OpenAI's GPT-5.6 Sol and xAI's Grok 4.5 compared on specs, pricing, and capabilities — as configured in AI Crucible ensembles.
| Specification | GPT-5.6 Sol | Grok 4.5 |
|---|---|---|
| Provider | OpenAI | xAI |
| API model ID | gpt-5.6-sol | grok-4.5 |
| Description | OpenAI's flagship 'Sol' model for complex professional work, with 1M context and native multimodal intelligence. | xAI's most intelligent and fastest Grok model, built for coding and agentic work. |
| Context window | 1.05M tokens | 500K tokens |
| Max output tokens | 128,000 | 32,768 |
| Input cost ($/1M tokens) | $6.00 | $2.40 |
| Output cost ($/1M tokens) | $36.00 | $7.20 |
| Cache read cost ($/1M tokens) | $0.60 | $0.60 |
| Latency | medium | medium |
| Reasoning model | Yes | Yes |
| Vision (image input) | Yes | Yes |
| Tool use | Yes | Yes |
See all model comparisons, full model specifications, benchmark results, or model comparison articles.