GPT-5.6 Luna vs o3
GPT-5.6 Luna is ~85% cheaper than o3 on output tokens. Both are capability tier 5. GPT-5.6 Luna has the larger context window.
| GPT-5.6 Luna | o3 | |
|---|---|---|
| Vendor | OpenAI | OpenAI |
| Capability tier | 5/8 | 5/8 |
| Size class | FAST | BALANCED |
| Parameters | — | 200B |
| Context window | 1,050,000 ✓ | 200,000 |
| Input $/M | $0.20 | $2 |
| Output $/M | $1.20 ✓ | $8 |
| Cached input $/M | $0.10 | $0.50 |
Which should you choose?
Both sit at capability tier 5, so GPT-5.6 Luna is usually the better value at ~85% lower output cost, and it also carries the larger 1,050,000-token context window. Because they're the same tier, benchmark both on your own prompts before committing — list price rarely predicts task quality.
FAQ
Is GPT-5.6 Luna cheaper than o3?
GPT-5.6 Luna is the cheaper of the two on output tokens ($1.20/M vs $8/M), about 85% less.
GPT-5.6 Luna vs o3: which has a bigger context window?
GPT-5.6 Luna has the larger context window (1,050,000 tokens).
Which is more capable, GPT-5.6 Luna or o3?
Both sit at the same capability tier (5/8) — pick on price, context, or benchmark them on your prompts.
GPT-5.6 Luna or o3: which should I use?
Both sit at capability tier 5, so GPT-5.6 Luna is usually the better value at ~85% lower output cost, and it also carries the larger 1,050,000-token context window. Because they're the same tier, benchmark both on your own prompts before committing — list price rarely predicts task quality.
How much more does GPT-5.6 Luna cost than o3?
At 10M input + 10M output tokens per month, GPT-5.6 Luna runs about $14.00 and o3 about $100.00 — a difference of $86.00 per month at that volume.
Settle it on your own prompts
List prices only go so far — benchmark GPT-5.6 Luna and o3 on your actual workload for measured cost, latency and quality.
Pricing and specs maintained by Mintok's catalog watchers from public sources. Not investment advice. Methodology.