GPT-5.6 Terra vs GPT-5.6 Luna
Side-by-side comparison of API pricing, specs, benchmarks, and capabilities
GPT-5.6 Luna is 60% cheaper on blended cost ($3.50 vs $8.75/Mtok) — note: different model classes (mid tier vs flagship)
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Oby OpenAI
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Oby OpenAI
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|---|---|---|
| Overview | ||
| Status | Current flagship | Current mid tier |
| Released | Jul 9, 2026 | Jul 9, 2026 |
| Pricing per million tokens | ||
| Input | $2.50/Mtok | $1.00/Mtok |
| Output | $15.00/Mtok | $6.00/Mtok |
| Blended avg | $8.75/Mtok | $3.50/Mtok |
| Cached input | $0.250/Mtok | $0.100/Mtok |
| Specifications | ||
| Context window | 1M tokens | 1M tokens |
| Parameters | Proprietary | Proprietary |
| Speed (TPS) | — | — |
| Modalities | ||
| Input |
textimage
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textimage
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| Providers | ||
| Available from |
OpenAI — $2.50/$15.00/Mtok
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OpenAI — $1.00/$6.00/Mtok
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Cost at scale — 1M tokens (50/50 input/output)
| Volume | GPT-5.6 Terra | GPT-5.6 Luna | Savings |
|---|---|---|---|
| 1M tokens | $8.75 | $3.5 | $5.25 (60%) |
| 10M tokens | $87.5 | $35 | $52.5 (60%) |
| 100M tokens | $875 | $350 | $525 (60%) |
| 1000M tokens | $8750 | $3500 | $5250 (60%) |
Try GPT-5.6 Luna on OpenAI
The cheaper option here — GPT-5.6 Luna costs $3.50/Mtok blended on OpenAI.
Summary
GPT-5.6 Terra by OpenAI costs $2.50/Mtok input and $15.00/Mtok output, with a 1M-token context window. It supports text, image input.
GPT-5.6 Luna by OpenAI costs $1.00/Mtok input and $6.00/Mtok output, with a 1M-token context window. It supports text, image input.
On a blended cost basis, GPT-5.6 Luna is 60% cheaper than GPT-5.6 Terra.
Note: Pricing is per million tokens. Actual costs vary with usage patterns, prompt caching, and batch discounts. Always verify against official provider pricing pages.