Best LLMs for Instruction Following — SpaceXAI
The best SpaceXAI model for instruction following is Grok 4.3, satisfying 81.3% of IFBench's verifiable prompt constraints. Grok 4.20 (81.2%) is next.
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grok-4.3ReasoningToolsJSON+137.6 intel · $1.25/M · 95 t/s81.3%IFBench - 2grok-4.20ReasoningToolsJSON+137.0 intel · $1.25/M · 144 t/s81.2%IFBench
How this is ranked
AI models ranked by IFBench — how reliably a model obeys explicit, verifiable constraints in the prompt (format, length, inclusion and exclusion rules). High scores mean fewer retries and less prompt-wrangling in production, which often matters more than raw intelligence for pipelines.
Frequently asked
Which SpaceXAI model follows instructions most reliably?
The best SpaceXAI model for instruction following is Grok 4.3, satisfying 81.3% of IFBench's verifiable prompt constraints. Grok 4.20 (81.2%) is next.
What's a good alternative to Grok 4.3?
Grok 4.20 (81.2%) is the closest alternative on this metric. 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. 2 of them qualify for this ranking.