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

  1. GPT-6 LunaOpenAIRemove
  2. Universal-3.5 ProAssemblyAIRemove
  3. Gemini 2.5 Flash Preview (thinking)GoogleRemove
gpt-6-luna vs universal-3-5-pro vs gemini-2.5-flash-preview:thinking
AttributeGPT-6 Lunagpt-6-lunaUniversal-3.5 Prouniversal-3-5-proGemini 2.5 Flash Preview (thinking)gemini-2.5-flash-preview:thinking
Pricing
Input$0.10 / 1M— Not priced per input token$0.075 / 1M
Output$0.50 / 1M— Not priced per output token$1.75 / 1M
Cache Write (5m)$0.10 / 1MNot applicable$0.075 / 1M
Cache Write (1h)$0.10 / 1MNot applicable$0.075 / 1M
Cache Read$0.10 / 1MNot applicable$0.075 / 1M
Web Search$0 / 1M$0 / 1M$0 / 1M
Context
Max context1.1MN/A1.0M
Max outputN/AN/AN/A
Capabilities
VisionYesNoYes
Function CallingYesNoYes
JSON ModeYesNoYes
StreamingYesNoYes
Catalogue
ProviderOpenAIAssemblyAIGoogle
Categorychatvoicechat
Charge typePay As You GoPay As You GoPay As You Go
Released—2026-09-22—
Description
SummaryGPT-6 Luna is the fast, cost-efficient model in OpenAI's GPT-6 series, optimized for high-volume and latency-sensitive workloads such as chat, classification, and lightweight agentic tasks. It combines low-cost, responsive inference with the GPT-6 family’s improvements in factual reliability and clear, concise communication. At higher reasoning effort, GPT-6 Luna can also handle complex software engineering and computer-use workflows that previously required a Sol-tier model, making it a versatile choice for scalable production applications that need to balance speed, cost, and capability.AssemblyAI Universal-3.5 Pro speech-to-text. Billed per second of audio.Gemini 2.5 Flash Preview (May 2025) is Google's high-performance general model built for advanced reasoning, coding, math, and science. It includes built-in “thinking” features to deliver more accurate, context-aware answers.