Compare models
Grok 4.7 vs GPT-6.1 Sol
| Spec | Grok 4.7 | GPT-6.1 Sol |
|---|---|---|
| Developer | xAI (SpaceXAI) | OpenAI |
| Released | September 21, 2026 | September 29, 2026 |
| Status | Current | Current |
| Inputs | Text, Images | Text, Images |
| Context window | 500K tokens | 1.1M tokens |
| Input price / 1M tokens | $2 | $2 |
| Output price / 1M tokens | $6 | $10 |
| Open weights | No | No |
| Access | Grok app, X, xAI API | ChatGPT (paid plans), Codex, OpenAI API |
Grok 4.7 in brief
Grok 4.7 specs and pricing: xAI's September 2026 flagship with a 500K-token context, $2/$6 per million tokens under 200K (doubling above), and comparisons.
- Competitive pricing under 200K tokens
- 500K-token context
- Integration with X for real-time information
GPT-6.1 Sol in brief
GPT-6.1 Sol specs and pricing: OpenAI's September 2026 value model at $2/$10 per million tokens with a 1.05M-token context, and how it compares with Claude Sonnet 5.5.
- Near-flagship quality at $2/$10
- Cached input at $0.10 per million tokens
- About 1.05M-token context
Which should you choose?
Choose Grok 4.7 if you need: apps that benefit from x/real-time data; cost-conscious use with prompts under 200k tokens; grok app users.
Choose GPT-6.1 Sol if you need: production apps that need strong quality at scale; coding assistants and agents on a budget; high-volume document work.
For most teams the best test is your own workload: run the same 20–50 real prompts through both models and compare quality, speed and cost. Benchmarks published by labs use different settings and rarely match everyday use.
Frequently asked questions
Which is cheaper, Grok 4.7 or GPT-6.1 Sol?
At list prices, Grok 4.7 costs $2 per million input tokens and $6 per million output tokens, compared with $2 and $10 for GPT-6.1 Sol. Discounts for caching and batch processing can change the real cost.
Which has a bigger context window?
GPT-6.1 Sol can take in up to 1.1M tokens at once, versus 500K for Grok 4.7.
Are Grok 4.7 and GPT-6.1 Sol open source?
Grok 4.7 is closed: you use it through its developer’s apps or API. GPT-6.1 Sol is closed: you use it through its developer’s apps or API.
Which model is newer?
GPT-6.1 Sol was released later, on September 29, 2026.
Sources
- xAI models and pricing — xAI
- OpenAI API models — OpenAI
- OpenAI releases GPT-6.1 Sol at a fifth of GPT-6 Astra's token prices — The Next Web, September 29, 2026
Written by
Luka Kušec · Editor
Editor of SI.info. Writes about Super Intelligence, technology policy and the people building frontier models.