-v3.2ReasoningToolsJSON24.7 intel · $0.269/M · 50 t/s39.0%LCR
- 7deepseek-r1-distill-llama-70bReasoning9.9 intel · $0.800/M · 23 t/s11.0%LCR
How this is ranked
AI models ranked by LCR — reasoning accuracy over long inputs, not just the size of the window they accept. A large context window is a capacity claim; this is the measurement of whether the model can still reason over information buried deep inside it. Pair it with the longest-context ranking, which sorts on raw window size.
Frequently asked
Which DeepSeek model reasons best over long inputs?
The best DeepSeek model for reasoning over long inputs is DeepSeek V4 Pro, scoring 66.3% on long-context reasoning — a different question from how large a window it accepts. DeepSeek V4 Flash 0731 (65.7%) and DeepSeek V4 Flash 0423 (65.7%) round out the top three.
What's a good alternative to DeepSeek V4 Pro?
DeepSeek V4 Flash 0731 (65.7%) is the closest alternative on this metric, followed by DeepSeek V4 Flash 0423 (65.7%). See the full ranking above for the tradeoffs.
How many DeepSeek models are there?
modelgrep tracks 12 DeepSeek models with live benchmarks, speed, latency and per-provider pricing, led on intelligence by DeepSeek V4 Flash 0731. 7 of them qualify for this ranking.