GPT-5.5 vs Grok 4.3
How GPT-5.5 (OpenAI) and Grok 4.3 (xAI) compare on price, context window and best-fit use case.
In short: GPT-5.5 is best for highest-stakes reasoning, complex agents, and frontier coding tasks where capability outweighs cost, while Grok 4.3 suits reasoning and agentic tasks needing current/real-time info and low output costs. On price it's $5.00 vs $1.25 ($0.20 cached) per 1M input tokens; on context, ~1.05M tokens (128K max output) vs 1M tokens.
Verdict
GPT-5.5 is the more capable pick (Bq score 95 vs 88). Choose Grok 4.3 if budget leads: its input price is $1.25 ($0.20 cached) per 1M vs $5.00.
| Spec | GPT-5.5 | Grok 4.3 |
|---|---|---|
| Developer | OpenAI | xAI |
| Context window | ~1.05M tokens (128K max output) | 1M tokens |
| Input price /1M | $5.00 | $1.25 ($0.20 cached) |
| Output price /1M | $30.00 | $2.50 |
| Modalities | text, image | text, image |
| Best for | Highest-stakes reasoning, complex agents, and frontier coding tasks where capability outweighs cost. | Reasoning and agentic tasks needing current/real-time info and low output costs. |
GPT-5.5
- State-of-the-art reasoning and agentic workflows
- 1M+ context window
- Strong coding and tool use
- Multimodal (text + image input)
Grok 4.3
- Very competitive output pricing
- Configurable reasoning effort
- Real-time X and web search integration
- 1M context