Gemini 3.5 Flash vs GPT-5.6 Luna
GPT-5.6 Luna is ~87% cheaper than Gemini 3.5 Flash on output tokens. Both are capability tier 5. GPT-5.6 Luna has the larger context window.
| Gemini 3.5 Flash | GPT-5.6 Luna | |
|---|---|---|
| Vendor | OpenAI | |
| Capability tier | 5/8 | 5/8 |
| Size class | BALANCED | FAST |
| Parameters | — | — |
| Context window | 1,048,576 | 1,050,000 ✓ |
| Input $/M | $1.50 | $0.20 |
| Output $/M | $9 | $1.20 ✓ |
| Cached input $/M | $0.15 | $0.10 |
Which should you choose?
Both sit at capability tier 5, so GPT-5.6 Luna is usually the better value at ~87% 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 Gemini 3.5 Flash cheaper than GPT-5.6 Luna?
GPT-5.6 Luna is the cheaper of the two on output tokens ($1.20/M vs $9/M), about 87% less.
Gemini 3.5 Flash vs GPT-5.6 Luna: which has a bigger context window?
GPT-5.6 Luna has the larger context window (1,050,000 tokens).
Which is more capable, Gemini 3.5 Flash or GPT-5.6 Luna?
Both sit at the same capability tier (5/8) — pick on price, context, or benchmark them on your prompts.
Gemini 3.5 Flash or GPT-5.6 Luna: which should I use?
Both sit at capability tier 5, so GPT-5.6 Luna is usually the better value at ~87% 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 Gemini 3.5 Flash cost than GPT-5.6 Luna?
At 10M input + 10M output tokens per month, Gemini 3.5 Flash runs about $105.00 and GPT-5.6 Luna about $14.00 — a difference of $91.00 per month at that volume.
Settle it on your own prompts
List prices only go so far — benchmark Gemini 3.5 Flash and GPT-5.6 Luna 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.