Best LLMs for Long-Context Reasoning — SpaceXAI
The best SpaceXAI model for reasoning over long inputs is Grok 4.5, scoring 67.7% on long-context reasoning — a different question from how large a window it accepts. Grok 4.3 (64.3%) and Grok 4.20 (58.0%) round out the top three.
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grok-4.5ReasoningToolsJSON+153.8 intel · $2.00/M · 52 t/s67.7%LCR - 2grok-4.3ReasoningToolsJSON+137.6 intel · $1.25/M · 95 t/s64.3%LCR
- 3grok-4.20ReasoningToolsJSON+137.0 intel · $1.25/M · 144 t/s58.0%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 SpaceXAI model reasons best over long inputs?
The best SpaceXAI model for reasoning over long inputs is Grok 4.5, scoring 67.7% on long-context reasoning — a different question from how large a window it accepts. Grok 4.3 (64.3%) and Grok 4.20 (58.0%) round out the top three.
What's a good alternative to Grok 4.5?
Grok 4.3 (64.3%) is the closest alternative on this metric, followed by Grok 4.20 (58.0%). See the full ranking above for the tradeoffs.
How many SpaceXAI models are there?
modelgrep tracks 5 SpaceXAI models with live benchmarks, speed, latency and per-provider pricing, led on intelligence by Grok 4.5. 3 of them qualify for this ranking.