$ diff gpt-5-6-sol grok-4-5
GPT-5.6 Sol vs Grok 4.5
OpenAI and xAI, side by side. Every value below is the one recorded on the model’s own wiki page, with its citation — nothing is estimated.
OpenAIGPT-5.6 Sol
- context
- 1.1M
- weights
- closed
- $/M in
- $5
- $/M out
- $30
- context
- 500K
- weights
- —
- $/M in
- $2
- $/M out
- $6
What actually differs
- Context window
- GPT-5.6 Sol takes 1.1M against 500K — 2.1× more room in a single request.
- Input price
- Grok 4.5 at $2/M against $5/M — 2.5× cheaper to feed.
- Output price
- Grok 4.5 at $6/M against $30/M — 5.0× cheaper to generate. Output dominates the bill on most agentic workloads, where the model writes far more than it reads.
Full spec
| Attribute | GPT-5.6 Sol | Grok 4.5 |
|---|---|---|
| Developer | OpenAI | xAI |
| Released | 2026-07-09 | 2026-07-09 |
| Context window | 1.05M tokens | 500K tokens |
| Pricing | $5/M input · $30/M output (Sol; family tiers below) | $2/M input · $6/M output |
| License | proprietary (API-only; no weight release) | not recorded |
| Availability | ChatGPT (subscription), API | Grok Build (default model), Cursor (all plans), SpaceXAI console/API; not in EU (regulatory review pending as of 2026-07-09) |
Values come from GPT-5.6 Sol and Grok 4.5, where each is cited to its source. This page states no benchmark result and ranks neither model — it puts two published specifications next to each other. Where a lab has not published a figure, the row says so rather than guessing. How these pages are produced.