Pyyan / Compare / Grok 4.20 Reasoning vs GPT-6.1 Sol
Grok 4.20 Reasoning vs GPT-6.1 Sol
2 of 5Language Models · verified 1 Oct 2026
Grok 4.20 ReasoningxAIcurrent
GPT-6.1 SolOpenAIcurrent| Specification | Grok 4.20 Reasoning | GPT-6.1 Sol |
|---|---|---|
| Summary | Agentic reasoning SKU. | Astra's score on DeepSWE, at a fifth of Astra's cost. |
| Context | 1M | 1.05M |
| Input ($/Mtok) | $1.25 | $2 |
| Output ($/Mtok) | $2.5 | $10 |
| Licence | Proprietary | Proprietary |
| Max output | — | 128K |
| Parameters | — | Not published |
| Released | — | 29 Sep 2026 |
| Model ID | grok-4.20-0309-reasoning | gpt-6.1-sol |
| Category | Language Models | Language Models |
| Official | xAI ↗ | OpenAI ↗ |
Highlighted rows are where these differ.
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.