Compare / head-to-head
GPT-6 Lunavs
Step 5 Preview
GPT-6 Luna and Step 5 Preview do not yet share a public benchmark, so quality cannot be compared apples-to-apples. GPT-6 Luna is 6.2x cheaper per token. GPT-6 Luna has the larger context window (1.1M tokens).
Benchmarks from cited public sources; pricing from official pages; status from official provider feeds.
Shared benchmarks
0
no overlap yet
Cheaper per token
GPT-6 Luna
6.2x cheaper, input + output
Larger context
GPT-6 Luna
1.1M tokens
Providers
2 providers
OpenAI · StepFun
GPT-6 Luna
OpenAI · released 2026-09-22
textvision
Step 5 Preview
StepFun · released 2026-09-20
textvisionvideo
Quality
Benchmark matrix
0 shared · 1 only GPT-6 Luna · 0 only Step 5 Preview| Benchmark | GPT-6 Luna | Step 5 Preview | Δ | Edge |
|---|---|---|---|---|
| Reported by both · 0 | ||||
| No public benchmark is reported for both models yet. | ||||
| Only GPT-6 Luna reports · 1 | ||||
| DeepSWE v1.1 | 66.6% ↗ | not reported | — | — |
| Only Step 5 Preview reports · 0 | ||||
| Step 5 Preview reports nothing GPT-6 Luna does not. | ||||
Scores tagged "epoch" or "matharena" are independent runs, used only where the lab has not published its own; ⚠ marks rows MathArena flags as released after the competition. Higher is better on every row. Δ is GPT-6 Luna minus Step 5 Preview in the benchmark's own unit. "Not reported" means the lab has not published that figure; it is not a zero. ↗ opens the source.
Specs & pricing
Side by side
Official pricing pages and model cards| Spec | GPT-6 Luna | Step 5 Preview | Edge |
|---|---|---|---|
| Context window | 1.1M tokens | 1M tokens | GPT-6 Luna |
| Max output | 128K tokens | 64K tokens | GPT-6 Luna |
| Input price / 1M | $0.1 ↗ | $1 ↗ | GPT-6 Luna |
| Output price / 1M | $0.5 ↗ | $2.7 ↗ | GPT-6 Luna |
| Cached input / 1M | $0.01 ↗ | $0.05 ↗ | GPT-6 Luna |
| Input + output / 1M Lower is cheaper. List prices; batch, tool and regional fees excluded. | $0.6 | $3.7 | GPT-6 Luna |
| Modalities | text · vision | text · vision · video | Step 5 Preview |
| Released | 2026-09-22 | 2026-09-20 | — |
| Cited benchmark scores | 1 | 0 | — |
Reliability
Provider status
Live from /statusMore matchups
GPT-6 Luna vs …
Models sharing the most benchmarksBuilt by Respan
Which one wins on your data?
Public benchmarks are a starting point. Run GPT-6 Luna and Step 5 Preview on your own prompts with Respan evals, or route to either through one gateway key with automatic failover.