Pyyan / Compare / Step 5 Preview vs GPT-6 Astra
Step 5 Preview vs GPT-6 Astra
2 of 5Language Models · verified 20 Sept 2026
Step 5 PreviewStepFuncurrent
GPT-6 AstraOpenAIcurrent| Specification | Step 5 Preview | GPT-6 Astra |
|---|---|---|
| Summary | A frontier tier score at a tenth of the frontier price. | Saturates three of the benchmarks it reports, and ships disabled for enterprise. |
| Context | 1M | 1.05M |
| Input ($/Mtok) | $1 | $10 |
| Output ($/Mtok) | $2.7 | $50 |
| Licence | Proprietary | Proprietary |
| Max output | Not published | 128K |
| Parameters | 600B total, 27B active | Not published |
| Released | 18 Sep 2026 | 3 Sep 2026 |
| Model ID | step-5-preview | gpt-6-astra |
| Category | Language Models | Language Models |
| Official | StepFun ↗ | — |
Highlighted rows are where these differ.
Step 5 Preview
- 600B total parameters with 27B active per token, text and images in
- 24th of 200 models on the Artificial Analysis intelligence index
- Listings disagree on context: 1M on StepFun's API and Artificial Analysis, 100K on some trackers
Best for cheap reasoning at volume.
GPT-6 Astra
- 97.6% on FrontierMath Tier 4, 99.9% on ARC-AGI-3 and 100% on ExploitBench
- Above 272K input tokens the whole request reprices: input and cache at 2x, output at 1.5x
- Rolls out to OpenAI's Daybreak cyber programme first, and arrives switched off for enterprise
Best for hard reasoning and computer use.