token.app › Compare › Grok 4.3 vs GPT-5.6 Luna
Grok 4.3 vs GPT-5.6 Luna
GPT-5.6 Luna is 6.9× cheaper per token on a blended 3:1 basis. GPT-5.6 Luna accepts the larger context window (1.1M).
Head to head
Blended price uses a 3:1 input:output mix
| Grok 4.3 | GPT-5.6 Luna | |
|---|---|---|
| Provider | xAI | OpenAI |
| Input $/1M | $1.25 | $0.100 |
| Output $/1M | $2.50 | $0.600 |
| Blended $/1M | $1.56 | $0.225 |
| Context window | 1M | 1.1M |
| Max output | — | 128K |
| Released | Apr 2026 | Jul 2026 |
| Licence | Proprietary | Proprietary |
Choose Grok 4.3 if…
- No clear advantage on the data we hold.
Choose GPT-5.6 Luna if…
- Costs less per token — $0.225 vs $1.56 blended
- Larger context window (1.1M)
- Newer model (released Jul 2026)
FAQ
Which is better, Grok 4.3 or GPT-5.6 Luna?
We do not hold independently-run benchmark scores covering both Grok 4.3 and GPT-5.6 Luna, so we make no quality claim. Their pricing and specifications are compared on this page.
Is Grok 4.3 cheaper than GPT-5.6 Luna?
GPT-5.6 Luna is cheaper: $0.225 versus $1.56 per million tokens blended at 3:1 input:output. Input alone: $1.25 vs $0.100. Output alone: $2.50 vs $0.600.
What context windows do Grok 4.3 and GPT-5.6 Luna have?
Grok 4.3: 1,000,000 tokens. GPT-5.6 Luna: 1,050,000 tokens.
Who makes Grok 4.3 and GPT-5.6 Luna?
Grok 4.3 is made by xAI. GPT-5.6 Luna is made by OpenAI.