GPT-5.6 Terra vs GPT-5.6 Luna
GPT-5.6 Luna costs less on both: $0.12 in and $0.72 out per million tokens, against $1.20 in and $3.60 out for GPT-5.6 Terra. Both on one key at UplinkSwitch, each next to its developer's list price.
Prices · per million tokens, USD
| Tokens | GPT-5.6 Terragpt-5.6-terra | GPT-5.6 Lunagpt-5.6-luna |
|---|---|---|
| Input | $1.20OpenAI lists $2.00 · 40% under | $0.12OpenAI lists $0.20 · 40% under |
| Cached input | $0.12OpenAI lists $0.20 · 40% under | $0.012OpenAI lists $0.02 · 40% under |
| Output | $3.60OpenAI lists $12.00 · 70% under | $0.72OpenAI lists $1.20 · 40% under |
| Context window | 1,050,000 tokens | 1,050,000 tokens |
| Max output | 128,000 tokens | 128,000 tokens |
| Input | text, image | text, image |
| Released | 2026-07-09 | 2026-07-09 |
| Formats | OpenAI SDK | OpenAI SDK |
| Developer | OpenAI | OpenAI |
List price: each developer's published rate, read October 2026. A model with no cached rate bills cached tokens at its input rate. Live from GET https://api.uplinkswitch.com/v1/catalog.
What the same work costs · USD, here and at list
| Work | GPT-5.6 Terra | GPT-5.6 Luna |
|---|---|---|
| 1,000 chat requests | $4.20list $10.00 | $0.60list $1.00 |
| 100 long documents | $6.72list $12.40 | $0.744list $1.24 |
| A month of both, daily | $327.60list $672.00 | $40.32list $67.20 |
A chat request is 2,000 input and 500 output tokens; a long document is 50,000 in and 2,000 out; the month is 1,000 chats and 100 documents a day for 30 days, uncached. Over that month GPT-5.6 Luna costs $287.28 less here.
Same key, same URL
One base URL and one key serve both models. The request below calls GPT-5.6 Terra; put gpt-5.6-luna in the model field to call GPT-5.6 Luna instead.
shell
curl https://api.uplinkswitch.com/v1/chat/completions \
-H "authorization: Bearer sk-uplink-live-..." \
-H "content-type: application/json" \
-d '{"model":"gpt-5.6-terra","messages":[{"role":"user","content":"Hello"}]}'Model pages: GPT-5.6 Terra, GPT-5.6 Luna. Pricing by family: GPT. More comparisons: GPT-5.6 Sol vs GPT-5.6 Terra, Grok 4.5 vs GPT-5.6 Terra.
Questions
- Which costs less, GPT-5.6 Terra or GPT-5.6 Luna?
- GPT-5.6 Luna costs less on both: $0.12 in and $0.72 out per million tokens, against $1.20 in and $3.60 out for GPT-5.6 Terra.
- Can I switch between them by changing the model id?
- Yes. Both answer in the OpenAI SDK format at the same base URL with the same key. Change the model id from gpt-5.6-terra to gpt-5.6-luna and nothing else.
- Is there a subscription?
- No. Prepaid credit from $10, with no subscription or monthly fee. Each top-up locks your prices for 30 days.
- Is GPT-5.6 Terra better than GPT-5.6 Luna?
- Better depends on the job; this page compares what the catalog can measure. GPT-5.6 Luna costs less on both: $0.12 in and $0.72 out per million tokens, against $1.20 in and $3.60 out for GPT-5.6 Terra. Both take 1,050,000 tokens of context. Both run on the same key, so the fair test is your own prompt sent to each model id.