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 listed serving route per 1M tokens, from 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
Terminal-Bench
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 (6 vs 5)
Grok 4 20 Non Reasoning wins
- Cheaper input ($5.00 vs $1.25 /1M)
- Cheaper output ($30.00 vs $2.50 /1M)
- Larger context window (1.1M vs 2M)
- Higher max output (128K vs 2M)
Cheaper overall
Grok 4 20 Non Reasoning
$1.25 + $2.50 /1M
Larger context
Grok 4 20 Non Reasoning
2M
More providers
GPT-5.5
6 providers
Pricing & specs
cheapest listed route · per 1M tokensOn-demand listed rates, OpenRouter routed quotes and Vercel reseller quotes. Enterprise commitments can be materially lower.
| GPT-5.5 | Grok 4 20 Non Reasoning | |
|---|---|---|
| Input $/1M | $5.00via OpenAI | $1.25via xAI best |
| Output $/1M | $30.00via OpenAI | $2.50via xAI best |
| Context window | 1.1M | 2M best |
| Max output | 128K | 2M best |
| Serving providers | 6 best | 5 |
| Date | Released Apr 23, 2026 | Released Mar 9, 2026 |
Benchmarks
Benchmark scores, side by side| GPT-5.5 | Grok 4 20 Non Reasoning | |
|---|---|---|
| Intelligence | 38.4 best | 14.2 |
| Terminal-Bench | 84% | Not available |
| GPQA Diamond | 94% best | 78% |
| Output speed | 102 t/s best | 94 t/s |
| Latency (TTFT) | 70.60s | 0.62s best |
Cost calculator
choose a serving route for each sideInput tokens / month
Output tokens / month
GPT-5.5
via OpenAI
$55
Grok 4 20 Non Reasoning
via Azure
$8.75
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 $1.25 per 1M tokens) from xAI. Grok 4 20 Non Reasoning is cheaper for output ($30.00 vs $2.50 per 1M tokens) from xAI.
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 benchmarks, GPT-5.5 leads on intelligence.
Listed prices from LiteLLM, OpenRouter and Vercel · last checked Oct 14, 2026
Every weekday
AI moves fast. Here's your debrief.
News, analysis, tools, and more.
For people who build with AI