CtrlAltDebrief

GLM 5.2 vs Mercury 2

API pricing, context window and capabilities for GLM 5.2 and Mercury 2, side by side. Prices are the cheapest listed serving route per 1M tokens, from LiteLLM and OpenRouter.

Verdict

computed from the published numbers

GLM 5.2 wins on Terminal-Bench, on intelligence and on context window.

Price
Tied
Terminal-Bench
GLM 5.2
Intelligence
GLM 5.2
Context window
GLM 5.2

Key takeaways

who wins on what, from the published numbers

GLM 5.2 wins

  • Cheaper input ($0.05 vs $0.25 /1M)
  • Larger context window (1M vs 128K)
  • Higher max output (1M vs 50K)
  • More serving providers (20 vs 3)
  • Supports vision
  • Has reasoning mode

Mercury 2 wins

  • Cheaper output ($1.98 vs $0.75 /1M)
Cheaper overall
Mercury 2
$0.25 + $0.75 /1M
Larger context
GLM 5.2
1M
More providers
GLM 5.2
20 providers

Pricing & specs

cheapest listed route · per 1M tokens
On-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 5.2Mercury 2
Input $/1M$0.05OpenRouter routed quote best$0.25via Inception
Output $/1M$1.98via Scx AI $0.75via Inception best
Context window1M best128K
Max output1M best50K
Serving providers20 best3
DateReleased Jun 13, 2026 Released Feb 24, 2026

Benchmarks

Benchmark scores, side by side
GLM 5.2Mercury 2
Intelligence33.7 best13.8
Terminal-Bench78% best27%
GPQA Diamond89% best77%
Output speed83 t/s 554 t/s best
Latency (TTFT)2.97s best6.83s

Cost calculator

choose a serving route for each side
Input tokens / month
Output tokens / month
GLM 5.2
via OpenRouter
$7.25
Mercury 2
via Inception
$2.00

Capabilities

feature support, side by side
FeatureGLM 5.2Mercury 2
Vision✓—
Tool use✓✓
Reasoning✓—
Audio——
Prompt caching✓✓
Structured output✓✓
Web search——

Related comparisons

Frequently asked questions

Which is cheaper, GLM 5.2 or Mercury 2?
GLM 5.2 is cheaper for input ($0.05 vs $0.25 per 1M tokens) as an OpenRouter routed quote. Mercury 2 is cheaper for output ($1.98 vs $0.75 per 1M tokens) from Inception.
What is the context window difference between GLM 5.2 and Mercury 2?
GLM 5.2 has a 1M-token context window and Mercury 2 has 128K tokens, so GLM 5.2 can take a larger prompt.
How do GLM 5.2 and Mercury 2 compare on benchmarks?
On the tracked benchmarks, GLM 5.2 leads on Terminal-Bench, and GLM 5.2 leads on intelligence.
Listed prices from LiteLLM, OpenRouter and Vercel · last checked Oct 14, 2026

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