Gemini 3.1 Pro Preview vs GLM 5.1
API pricing, context window and capabilities for Gemini 3.1 Pro Preview and GLM 5.1, side by side. Prices are the cheapest listed serving route per 1M tokens, from LiteLLM and OpenRouter.
Verdict
computed from the published numbersGemini 3.1 Pro Preview wins on Terminal-Bench, on intelligence and on context window. GLM 5.1 wins on price.
Price
GLM 5.1
Terminal-Bench
Gemini 3.1 Pro Preview
Intelligence
Gemini 3.1 Pro Preview
Context window
Gemini 3.1 Pro Preview
Key takeaways
who wins on what, from the published numbersGemini 3.1 Pro Preview wins
- Larger context window (1M vs 205K)
- Supports vision
- Supports audio
- Has web search
GLM 5.1 wins
- Cheaper input ($2.00 vs $1.05 /1M)
- Cheaper output ($12.00 vs $3.50 /1M)
- Higher max output (66K vs 203K)
- More serving providers (6 vs 12)
Cheaper overall
GLM 5.1
$1.05 + $3.50 /1M
Larger context
Gemini 3.1 Pro Preview
1M
More providers
GLM 5.1
12 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.
| Gemini 3.1 Pro Preview | GLM 5.1 | |
|---|---|---|
| Input $/1M | $2.00via Google | $1.05via DeepInfra best |
| Output $/1M | $12.00via Google | $3.50via DeepInfra best |
| Context window | 1M best | 205K |
| Max output | 66K | 203K best |
| Serving providers | 6 | 12 best |
| Date | Released Feb 19, 2026 | Released Apr 7, 2026 |
Benchmarks
Benchmark scores, side by side| Gemini 3.1 Pro Preview | GLM 5.1 | |
|---|---|---|
| Intelligence | 29.7 best | 26.1 |
| Terminal-Bench | 74% best | 62% |
| GPQA Diamond | 94% best | 87% |
| Output speed | 140 t/s best | 66 t/s |
| Latency (TTFT) | 26.52s | 1.71s best |
Cost calculator
choose a serving route for each sideInput tokens / month
Output tokens / month
Gemini 3.1 Pro Preview
via Google
$22
GLM 5.1
via DeepInfra
$8.75
Capabilities
feature support, side by side| Feature | Gemini 3.1 Pro Preview | GLM 5.1 |
|---|---|---|
| Vision | ✓ | — |
| Tool use | ✓ | ✓ |
| Reasoning | ✓ | ✓ |
| Audio | ✓ | — |
| Prompt caching | ✓ | ✓ |
| Structured output | ✓ | ✓ |
| Web search | ✓ | — |
Related comparisons
Frequently asked questions
Which is cheaper, Gemini 3.1 Pro Preview or GLM 5.1?
GLM 5.1 is cheaper for input ($2.00 vs $1.05 per 1M tokens) from DeepInfra. GLM 5.1 is cheaper for output ($12.00 vs $3.50 per 1M tokens) from DeepInfra.
What is the context window difference between Gemini 3.1 Pro Preview and GLM 5.1?
Gemini 3.1 Pro Preview has a 1M-token context window and GLM 5.1 has 205K tokens, so Gemini 3.1 Pro Preview can take a larger prompt.
How do Gemini 3.1 Pro Preview and GLM 5.1 compare on benchmarks?
On the tracked benchmarks, Gemini 3.1 Pro Preview leads on Terminal-Bench, and Gemini 3.1 Pro Preview leads on intelligence.
Listed prices from LiteLLM, OpenRouter and Vercel · last checked Oct 14, 2026
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