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GPT · canonical pair

GPT-5.6 Luna vs GPT-5.6 Sol

Alphabetical by model id, so this URL is the one to index. GPT-5.6 Luna is openai/gpt-5.6-luna. GPT-5.6 Sol is openai/gpt-5.6-sol. Both are among the models the most providers list, inside the GPT group.

A

GPT-5.6 Luna

$3.00

per month at the reference workload

  • Reasoning
  • Tool use
  • Structured output
  • Vision
  • Long context

vs

B

GPT-5.6 Sol

$54.00

per month at the reference workload

  • Reasoning
  • Tool use
  • Structured output
  • Vision
  • Long context
100 requests a day, 2,000 input tokens and 500 output tokens, no cache hits. A light chat workload so the rate cards are comparable.
SpecGPT-5.6 LunaGPT-5.6 Sol
Monthly, reference workload$3.00$54.00
Input / 1M$0.20$4.00
Output / 1M$1.20$20.00
Cache read / 1M$0.02$0.40
Cache write / 1M$0.25$5.00
Context1,050,0001,050,000
Max output128,000128,000
ReasoningYesYes
Tool callsYesYes
VisionYesYes
Open weightsNoNo
Providers4445
Released2026-07-092026-07-09

Same workload, your numbers

Prices are USD per 1M tokens. A month is 30 days. Cache hits use the cache-read rate when the model has one; otherwise the cache field is ignored.

GPT-5.6 Sol costs $51.00 more per month than GPT-5.6 Luna at these inputs.

monthly = requests/day × 30 × (input tokens × (1 − cache hit) × input price + input tokens × cache hit × cache-read price + output tokens × output price) ÷ 1,000,000