GPT-5.5 vs Grok 4 20 Non Reasoning
API pricing, context window and capabilities for GPT-5.5 and Grok 4 20 Non Reasoning, side by side. Prices are the cheapest serving route per 1M tokens, verified against LiteLLM and OpenRouter.
Verdict
computed from the published numbersGPT-5.5 wins on intelligence. Grok 4 20 Non Reasoning wins on price and on context window. Benchmark data is unavailable for one or both models.
Price
Grok 4 20 Non Reasoning
Coding
Not called
Intelligence
GPT-5.5
Context window
Grok 4 20 Non Reasoning
Key takeaways
who wins on what, from the published numbersGPT-5.5 wins
- More serving providers (2 vs 1)
- Has reasoning mode
- Supports prompt caching
Grok 4 20 Non Reasoning wins
- Cheaper input ($5.00 vs $2.00 /1M)
- Cheaper output ($30.00 vs $6.00 /1M)
- Larger context window (1.1M vs 2M)
- Higher max output (128K vs 2M)
Cheaper overall
Grok 4 20 Non Reasoning
$2.00 + $6.00 /1M
Larger context
Grok 4 20 Non Reasoning
2M
More providers
GPT-5.5
2 providers
Pricing & specs
cheapest serving route · per 1M tokens| GPT-5.5 | Grok 4 20 Non Reasoning | |
|---|---|---|
| Input $/1M | $5.00 | $2.00 best |
| Output $/1M | $30.00 | $6.00 best |
| Context window | 1.1M | 2M best |
| Max output | 128K | 2M best |
| Serving providers | 2 best | 1 |
| Released | 2026-04-23 | 2026-03-09 |
Benchmarks
Artificial Analysis indices, side by side| GPT-5.5 | Grok 4 20 Non Reasoning | |
|---|---|---|
| Intelligence | 54.8 best | 21.8 |
| Coding | 74.9 | Not available |
| GPQA Diamond | 94% best | 78% |
| Output speed | 87 t/s | 163 t/s best |
| Latency (TTFT) | 23.21s | 4.54s best |
Cost calculator
choose a serving route for each sideInput tokens / month
Output tokens / month
GPT-5.5
via Azure
$55
Grok 4 20 Non Reasoning
via Vertex AI
$16
Capabilities
feature support, side by side| Feature | GPT-5.5 | Grok 4 20 Non Reasoning |
|---|---|---|
| Vision | ✓ | ✓ |
| Tool use | ✓ | ✓ |
| Reasoning | ✓ | — |
| Audio | — | — |
| Prompt caching | ✓ | — |
| Structured output | ✓ | ✓ |
| Web search | ✓ | ✓ |
Related comparisons
Frequently asked questions
Which is cheaper, GPT-5.5 or Grok 4 20 Non Reasoning?
Grok 4 20 Non Reasoning is cheaper for input ($5.00 vs $2.00 per 1M tokens). Grok 4 20 Non Reasoning is cheaper for output ($30.00 vs $6.00 per 1M tokens).
What is the context window difference between GPT-5.5 and Grok 4 20 Non Reasoning?
GPT-5.5 has a 1.1M-token context window and Grok 4 20 Non Reasoning has 2M tokens, so Grok 4 20 Non Reasoning can take a larger prompt.
How do GPT-5.5 and Grok 4 20 Non Reasoning compare on benchmarks?
On the tracked Artificial Analysis indices, GPT-5.5 leads on intelligence.
Pricing verified against LiteLLM + OpenRouter + provider pages · refreshed daily
Every weekday
AI moves fast. Here's your debrief.
News, analysis, tools, and more.
For people who build with AI