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Compare models

Put up to 4 models beside each other — token prices, context windows, capabilities and provider, from the same catalogue the model pages read.

  1. Universal-3.5 ProAssemblyAIRemove
  2. GPT-6 Luna ProOpenAIRemove
  3. Grok 4.20 BetaxAIRemove
universal-3-5-pro vs gpt-6-luna-pro vs grok-4.20-beta
AttributeUniversal-3.5 Prouniversal-3-5-proGPT-6 Luna Progpt-6-luna-proGrok 4.20 Betagrok-4.20-beta
Pricing
Input— Not priced per input token$0.10 / 1M$2.00 / 1M
Output— Not priced per output token$0.50 / 1M$6.00 / 1M
Cache Write (5m)Not applicable$0.10 / 1M$2.00 / 1M
Cache Write (1h)Not applicable$0.10 / 1M$2.00 / 1M
Cache ReadNot applicable$0.10 / 1M$2.00 / 1M
Web Search$0 / 1M$0 / 1M$0 / 1M
Context
Max contextN/A1.1M2M
Max outputN/AN/AN/A
Capabilities
VisionNoYesYes
Function CallingNoYesYes
JSON ModeNoYesYes
StreamingNoYesYes
Catalogue
ProviderAssemblyAIOpenAIxAI
Categoryvoicechatchat
Charge typePay As You GoPay As You GoPay As You Go
Released2026-09-22——
Description
SummaryAssemblyAI Universal-3.5 Pro speech-to-text. Billed per second of audio.GPT-6 Luna Pro uses the same underlying model as GPT-6 Luna, but runs with reasoning.mode set to pro for higher-quality responses on complex tasks. It combines Luna's speed and cost efficiency with deeper reasoning and more reliable multi-step execution, making it well suited for advanced coding, computer use, and agentic workflows where higher solution quality is needed without moving to a larger GPT-6 tier.Grok 4.20 Beta is xAI's newest flagship model, designed for high-performance reasoning with industry-leading speed and strong agentic tool-calling capabilities. It emphasizes strict prompt adherence and low hallucination rates, enabling highly reliable and precise responses across complex tasks. Optimized for agent workflows and real-time applications, Grok 4.20 Beta delivers consistent, truthful outputs while maintaining fast inference and strong task execution reliability.