Grok 4.20 vs GPT-5.6 Luna
Rank, tier, score and price side by side, from our weekly rankings. Scores are editorial opinion based on public sources.
A
Grok 4.20
B
GPT-5.6 Luna
- ProviderxAIOpenAI
- Rank#56#39Higher rank
- TierAA
- Score75.481.4Higher score
- PriceAPI $1.25 input / $2.50 output per 1M tokens (prompts under 200K; $2.50 / $5 above); also via Grok app subscriptions$0.20 per 1M input tokens, $1.20 per 1M output tokens
- TaglineA model with native tool use and real-time search integration that is designed for rapid learning and weekly improvement.OpenAI's cost-optimized GPT-5.6 tier, repriced 80% lower in July 2026 for high-volume production workloads.
| Attribute | Grok 4.20 | GPT-5.6 Luna |
|---|---|---|
| Provider | xAI | OpenAI |
| Rank | #56 | #39Higher rank |
| Tier | A | A |
| Score | 75.4 | 81.4Higher score |
| Price | API $1.25 input / $2.50 output per 1M tokens (prompts under 200K; $2.50 / $5 above); also via Grok app subscriptions | $0.20 per 1M input tokens, $1.20 per 1M output tokens |
| Tagline | A model with native tool use and real-time search integration that is designed for rapid learning and weekly improvement. | OpenAI's cost-optimized GPT-5.6 tier, repriced 80% lower in July 2026 for high-volume production workloads. |