Verdict
computed from the published numbersGLM 5.1 wins on Terminal-Bench, on intelligence and on context window. Mercury 2 wins on price.
Price
Mercury 2
Terminal-Bench
GLM 5.1
Intelligence
GLM 5.1
Context window
GLM 5.1
Key takeaways
who wins on what, from the published numbersGLM 5.1 wins
- Larger context window (205K vs 128K)
- Higher max output (203K vs 50K)
- More serving providers (12 vs 3)
- Has reasoning mode
Mercury 2 wins
- Cheaper input ($1.05 vs $0.25 /1M)
- Cheaper output ($3.50 vs $0.75 /1M)
Cheaper overall
Mercury 2
$0.25 + $0.75 /1M
Larger context
GLM 5.1
205K
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.
| GLM 5.1 | Mercury 2 | |
|---|---|---|
| Input $/1M | $1.05via DeepInfra | $0.25via Inception best |
| Output $/1M | $3.50via DeepInfra | $0.75via Inception best |
| Context window | 205K best | 128K |
| Max output | 203K best | 50K |
| Serving providers | 12 best | 3 |
| Date | Released Apr 7, 2026 | Released Feb 24, 2026 |
Benchmarks
Benchmark scores, side by side| GLM 5.1 | Mercury 2 | |
|---|---|---|
| Intelligence | 26.1 best | 13.8 |
| Terminal-Bench | 62% best | 27% |
| GPQA Diamond | 87% best | 77% |
| Output speed | 66 t/s | 554 t/s best |
| Latency (TTFT) | 1.71s best | 6.83s |
Cost calculator
choose a serving route for each sideInput tokens / month
Output tokens / month
GLM 5.1
via DeepInfra
$8.75
Mercury 2
via Inception
$2.00
Capabilities
feature support, side by side| Feature | GLM 5.1 | Mercury 2 |
|---|---|---|
| Vision | — | — |
| Tool use | ✓ | ✓ |
| Reasoning | ✓ | — |
| Audio | — | — |
| Prompt caching | ✓ | ✓ |
| Structured output | ✓ | ✓ |
| Web search | — | — |
Related comparisons
Frequently asked questions
Which is cheaper, GLM 5.1 or Mercury 2?
Mercury 2 is cheaper for input ($1.05 vs $0.25 per 1M tokens) from Inception. Mercury 2 is cheaper for output ($3.50 vs $0.75 per 1M tokens) from Inception.
What is the context window difference between GLM 5.1 and Mercury 2?
GLM 5.1 has a 205K-token context window and Mercury 2 has 128K tokens, so GLM 5.1 can take a larger prompt.
How do GLM 5.1 and Mercury 2 compare on benchmarks?
On the tracked benchmarks, GLM 5.1 leads on Terminal-Bench, and GLM 5.1 leads on intelligence.
Listed prices from LiteLLM, OpenRouter and Vercel · last checked Oct 14, 2026
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