Pyyan / Compare / Step 5 Preview vs GPT-6.1 Sol
Step 5 Preview vs GPT-6.1 Sol
2 of 5Language Models · verified 1 Oct 2026
Step 5 PreviewStepFuncurrent
GPT-6.1 SolOpenAIcurrent| Specification | Step 5 Preview | GPT-6.1 Sol |
|---|---|---|
| Summary | A frontier tier score at a tenth of the frontier price. | Astra's score on DeepSWE, at a fifth of Astra's cost. |
| Context | 1M | 1.05M |
| Input ($/Mtok) | $1 | $2 |
| Output ($/Mtok) | $2.7 | $10 |
| Licence | Proprietary | Proprietary |
| Max output | Not published | 128K |
| Parameters | 600B total, 27B active | Not published |
| Released | 18 Sep 2026 | 29 Sep 2026 |
| Model ID | step-5-preview | gpt-6.1-sol |
| Category | Language Models | Language Models |
| Official | StepFun ↗ | OpenAI ↗ |
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-6.1 Sol
- Matches GPT-6 Astra on DeepSWE v1.1 at roughly a fifth of the cost
- $5.47 per Terminal-Bench Science task against $23.80 for Astra
- Above 272K tokens a prompt bills at 2x input and 1.5x output for the whole request
Best for coding and agent work at volume.