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xAI
Grok 4.1 Fast
xAI’s lower-cost Grok 4.1 fast tier for cheaper reasoning-oriented production traffic.
Overall score
87
fastbudget-reasoningtool-use
Context window
2M tokens
Speed
Fast
Input pricing
$0.20 / 1M input tokens ($0.05 cached)
Output pricing
$0.50 / 1M output tokens
Score breakdown
Capability84
Use-case fit88
Cost efficiency94
Speed94
Reliability85
Agent readiness89
Ecosystem84
Scores combine benchmark signals, product experience, and editorial weighting. Use them as a practical guide, not an absolute truth claim.
Best for
Agent automationResearch
Works with
xAI APIcost-aware reasoning flowstool-first assistants
Modalities
textimage
Sources & trust
Officially verified core fields
Official linkSummaryDescriptionModalitiesModality profileContext windowTool supportPricingPricing page
Editorial fields such as shortlist guidance, strengths, caveats, and scoring remain clearly separated from official provider data.
xAI official
Official site · Tier 5 · Apr 13, 2026
Official link
xAI models and pricing
Official docs · Tier 5 · Apr 13, 2026
SummaryDescriptionModalitiesModality profileContext windowTool supportPricingPricing page
Grok 4.1 Fast VerdictLens review
Manual review · Tier 3 · Apr 9, 2026
Best-fit guidanceWorks-with guidanceStrengthsCaveatsOverall scoreScore breakdown
Last verified: Apr 13, 2026
Strengths
- Much cheaper Grok-family entry point while keeping the same large context footprint.
- Useful for teams that want xAI coverage without paying flagship rates on every request.
Things to watch
- Lower ceiling than the flagship Grok 4.20 tier on hardest tasks.
- xAI platform conventions are still less standardized than older API ecosystems.
Best for
Research synthesis & analyst workflows
Prioritize source grounding, multilingual reading, long-context reasoning, and a retrieval stack that stays inspectable.
Agent automation & operations
Prioritize tool reliability, composability, secret handling, and robust state management across long-running flows.