GPT-5.5 vs Grok 4
Grok 4 leads in 4 of 8 categories
Arena ELO
Grok 4
Cheaper
Tie
Faster
Grok 4
Detailed Comparison
| Category | GPT-5.5 | Grok 4 |
|---|---|---|
| Provider | OpenAI | xAI |
| Context Window | 128K | 256K WIN |
| Input Price ($/1M) | $5 | $5 |
| Output Price ($/1M) | $30 | $25 WIN |
| Arena ELO | N/A | 1330 WIN |
| Coding | N/A | unknown |
| Reasoning | N/A | unknown |
| Speed (tokens/sec) | N/A | ~45 t/s WIN |
| Open Source | No | No |
Frequently Asked Questions
Which is cheaper, GPT-5.5 or Grok 4?
Grok 4 is approximately 14% cheaper than GPT-5.5 per million tokens.
Which is better for coding, GPT-5.5 or Grok 4?
GPT-5.5 scores N/A on coding benchmarks, while Grok 4 scores unknown.
Which has a larger context window?
GPT-5.5 supports 128K context, while Grok 4 supports 256K.
Is GPT-5.5 or Grok 4 open source?
GPT-5.5 is proprietary. Grok 4 is proprietary.
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