Verdict
computed from the published numbersGLM 5.1 wins on intelligence and on context window. Mercury 2 wins on price. Benchmark data is unavailable for one or both models.
Price
Mercury 2
Coding
Not called
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 (203K vs 128K)
- Higher max output (128K vs 50K)
- More serving providers (2 vs 1)
- Has reasoning mode
Mercury 2 wins
- Cheaper input ($1.05 vs $0.25 /1M)
- Cheaper output ($3.50 vs $0.75 /1M)
- Supports structured output
Cheaper overall
Mercury 2
$0.25 + $0.75 /1M
Larger context
GLM 5.1
203K
More providers
GLM 5.1
2 providers
Pricing & specs
cheapest serving route · per 1M tokens| GLM 5.1 | Mercury 2 | |
|---|---|---|
| Input $/1M | $1.05 | $0.25 best |
| Output $/1M | $3.50 | $0.75 best |
| Context window | 203K best | 128K |
| Max output | 128K best | 50K |
| Serving providers | 2 best | 1 |
| Released | 2026-04-07 | 2026-02-24 |
Benchmarks
Artificial Analysis indices, side by side| GLM 5.1 | Mercury 2 | |
|---|---|---|
| Intelligence | 40.2 best | 25.3 |
| Coding | 55.8 | Not available |
| GPQA Diamond | 87% best | 77% |
| Output speed | 91 t/s | 602 t/s best |
| Latency (TTFT) | 10.49s | 2.73s best |
Cost calculator
choose a serving route for each sideInput tokens / month
Output tokens / month
GLM 5.1
via OpenRouter
$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). Mercury 2 is cheaper for output ($3.50 vs $0.75 per 1M tokens).
What is the context window difference between GLM 5.1 and Mercury 2?
GLM 5.1 has a 203K-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 Artificial Analysis indices, GLM 5.1 leads on intelligence.
Pricing verified against LiteLLM + OpenRouter + provider pages · refreshed daily
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