Comparison · AI Models & LLMs
GPT-6 Luna vs GPT-6 Astra
The same method as our rankings: scores from the engine, sourced data, verified prices.
Details: GPT-6 Astra →Details: GPT-6 Luna →
GPT-6 Astra
OpenAI
Full sheet →- Context window
- 1.05M tokens
- Maximum output
- 128k tokens
- Input cost per 1M tokens
- $10.00
- Output cost per 1M tokens
- $50.00
GPT-6 Luna
OpenAI
Full sheet →- Context window
- 1.05M tokens
- Maximum output
- 128k tokens
- Input cost per 1M tokens
- $0.10
- Output cost per 1M tokens
- $0.50
The numbers side by side
Each bar is the product's verified figure; on every row the longer bar is the higher of the two values.
- Context windowhigher is better
- Maximum outputhigher is better
- Input cost per 1M tokenslower is better
- Cached input cost per 1M tokenslower is better
- Output cost per 1M tokenslower is better
Who wins where
- Cheaper to readGPT-6 LunaInput cost per 1M tokens
- Cheaper to writeGPT-6 LunaOutput cost per 1M tokens
- Fresher knowledgeGPT-6 LunaKnowledge cutoff
Data sheet side by side
Memory and answer length
Context window1.05M tokens1.05M tokens
Maximum output128k tokens128k tokens
API prices
Input cost per 1M tokens$10.00✓$0.1099% less
Cached input cost per 1M tokens$1.00✓$0.0199% less
Output cost per 1M tokens$50.00✓$0.5099% less
Knowledge and abilities
Knowledge cutoffApril 2026✓May 2026
Reads imagesYesYes
Calls tools and functionsYesYes
What a month costs
Change the volumes: the cost is worked out from the verified list prices above.
GPT-6 Astra$45.00per month · $540 per year
GPT-6 Luna$0.45per month · $5.40 per yearThe cheaper one — you save $44.55 per month
The scenarios are only starting points to edit, not data about your use. List prices without discounts, time-of-day rates or taxes.
Questions and answers
Cheaper to read: GPT-6 Astra or GPT-6 Luna?
GPT-6 Luna: $0.10 against $10.00 (Input cost per 1M tokens).
Cheaper to write: GPT-6 Astra or GPT-6 Luna?
GPT-6 Luna: $0.50 against $50.00 (Output cost per 1M tokens).
Fresher knowledge: GPT-6 Astra or GPT-6 Luna?
GPT-6 Luna: May 2026 against April 2026 (Knowledge cutoff).