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OpenAI released three GPT-5.6 API tiers: Sol at $5/$30, Terra at $2.50/$15, and Luna at $1/$6 per 1M input/output tokens. All three expose large context windows and cached-input pricing at 10% of uncached input.
Benchmark each tier before changing routes. GPT-5.6 also changes prompt-cache write economics, while cache reads remain at a 90% discount.
| Field | Before | After |
|---|---|---|
| frontier | gpt-5.5 | gpt-5.6-sol |
| tiers | gpt-5.5, gpt-5.5-pro | gpt-5.6-sol, gpt-5.6-terra, gpt-5.6-luna |
| pricing | — | { "sol": [ 5, 30 ], "terra": [ 2.5, 15 ], "luna": [ 1, 6 ] } |
OpenAI lists Sol at $5/$30, Terra at $2.50/$15, and Luna at $1/$6 per 1M input/output tokens.
Check your models and usage for free. See the relevant official changes, estimated cost, and a practical next step.