Best LLMs for Long-Context Reasoning — Google
The best Google model for reasoning over long inputs is Gemini 3.1 Pro Preview, scoring 72.7% on long-context reasoning — a different question from how large a window it accepts. Gemini 3.6 Flash (69.7%) and Gemini 3.5 Flash (69.3%) round out the top three.
- 1
gemini-3.1-pro-previewReasoningToolsJSON+246.5 intel · $2.00/M · 136 t/s72.7%LCR - 2gemini-3.6-flashReasoningToolsJSON+250.1 intel · $1.50/M · 135 t/s69.7%LCR
- 3gemini-3.5-flashReasoningToolsJSON+250.2 intel · $1.50/M · 270 t/s69.3%LCR
- 4gemini-2.5-proReasoningToolsJSON+225.8 intel · $1.25/M · 85 t/s66.0%LCR
- 5gemini-3.1-flash-liteReasoningToolsJSON+225.0 intel · $0.250/M · 135 t/s65.3%LCR
- 6gemini-3.1-flash-lite-previewReasoningToolsJSON+225.0 intel · $0.250/M · 337 t/s65.3%LCR
- 7gemini-3.5-flash-liteReasoningToolsJSON+236.5 intel · $0.300/M · 160 t/s62.0%LCR
- 8gemini-2.5-flashReasoningToolsJSON+214.1 intel · $0.300/M · 150 t/s45.9%LCR
- 9gemini-2.5-flash-liteReasoningToolsJSON+26.9 intel · $0.100/M · 107 t/s31.3%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 Google model reasons best over long inputs?
The best Google model for reasoning over long inputs is Gemini 3.1 Pro Preview, scoring 72.7% on long-context reasoning — a different question from how large a window it accepts. Gemini 3.6 Flash (69.7%) and Gemini 3.5 Flash (69.3%) round out the top three.
What's a good alternative to Gemini 3.1 Pro Preview?
Gemini 3.6 Flash (69.7%) is the closest alternative on this metric, followed by Gemini 3.5 Flash (69.3%). See the full ranking above for the tradeoffs.
How many Google models are there?
modelgrep tracks 30 Google models with live benchmarks, speed, latency and per-provider pricing, led on intelligence by Gemini 3.5 Flash. 9 of them qualify for this ranking.