GPT-5.6 Luna vs Grok 4.7.
Verdict by category, tale of the tape, shared benchmarks only, and cost at three workloads — all from the tracked data.
Verdict by category
| Category | GPT-5.6 Luna | Grok 4.7 | Winner |
|---|---|---|---|
| League Score | 66.7 | 66.8 | Grok 4.7 |
| Coding (SWE-bench %) | — | — | — |
| Reasoning (GPQA %) | 92.3 | — | — |
| Context (tokens) | 1050000 | 500000 | GPT-5.6 Luna |
| Speed (tok/s) | — | 87.6 | — |
| Price (blended $/1M) | $0.45 | $3.00 | GPT-5.6 Luna (cheaper) |
Tale of the tape
| Spec | GPT-5.6 Luna | Grok 4.7 |
|---|---|---|
| Maker | OpenAI | xAI (SpaceXAI) |
| Released | Jul 9, 2026 | Sep 21, 2026 |
| League Score | 67 | 67 |
| Context | 1,050,000 tokens | 500,000 tokens |
| Max output | 128,000 | — |
| $/1M input | $0.20 | $2.00 |
| $/1M output | $1.20 | $6.00 |
| Weights | Closed | Closed |
| Speed | — | 87.6 t/s |
Head-to-head benchmarks (shared only)
| Benchmark | GPT-5.6 Luna | Grok 4.7 |
|---|---|---|
| LiveBench overall | 66.1 | 70.1 |
Cost at three workloads
| Workload | GPT-5.6 Luna | Grok 4.7 |
|---|---|---|
| Light — 1M in / 250K out | $0.50 | $3.50 |
| Standard — 10M in / 2.5M out | $5.00 | $35.00 |
| Long-context — 50M in / 5M out | $16.00 | $130.00 |
The pick
Pick GPT-5.6 Luna if you need the bigger context window; you want the lower running cost.
Pick Grok 4.7 if you want the higher overall League Score.
All figures from the model database — sources and dates on each model page. Cost your own workload or compare a different pair.
Frequently asked questions
Which is better overall, GPT-5.6 Luna or Grok 4.7?
On overall League Score they are effectively tied — GPT-5.6 Luna scores 67 and Grok 4.7 scores 67. The category verdicts on this page are where the real differences live.
Which is cheaper, GPT-5.6 Luna or Grok 4.7?
GPT-5.6 Luna is cheaper: $0.45 vs $3.00 blended per 1M tokens (3:1 input/output mix) — about 6.7x less per token.
Which has the bigger context window, GPT-5.6 Luna or Grok 4.7?
GPT-5.6 Luna, with 1.1M of context against 500K for Grok 4.7.
Are GPT-5.6 Luna and Grok 4.7 open source?
GPT-5.6 Luna is closed weights — API access only; Grok 4.7 is closed weights — API access only.