Verdict
computed from the published numbersGLM 5.2 wins on price. GPT-5.5 wins on Terminal-Bench, on intelligence and on context window.
Price
GLM 5.2
Terminal-Bench
GPT-5.5
Intelligence
GPT-5.5
Context window
GPT-5.5
Key takeaways
who wins on what, from the published numbersGLM 5.2 wins
- Cheaper input ($0.05 vs $5.00 /1M)
- Cheaper output ($1.98 vs $30.00 /1M)
- Higher max output (1M vs 128K)
- More serving providers (20 vs 6)
GPT-5.5 wins
- Larger context window (1M vs 1.1M)
- Has web search
Cheaper overall
GLM 5.2
$0.05 + $1.98 /1M
Larger context
GPT-5.5
1.1M
More providers
GLM 5.2
20 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. An OpenRouter routed quote is the price of whichever upstream provider OpenRouter prefers today, so it moves day to day.
| GLM 5.2 | GPT-5.5 | |
|---|---|---|
| Input $/1M | $0.05OpenRouter routed quote best | $5.00via OpenAI |
| Output $/1M | $1.98via Scx AI best | $30.00via OpenAI |
| Context window | 1M | 1.1M best |
| Max output | 1M best | 128K |
| Serving providers | 20 best | 6 |
| Date | Released Jun 13, 2026 | Released Apr 23, 2026 |
Benchmarks
Benchmark scores, side by side| GLM 5.2 | GPT-5.5 | |
|---|---|---|
| Intelligence | 33.7 | 38.4 best |
| Terminal-Bench | 78% | 84% best |
| GPQA Diamond | 89% | 94% best |
| Output speed | 83 t/s | 102 t/s best |
| Latency (TTFT) | 2.97s best | 70.60s |
Cost calculator
choose a serving route for each sideInput tokens / month
Output tokens / month
GLM 5.2
via OpenRouter
$7.25
GPT-5.5
via OpenAI
$55
Capabilities
feature support, side by side| Feature | GLM 5.2 | GPT-5.5 |
|---|---|---|
| Vision | ✓ | ✓ |
| Tool use | ✓ | ✓ |
| Reasoning | ✓ | ✓ |
| Audio | — | — |
| Prompt caching | ✓ | ✓ |
| Structured output | ✓ | ✓ |
| Web search | — | ✓ |
Related comparisons
Frequently asked questions
Which is cheaper, GLM 5.2 or GPT-5.5?
GLM 5.2 is cheaper for input ($0.05 vs $5.00 per 1M tokens) as an OpenRouter routed quote. GLM 5.2 is cheaper for output ($1.98 vs $30.00 per 1M tokens) from Scx AI.
What is the context window difference between GLM 5.2 and GPT-5.5?
GLM 5.2 has a 1M-token context window and GPT-5.5 has 1.1M tokens, so GPT-5.5 can take a larger prompt.
How do GLM 5.2 and GPT-5.5 compare on benchmarks?
On the tracked benchmarks, GPT-5.5 leads on Terminal-Bench, and 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