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GPT-6 Luna is the fast, low-cost tier of OpenAI's GPT-6 series (1.05M-token context, text, image, and file input, $0.10/$0.50 per million input/output tokens), released September 22, 2026 below GPT-6 Sol and the flagship GPT-6 Astra. It is built for high-volume tasks with a clear goal, such as summarization, extraction, classification, quick questions, and lightweight agentic steps.
Image understanding#65Mathematical#67Software & IT Services#79Writing, Literature, & Language#86
AuthorOpenAI
Country🇺🇸 United States
ReleasedSep 22, 2026
Overview
Cost rate
0.1x
Context
1.1M
Input
Output
Reasoning
Tool calling
Structured outputs
Pricing/M tokens
Input$0.10
Cached input$0.01
Output$0.50
Context
Context length1,050,000
Max output tokens128,000
Knowledge cutoff-
Performance
Throughput-
Latency-
This is an alias that always points to Z.ai's latest GLM Flash model.
Software & IT Services#27Mathematical#29Medicine & Healthcare#33Image understanding#35
AuthorZ.AI
Country🇨🇳 China
ReleasedAug 27, 2026
Overview
Cost rate
0.1x
Context
1M
Input
Output
Reasoning
Tool calling
Structured outputs
Pricing/M tokens
Input$0.05
Cached input$0.01
Output$0.16
Context
Context length1,048,576
Max output tokens943,718
Knowledge cutoff-
Performance
Throughput78 tok/s
Latency2.51s
Benchmarks
Head-to-head scores across reasoning, coding, and agentic indices, plus per-domain rankings.
Intelligence
57.6
Claude Opus 5.5 (Max, Default Fallback)
Claude Opus 5.5 (Max, Default Fallback)56.0Claude Sonnet 5.5 (Max, Default Fallback)
Claude Sonnet 5.5 (Max, Default Fallback)53.4
